Comtech EF Data SNM-1001 User Manual

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MULTIMEDIA INTEGRATED DIGITAL ACCESS SYSTEM

SNM-1001

Network Control Modem

eration and Maintenance Manual

Part Number MN/SNM1001.OM Revision 1

Comtech EFData is an ISO 9001

Registered Company.

SNM-1001

Network Control Modem

Operation and Maintenance Manual

Part Number MN/SNM1001.OM

Revision 1

May 31, 1999

Comtech EFData, 2114 West 7th Street, Tempe, Arizona 85281 USA, (480) 333-2200, FAX: (480) 333-2161.

Customer Support

Contact the Comtech EFData Customer Support Department for:

• Product support or training

• Information on upgrading or returning a product

• Reporting comments or suggestions concerning manuals

A Customer Support representative may be reached at:

Comtech EFData Attention: Customer Support Department 2114 West 7th Street Tempe, Arizona 85281 USA

(480) 333-2200 (Main Comtech EFData Number) (480) 333-4357 (Customer Support Desk) (480) 333-2161 FAX

or, E-Mail can be sent to the Customer Support Department at:

service@comtechefdata.com

1. To return a Comtech EFData product (in-warranty and out-of-warranty) for repair or replacement:

2. Request a Return Material Authorization (RMA) number from the Comtech EFData Customer Support Department.

3. Be prepared to supply the Customer Support representative with the model number, serial number, and a description of the problem.

4. To ensure that the product is not damaged during shipping, pack the product in its original shipping carton /p ack ag ing .

5. Ship the product back to Comtech EFData. (Shipping charges should be prepaid.)

For more information regarding the warranty policies, see Warranty Policy, p. ix.

ii Rev. 1

CHAPTER 1. INTRODUCTION........................................................................................1–1

1.1 Overview........................................................................................................................................................... 1–1

1.2 Mode of Operation........................................................................................................................................... 1–2

1.2.1 Description................................................................................................................................................ 1–4

1.3 Options .............................................................................................................................................................. 1–4

1.4 Specifications.................................................................................................................................................... 1–5

CHAPTER 2. INSTALLATION.........................................................................................2–1

2.1 Unpacking......................................................................................................................................................... 2–1

2.2 System Installation........................................................................................................................................... 2–2

2.3 External Modem Connectors.......................................................................................................................... 2–4

2.3.1 DATA I/O Interface (J8)........................................................................................................................... 2–4

2.3.1.1 EIA-422/449 Interface Connector Pinouts........................................................................................2–5

2.3.2 Remote (J6)............................................................................................................................................... 2–6

2.3.3 Faults (J7).................................................................................................................................................. 2–7

2.3.4 TX IF Output (CP1).................................................................................................................................. 2–7

2.3.5 RX IF Input (CP2)..................................................................................................................................... 2–8

2.3.6 AC Power.................................................................................................................................................. 2–8

2.3.7 DC Power.................................................................................................................................................. 2–8

2.3.8 Chassis GND............................................................................................................... .............................. 2–8

2.3.9 AGC Test Point......................................................................................................................................... 2–8

Rev. 1 iii

Preface SNM-1001 Network Control Modem

CHAPTER 3. OPERATION..............................................................................................3–1

3.1 Front Panel....................................................................................................................................................... 3–1

3.1.1 LED Indicator............................................................................................................................................ 3–2

3.1.2 Front Panel Keypad Option....................................................................................................................... 3–2

3.2 Clocking Options.............................................................................................................................................. 3–2

CHAPTER 4. THEORY OF OPERATION........................................................................4–1

4.1 Modulator......................................................................................................................................................... 4–1

4.1.1 Specifications............................................................................................................................................ 4–3

4.1.2 Theory of Operation .................................................................................................................................. 4–3

4.2 Demodulator..................................................................................................................................................... 4–5

4.2.1 Specifications............................................................................................................................................ 4–6

4.2.2 Theory of Operation .................................................................................................................................. 4–6

4.2.3 Viterbi Decoding Theory .......................................................................................................................... 4–7

4.3 Monitor and Control ....................................................................................................................................... 4–9

4.3.1 Non-Volatile Memory............................................................................................................................... 4–9

4.3.2 Remote Interface Specification............................................................................................ ..................... 4–10

4.3.3 M&C Theory of Operation........................................................................................................................ 4–10

4.3.4 Remote Interface Configuration................................................................................................................ 4–10

4.3.5 Modem Defaults........................................................................................................................................ 4–10

4.4 Digital Interfaces.............................................................................................................................................. 4–12

4.4.1 EIA-422/449 Interface............................................................................................................................... 4–12

4.4.1.1 Functional Description..................................................................................................................... 4–12

4.4.1.2 Specification..................................................................................................................................... 4–14

CHAPTER 5. MAINTENANCE.........................................................................................5–1

5.1 System Checkout.............................................................................................................................................. 5–1

5.1.1 Modulator Checkout.................................................................................................................................. 5–2

5.1.2 Demodulator Checkout ............................................................................................................................. 5–3

5.1.3 Test Points................................................................................................................................................. 5–6

5.1.3.1 Modulator Test Points...................................................................................................................... 5–6

5.1.3.2 Demod/M&C/Interface Test Points.................................................................................................. 5–7

5.2 Fault Isolation ..................................................................................................................................................5–8

5.2.1 Modulator Faults....................................................................................................................................... 5–10

5.2.1.1 Continuous Mode............................................................................................................................. 5–10

5.2.2 Demodulator Faults................................................................................................................................... 5–11

5.2.2.1 Burst Mode....................................................................................................................................... 5–11

5.2.3 Transmit Interface Faults .......................................................................................................................... 5–11

5.2.4 Receive Interface Faults............................................................................................................................ 5–11

5.2.4.1 Burst Mode....................................................................................................................................... 5–11

5.2.5 Common Equipment Faults....................................................................................................................... 5–12

5.3 Module Identification ...................................................................................................................................... 5–13

iv Rev. 1

SNM-1001 Network Control Modem Preface

5.4 Software Versions............................................................................................................................................ 5–13

5.5 Repackaging Requirements for Shipment..................................................................................................... 5–14

APPENDIX A. REMOTE CONTROL OPERATION ..........................................................A–1

A.1 General......................................................................................................................................................... A–2

A.2 Message Structure....................................................................................................................................... A–3

A.2.1 Start Character........................................................................................................................................... A–3

A.2.2 Device Address......................................................................................................................................... A–3

A.2.3 Command/Response.................................................................................................................................. A–4

A.2.4 End Character............................................................................................................................................ A–4

A.3 Configuration Commands/Responses........................................................................................................ A–5

A.3.1 Modulator.................................................................................................................................................. A–5

A.3.2 Demodulator.............................................................................................................................................. A–7

A.3.3 Interface .................................................................................................................................................... A–9

A.3.4 System....................................................................................................................................................... A–13

A.3.5 AUPC........................................................................................................................................................ A–13

A.4 Status Commands/Responses ..................................................................................................................... A–15

A.4.1 Configuration............................................................................................................................................ A–15

A.4.2 Error Performance..................................................................................................................................... A–31

A.5 Stored Faults................................................................................................................................................ A–32

Rev. 1 v

Preface SNM-1001 Network Control Modem

Figures

Figure 1-1. SNM-1001 Network Control Modem................................................................................................. 1–1

Figure 1-2. Typical NMS Configuration................................................................................................................ 1–3

Figure 1-3. Typical Network Control Channel Configuration ...............................................................................1–3

Figure 1-4. SNM-1001 Block Diagram................................................................................................................. 1–4

Figure 1-5. SNM-1001 Acquisition Performance ................................................................................................. 1–8

Figure 1-6. SNM-1001 Bit Error Rate Performance (Burst Mode)....................................................................... 1–9

Figure 2-1. Typical Rack Elevation....................................................................................................................... 2–3

Figure 2-2. Chassis Dimensional Drawing............................................................................................................ 2–3

Figure 2-3. SNM-1001 Rear Panel View .............................................................................................................. 2–4

Figure 3-1. SNM-1001 Front Panel View............................................................................................................. 3–1

Figure 4-1. Modulator Block Diagram.................................................................................................................. 4–2

Figure 4-2. Demodulator Block Diagram Burst Mode.......................................................................................... 4–5

Figure 4-3. Viterbi Decoder Block Diagram ......................................................................................................... 4–8

Figure 4-4. EIA-422/449 Diagram........................................................................................................................ 4–13

Figure 5-1. Typical Output Spectrum.................................................................................................................... 5–2

Figure 5-2. Typical Output Spectrum Noise......................................................................................................... 5–4

Figure 5-3. Typical Eye Constellations................................................................................................................. 5–5

Figure 5-4. SNM-1001 Fault Tree (Burst Mode).................................................................................................. 5–8

Figure 5-5. SNM-1001 Fault Tree (Continuous Mode)......................................................................................... 5–9

Tables

Table 1-1. Burst Mode Specifications................................................................................................................... 1–5

Table 1-2. Continuous Mode Specifications......................................................................................................... 1–6

Table 1-3. Burst Mode BER Specifications.......................................................................................................... 1–7

Table 2-1. Rear Panel Connectors ......................................................................................................................... 2–4

Table 4-1. M&C Jumper Settings (AS/4973)........................................................................................................ 4–2

Table 5-1. Adaptive Broadband Part Numbers for Various Modules ................................................................... 5–13

vi Rev. 1

SNM-1001 Network Control Modem Preface

About this Manual

This manual provides installat ion and operat ion info rmation for the Adaptive Broadband SNM-1001 Network Control Modem. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the SNM-1001 Network Control Modem.

Conventions and References

Cautions and Warnings

CAUTION indicates a hazardous situation that, if not avoided, may result in minor or moderate injury. CAUTION may also be used to indicate other

CAUTION

unsafe practices or risks of property damage.

WARNING

Metric Conversion

Metric conversion information is located on the inside back cover of this manual. This information is provided to assist the operator in cross-referencing English to Metric conversions. these references apply to the MIL-STD-188-114A electrical characteristics for a balanced voltage digital interface circuit, Type 1 generator, for the full range of data rates. For more information, refer to the Department of Defense (DOD) MIL-STD-188-114A, “Electrical Characteristics of Digital Interface Circuits.”

Trademarks

Products names mentioned in this manual may be trademarks or registered trademarks of their respective companies and are hereby acknowledged.

WARNING indicates a potentially hazardous situation that, if not avoided, could result in death or serious injury.

Rev. 1 vii

Preface SNM-1001 Network Control Modem

Reporting Comments or Suggestions Concerning this Manual

Comments and suggestions regarding the content and design of this manual will be appreciated. To submit comments, please contact the Comtech EFData Customer Support Department.

European EMC Directive

In order to meet the European Electro-Magnetic Compatibility (EMC) Directive (EN55022, EN50082-1), properly shielded cables for DATA I/O are required. More specifically, these cables must be shielded from end-to-end, ensuring a continuous ground shield.

The following information is applicable for the European Low Voltage Directive (EN60950):

<HAR> Type of power cord required for use in the European Community.

CAUTION: Double-pole/Neutral Fusing

International Symbols:

Note:

For additional symbols, refer to “Cautions and Warnings” listed earlier in this

preface.

ACHTUNG: Zweipolige bzw. Neutralleiter-Sicherung

Alternating Current.

Fuse. Safety Ground.

Chassis Ground.

viii Rev. 1

SNM-1001 Network Control Modem Preface

Warranty Policy

This Comtech EFData product is warranted against defects in material and workmanship for a period of one year from the date of shipment. During the warranty period, Comtech EFData will, at its option, repair or replace products that prove to be defective.

For equipment under warranty, the customer is responsible for freight to Comtech EFData and all related custom, taxes, tariffs, insurance, etc. Comtech EFData is responsible for the freight charges the customer. Comtech EFData will return the equipment by the same method (i.e., Air, Express, Surface) as the equipment was sent to Comtech EFData.

only

for return of the equipment from the factory to

Limitations of Warranty

The foregoing warranty shall not apply to defects resulting from improper installation or maintenance, abuse, unauthorized modification, or operation outside of environmental specifications for the product, or, for damages that occur due to improper repackag ing of equipment for return to Comtech EFData.

No other warranty is expressed or implied. Comtech EFData specifically disclaims the implied warranties of merchantability and fitness for particular purpose.

Exclusive Remedies

The remedies provided herein are the buyer's sole and exclusive remedies. Comtech EFData shall not be liable for any direct, indirect, special, incidental, or consequential damages, whether based on contract, tort, or any other legal theory.

Disclaimer

Comtech EFData has reviewed this manual thoroughly in order that it will be an easy-touse guide to your equipment. All statements, technical information, and recommendations in this manual and in any guides or related documents are believed reliable, but the accuracy and completeness thereof are not guaranteed or warranted, and they are not intended to be, nor should they be understood to be, representations or warranties concerning the products described. Further, Comtech EFData reserves the right to make changes in the specifications of the products described in this manual at any time without notice and without obligation to notify any person of such changes.

If you have any questions regarding your equipment or the information in this manual, please contact the Comtech EFData Customer Support Department.

Rev. 1 ix

Preface SNM-1001 Network Control Modem

This page has been intentionally left blank.

x Rev. 1

This chapter describes the SNM-1001 network control modem, referred to in this manual as “the modem”.

1.1 Overview

The SNM-1001 Network Control Modem (Figure 1-1) is a fully integrated, digital satellite network channel modem.

Chapter 1.

INTRODUCTION

Figure 1-1. SNM-1001 Network Control Modem

Rev. 1 1–1

Introduction SNM-1001 Network Control Modem

Using digital signal processing techniques, it functions as the network control channel modem for Comtech EFData’s Bandwidth-on-Demand (BOD) Multimedia Integrated Digital Access System (MIDAS).

Features of the SNM-1001 include the following:

• Fully integrated master control mode functionality

• 19.2 kbit/s, QPSK, 1/2 rate burst mode demodulator

• 19.2 kbit/s, QPSK, 1/2 rate continuous mode modulator

• Operational parameters stored in EEPROM

• 50/180 MHz operation

1.2 Mode of Operation

The SNM-1001 is an integral component of the MIDAS Network Management System (NMS), providing the control channel communication path between the NMS and the remote nodes.

The NMS transmits commands to the remote nodes through the SNM-1001, using a continuous, TDM, outbound carrier. The remote nodes send requests and status messages to the NMS using the slotted ALOHA burst inbound channel. This inbound channel technology allows multiple remote nodes to share a single inbound carrier.

A typical NMS configuration is shown in Figure 1-2. A typical network control channel configuration is shown in Figure 1-3.

1–2 Rev. 1

SNM-1001 Network Control Modem Introduction

)

NETWORK CONTROL MODEM

OPERATOR

WORKSTATION

OPTIONAL PRINTER

(USER SUPPLIED)

ETHERNET

NMS

CONTROLLER

EIA-422 EIA-232

EIA-232

(SNM-1001)

SNM -1001 Network Control Modem

TRANSMIT

TRAN SMIT

RECEIVE

SDT -1200

COMMON

SATELLITE TERMIN AL

STORED

LinkSync MODEM

(SNM-1002)

ENTER

CLEAR

POWER ON

ENTER

TRANSMITTER ON

CARRIE R DET ECT

CLEAR

TEST MODE

(50-180 MHz)

RFT

Figure 1-2. Typical NMS Configuration

BURST CONTINUOUS

NMS SITE

(SNM-1001)

TDMA INBOUND TDN OUTBOUND

REMOTE 3

(SNM-1010)

REMOTE 1 (SNM-1000)

REMOTE 2 (SNM-1000)

Figure 1-3. Typical Network Control Channel Configuration

REMOTE 4 (SNT-1020

Rev. 1 1–3

Introduction SNM-1001 Network Control Modem

1.2.1 Description

The SNM-1001 is a complete, self-contained unit in a standard 1 Unit (1U) 19” (48.26 cm) rack-mountable enclosure weighing approximately 10 lbs. (8.63 kg.)

All Monitor and Control (M&C) functions and indicators for operation of the modem, as well as the display Printed Circuit Board (PCB), are located on the front panel.

The chassis contains the power supply; a fan is located on the rear panel.

A system block diagram is shown in Figure 1-4.

SNM-1001

CUSTOMER

DATA I/O

EXT. CLOCK

ALARMS FORM C CONTACTS

REMOTE SERIAL INTERFACE

NETWORK CONTROL MODEM

INTERFACE

DISPL AY AND

COMMAND BUS

M&C

KEYPAD

DATA

CLK SCT

DATA CLK

ENCODER/ MODULATOR

M&C

POWER SUPPLY

M&C

DEMOD/

DECODER

IF OUTPUT

CP1

50 TO 90 MHz 100 TO 180 MHz

-5 TO -30 dBm

90 TO 264 VAC, 47 TO 63 Hz

IF INPUT

CP2

50 TO 90 MHz 100 TO 180 MHz

-30 TO -55 dBm

TRANSMIT

EQUIPMENT

RECEIVE

EQUIPMENT

ANTENNA

FRONT PANEL REMOTE (OPT.)

Figure 1-4. SNM-1001 Block Diagram

1.3 Options

The following option is available for the SNM-1001:

• ± 48 VDC power

1–4 Rev. 1

SNM-1001 Network Control Modem Introduction

1.4 Specifications

Table 1-1 and Table 1-2 list the operating specifications of the modem in Burst mode and Continuous mode, respectively.

Table 1-1. Burst Mode Specifications

General Specifications

Operating Frequenc y Range 50 to 180 MHz, synthesiz e d in 100 H z st e ps Type of D e modulation QPSK Operating Channel Spacing Less than 0.5 dB degradation operating with 2 adjacent-like

channels, each 10 dB higher at 1.3 times the symbol rate, or

a minimum of 1.2 times the speci f i e d ac quis ition ra ng e Bit Error Rate See Table 1-3 Digital Interfac e EIA-422/449 on 37-pin D

Digital Data Rate:

QPSK, 1/2 Rate 19.2 kbit/s Doppler Buffer N/A Forward Error Correc tion Convolutional encoding with s oft decision, K=7 Viterbi

decoding. Data Descrambling Selectable or none, 215-1, synchronous Prime Power 90 to 264 VAC auto select, 47 to 63 H z , 50W maxim um,

fused at 2A Size 1.75” H x 19.0” W x 20.1” D ( 4.44 H x 48.26 W x 51.0 D

cm) (see Figure 2-2)

Operating Temperature

Storage Temperature Humidity 0 to 95% noncondensing Diagnostic Feature s IF Loopback

Additional Demodulator Specifications

Input Power (Desired Ca r rie r ) -30 to -55 dBm (com posite )

Input Impedance 75Ω standard Input Return Loss 20 dB Carrier Acquis ition Ra ng e Clock Acquisition Ra ng e Acquisition Tim e < 30 ms Directed Sweep N/A

0° to 55°C (32° to 131° F)

-55° to +70°C (-131° to 158° F)

RF Loopback

Baseband Loopback (bi-directional, elect ric a l)

Fault Monitoring

Bit Error Rate Monitoring

Remote Control via Serial Port

+30 dB power within 2 MH z from desired c a rr ie r

+40 dB power outside of 2 MHz from de s ir ed c a r ri e r

– 5 dBm maximum composite

4 kHz minim um

100 PPM

Rev. 1 1–5

Introduction SNM-1001 Network Control Modem

Table 1-2. Continuous Mode Specifications

General Specifications

Operating Frequenc y Range 50 to 180 MHz, synthesiz e d in 100 H z st e ps Type of Modula tion QPSK Operating Channel Spacing Less than 0.5 dB degradation operating with 2 adjacent-like

channels, each 10 dB higher at 1.3 times the symbol rate, or a

minimum of 1.2 times the spec ified acquisition range Phase Noise In accordance with IESS-308 Digital Interface (Field Changeable Plug-in Modules ) One Interface per Module) Digital Data Rates:

QPSK, 1/2 Rate 19.2 kbit/s

Doppler Buffer Program mable from 64 to 65536 bits , or from 1 to 50 ms

Forward Error Correc tion Convolutional encoding with s oft decision K=7 Viterbi

Data Scrambling CCITT V.35 Prime Power 90 to 264 VAC auto select, 47 to 63 H z , 50W maxim um,

Size 1.75” H x 19.0” W x 20.1” D ( 4.44 H x 48.26 W x 51.0 D

Operating Temperature

Storage Temperature Humidity 0 to 95% noncondensing Diagnostic Feature s IF Loopback

Additional Modulator Specifications

Output Power -5 to -30 dBm, adjustable in 0.1 dB st e ps Output Spurious and Harmonic s -55 dBc in 4 kHz BW in- ba nd (50 to 180 MH z )

Output Impedance 75Ω standard Output Return Loss 20 dB Output Frequency Stability Data Clock Source Internal or external

Internal Data Clock Stability

EIA-422/449 on 37-pin D

total depth

decoding, Sequential decoding

fused at 2A

cm) (see Figure 2-2)

0° to 55°C (32° to 131° F)

-55° to +70°C (-131° to 158° F)

RF Loopback

Baseband Loopback (bi-directional, elect ric a l)

Fault Monitoring

Bit Error Rate Monitoring

Remote Control via Serial Port

-55 dBc in 4 kHz BW out- of-band (0 to 500 MHz)

10 PPM

External clock

10 PPM

100 PPM and < 5% jitter

1–6 Rev. 1

SNM-1001 Network Control Modem Introduction

Remote Control Specifications

Serial Interface EIA-232, baud rate is19,200 bit/s. Signals Controlled/Monitored Transmit Frequency

Receive Frequency Transmit Power Transmitter ON/OFF IF Loopback RF Loopback Baseband Loopba c k Scrambler ON/OFF Descrambler ON/OFF Sweep Center Filter Mask Raw Error Rate Corrected Bit Error Rate Receive E

b/N0

TX Clock Internal/External RX Clock Normal/Invert Receive Signal Level Receive Carrier Detect Power Supply Voltage s Fault Status Stored Fault Status

Configuration Retention Will maintain current config uration for at least one ye ar without

power

Addressing Programmable to 1 of 255 possibilitie s

Address 0 res e rved for global addr e s s ing

The Bit Energy-to-Noise Ratio (Eb/N0) required to achieve 10-6 to 10-9 bit error rate in Burst mode is listed in Table 1-3.

Table 1-3. Burst Mode BER Specifications

Eb/N

6 dB 6.4 8 dB 1.1

BER PER ACQ

-4

6.3

9.1

-2

-3

93% 99%

Notes:

1. Burst mode performance is measured with a 100 byte packet.

2. BER values are measured with a packet long enough to allow 100 errors.

Rev. 1 1–7

Introduction SNM-1001 Network Control Modem

Acquisition performance of the modem is shown in Figure 1-5.

Figure 1-5. SNM-1001 Acquisition Performance

1–8 Rev. 1

SNM-1001 Network Control Modem Introduction

The Bit Error Rate (BER) performance of the modem in Burst mode is shown in Figure 1-6.

-1

-2

-3

BER

-4

BER

-5

-6

-7

-8

3.0 4.0 5.0 6.0

BER

7.0 8.0 9.0 10.0 11.0

(dB)

b/N0

Figure 1-6. SNM-1001 Bit Error Rate Performance (Burst Mode)

Rev. 1 1–9

Introduction SNM-1001 Network Control Modem

This page is intentionally left blank.

1–10 Rev. 1

This chapter contains the following information:

• Unpacking

• Installation

• System options

• External connections

2.1 Unpacking

The modem and manual are packaged in a pre-formed, reusable cardboard carton containing foam spacing for maximum shipping protection.

Chapter 2.

INSTALLATION

The circuit cards are contained in the modem chassis.

Do not use any cutting tool that will extend more than 1” (2.54cm) into the container and cause damage to the modem.

CAUTION

To remove the modem:

1. Cut the tape at the top of the carton where it is indicated OPEN THIS END.

2. Lift out the cardboard/foam spacer covering the modem.

3. Remove the modem, manual, and power cord from carton.

Rev. 1 2–1

Installation SNM-1001 Network Control Modem

4. Save the packing material for reshipment purposes.

5. Inspect the equipment for damage incurred during shipment.

6. Check the equipment against the packing list to ensure that the shipment is complete.

2.2 System Installation

To install the modem:

1. Mount the modem chassis in the assigned position in the equipment rack. Refer to Figure 2-1 for a typical rack elevation for an M:N system. For a custom rack installation, refer to the chassis dimensional drawing in Figure 2-2.

Connect the cables to the appropriate locations on the rear panel. Section 2.3 contains a description of connector pinouts, placements, and functions.

Before turning on the power switch, read and become familiar with Chapter 3. Verify that all jumper settings are correctly set for remote operation. Jumper settings are listed in Table 4-1.

Turn on the power switch, located on the rear panel.

Check for proper TX output signal level and spectrum.

Check for proper RX input signal level and spectrum.

If there is any problem with the installation, refer to Chapter 5 for instructions on how to troubleshoot the system.

2–2 Rev. 1

SNM-1001 Network Control Modem Installation

SNM -1001 Network

Figure 2-1. Typical Rack Elevation

19.0

(48.26)

1.75 (4.5)

S N M -1001 N etw ork C ontrol M odem

20.10 (51.0)

1.25

(3.17)

Figure 2-2. Chassis Dimensional Drawing

Rev. 1 2–3

Installation SNM-1001 Network Control Modem

2.3 External Modem Connectors

Connections between the modem and other equipment are made through five connectors. These connectors are listed in Table 2-1 and their locations are shown in Figure 2-3. The use of each connector is described in the following paragraphs.

Table 2-1. Rear Panel Connectors

Name Ref. Design Function Connector Type

AC POWER None AC Power Input Standard DATA I/O J8 DATA Input/Output ( I/O )

EIA-422/449 AGC None AGC Test Point Test Point FAULTS J7 FORM-C Fault Relay Contacts 9-pin Female D REMOTE J6 Remote Interf a ce 9-pin Female D TX IF OUTPUT CP1 TX IF Output BNC RX IF INPUT CP2 RX IF Input BNC CHASSIS GND None Chassis Ground #10-32 Stud

Various 37-pin D

Figure 2-3. SNM-1001 Rear Panel View

2.3.1 DATA I/O Interface (J8)

The DATA I/O interface connector is used to interface data input and output signals to and from the modem. J8 connects to the customer terrestrial equipment directly, or through a protection switch. The modem operates with a single interface configuration. The DATA I/O interface is EIA-422/449.

2–4 Rev. 1

SNM-1001 Network Control Modem Installation

2.3.1.1 EIA-422/449 Interface Connector Pinouts

The EIA-422/449 interface is provided on a 37-pin female D connector accessible on the rear panel of the modem. Screw locks are provided for mechanical security of the mating connector.

Signal Function Name Pin #

Send Data SD-A

SD-B

Send Timing ST-A

ST-B

Receive Data RD-A

RD-B

Request to Send EIA-A

EIA-B

Receiver Timing RT-A

RT-B

Clear to Send CS-A

CS-B

Data Mode DM-A

DM-B

Receiver Ready RR-A

RR-B

Terminal Timing TT-A

TT-B

Master Clock (input) MC-A

MC-B Demod Fault – 21 Mod Fault – 3 Signal Ground SG 1, 19, 20, 37

(See Note) (See Note)

9 27 11 29 13 31 17 35 16 34

Note:

The EIA and CS lines are jumpered together on the demod/M&C card

(AS/4973-2), since the modem does not support polled operation.

Rev. 1 2–5

Installation SNM-1001 Network Control Modem

2.3.2 Remote (J6)

The remote connector allows the user to interface the Monitor and Control (M&C) functions with a remote location. This interface is EIA-232-C. For further discussion on the remote interface, refer to Chapter 4.

The remote interface is provided on a 9-pin female D connector. Screw locks are provided for mechanical security of the mating connector.

The remote connector is a Data Circuit Terminating Equipment (DCE) interface.

There are jumpers that must be set on the demodulator board to select the EIA-232-C remote interface. Refer to Chapter 4 for their location and configuration information.

EIA-232-C

4-Wire and 2-Wire Mode

Pin # Name

1 2RD (RX) 3TD (TX) 4 5GND 6DSR 7RTS 8CTS 9

2–6 Rev. 1

SNM-1001 Network Control Modem Installation

2.3.3 Faults (J7)

The fault connector on the modem is used to provide FORM-C contact closures for the purpose of fault reporting. There are three FORM-C summary fault contacts:

• Modulator

• Demodulator

• Common equipment

To obtain a system summary fault, connect all FORM-C contacts in parallel.

The fault interface is provided on a 9-pin female D connector. Screw locks are provided for mechanical security of the mating connector. The pinout of the connector is as follows:

Pin # Name Function

1 NO C ommon equipment is not f a ulte d 2COM 3 NC Common equipment is faulted 4 NO Modula tor is not faulted 5COM 6 NC Modulator is faulted 7 NO D e modulator is not faulted 8COM 9 NC Demodulator is faulted

Note:

A connection between the common (COM) and normally open (NO) contacts

indicates no fault.

2.3.4 TX IF Output (CP1)

CP1 is the transmit IF connector. The output impedance is 75Ω. The output power level is -5 to -30 dBm, in 0.1 dB steps.

In normal operation, the output will be a QPSK modulated result of the DATA I/O connector, between 50 and 180 MHz.

Rev. 1 2–7

Installation SNM-1001 Network Control Modem

2.3.5 RX IF Input (CP2)

CP2 is the receive IF connector. The input impedance is 50Ω (75Ω optional).

In normal operation, the desired carrier signal level should read between -30 and 55 dBm.

Signals between 50 and 180 MHz are selected and demodulated to produce clock and data at the DATA I/O connector.

2.3.6 AC Power

The AC power is supplied to the modem by a standard, detachable, non-locking, 3-prong power cord. Normal input voltage is 90 to 264 VAC, 47 to 63 Hz. The modem will automatically switch between ranges. Maximum power consumption is less than 40W.

2.3.7 DC Power

DC power is available as an option. The DC power is supplied to the modem by a 3 position terminal block. Normal input voltage is ± 48 VDC, consumption is less than 40W.

2.3.8 Chassis GND

A #10-32 stud is available on the rear panel for the purpose of connecting a common chassis ground between all of the equipment.

Note:

The safety ground is provided through the AC power connector.

2.3.9 AGC Test Point

The Automatic Gain Control (AGC) test point is a BNC connector on the back of the modem chassis. This feature allows the user to monitor the AGC.

10%. Maximum power

2–8 Rev. 1

This chapter describes the front panel operation and clocking options of the modem.

3.1 Front Panel

The front panel of the modem (Figure 3-1) is locked out. It displays SNM-1001. The NMS sets all values.

S N M -1001 N etw o rk C o n tro l M o d em

Chapter 3.

OPERATION

Figure 3-1. SNM-1001 Front Panel View

Rev. 1 3–1

Operation SNM-1001 Network Control Modem

3.1.1 LED Indicator

General modem status and summary fault information are indicated by 10 LEDs on the front panel. The indicators are defined in the following tables.

Faults

Name LED Description

Transmit Red Indicates that a fault condition e x ists in the transmit chain. Receive Red Indicates that a fault condition exists in the receive chain. Common Red Indicates that a common equipment fault condition exists. Stored Yellow Indicates that a fault has been logged and stored. The fault may or

may not be ac tiv e .

Status

Name LED Description

Power ON Green Indicates that power is applied to the modem. Transmitter ON Green Indicates that the transmitter is currently ON. This indicator ref le cts

the actual condition of the tra nsmitter, as opposed to the

programm e d c ondition. Carrier Detect Green Indicates that the decoder is locked. Test Mode Yellow Flashes when the modem is in a test conf ig uration.

Alarms

Name LED Description

Transmit Yellow Indic a te s tha t a transmit function is in an alarm condition. Receive Yellow Indicates that a receive function is in an alarm condition.

3.1.2 Front Panel Keypad Option

This feature is a future option which will allow the user to plug in a hand-held keypad, and will allow access to all programming capabilities.

3.2 Clocking Options

The clocking is addressed through the NMS.

3–2 Rev. 1

This chapter describes the theory of operation for the various PCBs in the modem.

4.1 Modulator

The modem modulator creates a QPSK modulated carrier within the 50 to 180 MHz range from the digital data stream provided by the interface section. The following subsections make up the modulator:

• Scrambler

• Convolutional encoder

• I/Q Nyquist filters

• Modulator

• Output amplifier

• RF synthesizer

• SCT synthesizer

Chapter 4.

THEORY OF OPERATION

Modulator jumper settings are shown in Table 4-1 .

A block diagram of the modulator is shown in Figure 4-1.

Rev. 1 4–1

Theory of Operation SNM-1001 Network Control Modem

Table 4-1. M&C Jumper Settings (AS/4973)

ConfigurationJumper Position

Redundant Non-Redundant

JP10 1 to 2 Closed Open

3 to 4 Closed Open 5 to 6 Open Closed

7 to 8 Open Closed JP 22 5 to 6 Open Closed JP 2 1 to 2 Closed Open

2 to 3 Open Closed JP 3 1 to 2 Closed Open

2 to 3 Open Closed JP 11 1 to 2 CTS shorted to TX FPGA CTS shorted to TX FPGA JP 6, JP7 2 to 3 Closed Closed JP 18 1 to 2 Closed Closed JP 21 2 to 3 Off Off

M&C

COMMAND

BUS

TX_DATA

TX_CLOCK

VCO

EXT. RX SAT CLK

MICROPROCESSOR

MPC

SCRAMBLERS

PREAMBLE GENERATOR POSTAMBLE

IF FILTER

CLOCK

MPC

DDS

IMPC

MPC

CONVOLUTIONAL

ENCODERS

REF OSC

SYNTH

VECTOR

ROTATION

Figure 4-1. Modulator Block Diagram

VARIABLE

ATTENUATOR

MPC

ATTENUATOR

DIGITAL

NYQUIST

DIGITAL

NYQUIST

OUTPUT SWITCH

RF SWITCH

DAC

50 to 180 MHz

-5 to-30 dBm

ALIAS

FILTER

ALIAS

FILTER

OUTPUT

IF LOOPBACK

SCT

4–2 Rev. 1

SNM-1001 Network Control Modem Theory of Operation

4.1.1 Specifications

Modulation Type QPSK Digital Data Rate:

QPSK, 1/2 Rate 19.2 kbit/s Test Modes Carrier null and quadrature (dua l a nd offset) CW Frequency Ra ng e 50 to 180 MHz Frequency Selec t Method Synthesized Frequency Step Size 100 Hz Frequency Stability (RF) Frequency Stability (SCT) Phase Error 2.5° maximum Filtering Type Nyquist, pre-equa lize d Spectral Occupancy Spurious and Harmonic s -55 dBc, 0 to 500 MHz Output Power Level Ra ng e Output Stability Output Power Adjustm e nt 0.5 dB step size Output Impedance Output Return Loss 20 dB minim um Scrambling CCITT V.35 FEC Encoding Convolutional K=7 1/2 Rate Viterbi Decoding Soft-decision Viterbi

Reported Faults AGC level fault

10 PPM internal oscillator

Spectral density is -30 dB , ± 0.75 symbol rate

-5 to -30 dBm, ± 0.5 dB

0.5 dB

Ω

Rate 1/2

Synthesizer f a ult I channel filter activity Q channel filter activity Clock activity f a ult

4.1.2 Theory of Operation

The modulator is composed of two basic sections: the baseband processing section and the RF section. The modem M&C controls all programmable functions in both sections.

Data to be transmitted will come from the interface card via the demodulator. The format is EIA-422, and includes a clock that is synchronous with the data. The data signal at this point is clean and free of jitter. The data signal goes to the scrambler, which provides energy dispersal. It then goes to a differential encoder. The data signal passes to the Viterbi K = 7 convolutional encoder.

The output of the encoder generates two separate data streams to drive the I&Q channels of the modulator. If selected from the front panel menu, one channel can be inverted, causing a spectral inversion.

Rev. 1 4–3

Theory of Operation SNM-1001 Network Control Modem

From the encoder, the data signal passes through a set of variable-rate digital Nyquist filters. The filter set is for Comtech EFData Closed Network. There are activity detectors on both the I&Q channel Nyquist filters.

The digital Nyquist filters are followed by Digital to Analog (D/A) converters and reconstruction filters. These filters provide proper spectral shaping and equalization. The filters are under control of the M&C. The symbol rate is 19.2 ks/s.

The I&Q filtered data signals are applied to the RF modulator, which converts them to a modulated carrier. The spectral shape will be identical to that of the input data streams, but double-sided about the carrier frequency.

The RF synthesizer provides the proper frequencies to convert the modulator IF to the desired output frequency in the 50 to 180 MHz range. The synthesizer has multiple loops, and incorporates a DDS chip to accommodate 100 Hz steps over a range of 130 MHz. The RF section has a frequency stability of

1 x 10-5.

The signal from the power combiner is sent to the output amplifier, which amplifies the low level signal from the modulator section to the proper level for output from the module. The amplifier contains circuitry that provides programmable control of the output level over a range of -5.0 to -30.0 dBm, in 0.1 dB steps. Power leveling is provided at

1.0 dB to maintain the stability of the output level over time and

temperature.

Fault information from the modulator is sent to the M&C, and includes:

• Synthesizers out-of-lock

• RF output leveled

• Input data clock activity

• I channel digital filter activity

• Q channel digital filter activity

4–4 Rev. 1

SNM-1001 Network Control Modem Theory of Operation

4.2 Demodulator

The modem demodulator converts a QPSK modulated signal of 50 to 180 MHz to a demodulated baseband data stream. The demodulator then performs error correction on the data stream, using a Viterbi decoding algorithm.

A block diagram of the demodulator is shown in Figure 4-2.

Demodulator jumper settings for selecting ROM size are listed in Table 4-1.

IF INPUT

50 TO 180 MHz

-55 TO -30 dBm

LOOPBACK

AGC

RXDATA

RXCLOCK

MICRO-

PROCESSOR

MPC

SYNCHRONOUS

DESCRAMBLER

IF FILTER

SYNTH

MPC

LOOP

DIGITAL

NYQUIST

DIGITAL

NYQUIST

ALIAS

FILTER

ALIAS

FILTER

VCO

DDS

VITERBI

MPC

DDS

A/D

SOFT DECISION MAPPING UNIQUE WORD DETECTOR

DIGITAL

COSTAS

DELAY

DIGITAL

CLOCK

Figure 4-2. Demodulator Block Diagram Burst Mode

Rev. 1 4–5

Theory of Operation SNM-1001 Network Control Modem

4.2.1 Specifications

Digital Data Rate:

QPSK, 1/2 Rate 19.2 kbit/s Symbol Rate 19.2 ks/s IF Frequency 50 to 180 MHz, in 100 Hz steps Input Level -30 to -55 dBm Decoding Ty pe 1/2 Filter Mask Closed network Scrambler Types 215-1 Synchronous Modulation Types QPSK

4.2.2 Theory of Operation

The demodulator card functions as an advanced, fully digital, coherent phase-lock receiver, and a Viterbi or Sequential decoder.

The following subsections make up the demodulator:

• RF synthesizer

• IF amplifier

• Quadrature demodulator

• Identical anti-aliasing filters

• D/A converters

• Digital Nyquist filters

• Costas loop

• Clock loop

• Automatic Gain Control (AGC)

• Automatic Offset Control (AOC)

• Unique word detector

• Ambiguity resolver

• Soft-decision decoder

• Synchronous descrambler

• End of message detector

The modulated signal enters the RF module, where it is converted from an IF signal at 50 to 180 MHz to I&Q baseband channels. The synthesizer has multiple loops, and incorporates a DDS chip to accommodate 100 Hz steps over a range of 130 MHz. The RF section has a frequency stability of

1 x 10-5.

The two channels are then passed through identical anti-aliasing filters, D/A converters, and digital Nyquist filters.

4–6 Rev. 1

SNM-1001 Network Control Modem Theory of Operation

The result is a filtered, digital representation of the received signal. A Costas loop maintains the phase lock during the message. A phase-lock loop maintains the data clock. The soft-decision mapper converts the I&Q samples to soft-decision values. The soft-decision values are then fed to the Viterbi decoder, where error detection and correction are performed.

The I&Q channels are also used to calculate the AGC and AOC voltages. The AGC and AOC are fed back to the RF module.

Finally, the data from the output of the Viterbi decoder is descrambled with a 2

-1 synchronous descrambler, and routed to the interface card. There also is a summary fault relay that provides a FORM C output located on the demodulator board.

The data clock phase can be selected from the Interface Utility menu.

Using Digital Signal Processing (DSP) techniques, the demodulator looks for carrier power in an 8 kHz bandwidth. When a carrier is detected, the DSP calculates the offset from the nominal frequency. The DSP then zeros out the offset. This occurs during the CW portion of the preamble sequence. During the second part of the preamble sequence, the clock phase is recovered. When the unique word is detected, the Demod determines the ambiguity of the received signal. It then corrects the ambiguity, if necessary, and starts feeding data to the Viterbi decoder. A delay generator determines when the first bit of the data packet comes out of the Viterbi decoder, and initiates the synchronous load of

the 2

-1 synchronous descrambler. After the descrambler starts the lock, the RR lines are set to true, denoting that valid data is being received. The demodulator, when locked, continually monitors the incoming data for the end-of-message marker. When the end-of-message marker is detected, a delay generator determines when the remaining data has been flushed out of the modem, and the Lock and RR line is set to false.

Note:

The data packet must not be less than 48 bits of data. There is no maximum length

for the data packet.

4.2.3 Viterbi Decoding Theory

The Viterbi decoder is used in open-network applications, typically in Intelsat Business Service (IBS) or Intermediate Data Rate (IDR) communication systems. The Viterbi decoder operates in conjunction with the convolutional encoder in the transmit modem. The Viterbi decoder and convolutional encoder correct the transmission channel errors in the received data stream.

Figure 4-3 is a block diagram of the Viterbi decoder.

Rev. 1 4–7

Theory of Operation SNM-1001 Network Control Modem

MICRO-

COMPUTER

BUS

I CHANNEL

Q CHANNEL

MICROCOMPUTER

INTERFACE

COSTAS

PROCESSOR

FREQUENCY

LOCKED LOOP

CLOCK

RECOVERY

DEPUNCTURE

DECODER

AMBIGUITY RESOLVERAND VW DETECTOR

INPUT

BUFFER

VITERBI DECODER INCLUDES

CHANNEL BER DETECTION

DESCRAMBLER

LOCK

DETECT

DDS

RECEIVE

CLOCK

AGC

CONTROL

Figure 4-3. Viterbi Decoder Block Diagram

The Viterbi decoder processes 3-bit quantized R0 and R1 parallel code bits (symbols) from the demodulator. The quantization is 3-bit soft-decision in sign/magnitude format. This is a representation of the data transmitted, corrupted by additive white Gaussian noise. The decoder uses the code symbols produced by the encoder to determine which symbols have been corrupted by the transmission channel. The decoder corrects as many corrupted symbols as possible.

The data signal passes through an ambiguity resolver, which compensates for the potential 90° phase ambiguity inherent in a QPSK demodulator.

A set of branch metric values is then computed for each of the received symbol pairs. The values are related to the probability that the received symbol pair was actually transmitted as one of the four possible symbol pairs. The branch metrics are then processed by the Add-Select-Compare (ASC) computer.

The ASC computer makes decisions about the most probable transmitted symbol stream by processing the current branch metrics with the state metrics computed for the 64 previous decoder inputs. The results of the ASC computer are stored in memory called “path memory.”

4–8 Rev. 1

SNM-1001 Network Control Modem Theory of Operation

Path memory is 80 states in depth. The path with the maximum metric is designated as the survivor path, and its data are used for output. The difference between the minimum and the maximum path metrics is used as the means of determining synchronization of the decoder.

The output data may then be descrambled and differentially decoded. Both of these processes are optional, and may be selected locally or remotely. The data signal out of the differential decoder is sent to the interface card for formatting and output.

The synchronization signal is used for lock detect, and is sent to the M&C. The raw BER count is generated from re-encoding the decoded data and comparing it to a delayed version of the input data. The count is then sent to the M&C for further processing.

4.3 Monitor and Control

The modem uses a sophisticated micro-controller module to perform the M&C functions of the modem. This module is located on the demodulator board, and is referred to as the “M&C.” The M&C monitors the modem and provides configuration updates to other modules within the modem when necessary.

The modem configuration parameters are maintained in battery-backed RAM. The RAM provides for total recovery after a power-down situation.

Extensive fault monitoring and status gathering are provided.

All modem functions are accessible through a remote communications interface.

4.3.1 Non-Volatile Memory

Non-volatile memory on the M&C module allows it to retain configuration information without prime power for at least one year. Should the modem be powered down, the following sequence is carried out when power is re-applied to the M&C:

1. The micro-controller checks the non-volatile memory RAM to see if valid data has been retained. If valid data has been retained, the modem is reconfigured to that information.

2. If non-volatile memory fails the valid data test, a default configuration from ROM is loaded into the system.

Rev. 1 4–9

Theory of Operation SNM-1001 Network Control Modem

4.3.2 Remote Interface Specification

Refer to Appendix A for the remote interface specification.

4.3.3 M&C Theory of Operation

The M&C module is built around the Intel 80C32 micro-controller, operating at

11.0592 MHz. The microsystem is designed to support up to 512 kbytes of read-only code memory, and up to 32 kbytes of non-volatile random-access data memory.

4.3.4 Remote Interface Configuration

All modem functions can be remotely controlled and monitored via an EIA-232-C communications link. The EIA-232-C interface is used to communicate with a single modem.

For M&C jumper settings, refer to Table 4-1.

4.3.5 Modem Defaults

The M&C has default settings that are loaded into the modem at power-up. These default settings are also loaded each time the modem has been hard reset. The following tables list the defaults settings for each modem configuration parameter.

Modulator Defaults Demodulator Defaults

Data Rate A Data Rate A

TX Rate A 19.2 kbit/s, QPSK RX Rate A 19.2 kbit/s, QPSK TX-IF Frequency 70 MHz RX-IF Frequency 70 MHz TX-IF Output ON Descrambler ON Mod Power Offse t 0 dB Differential Decoder OFF TX Power Output -10 dBm Demodulator Type INTELSAT Open Scrambler O N Decoder Type Viterbi, 1/2 Rate Differentia l Encode r OFF IF Loopback OFF Modulator Type INTELSAT O pe n RF Loopback OFF Encoder Type Viterbi, 1/2 Rate BER Threshold None CW Mode Normal (OFF)

Interface Defaults System Defaults

TX Clock Source T X T ER RE ST R IAL Time 12:00 AM TX Clock Phase NORMAL Date 7/4/76 RX Clock Phase NORMAL Baud Rate 9600 Baseband Loopback OFF Parity Even

Defaults for Burst Mode

Address 1 Operation Mode Duplex

4–10 Rev. 1

SNM-1001 Network Control Modem Theory of Operation

Defaults for Continuous Mode

Modulator Defaults Demodulator Defaults

Data Rate A Data Rate A

TX Rate 19.2 kbit/s, QPSK RX Rate 19.2 kbit/s, QPSK TX-IF Frequency 70 MHz RX-IF Fr e que nc y 70 MHz TX-IF Output ON Descrambler ON Mod Power Offse t 0 dB Differential De c ode r ON TX Power Output -10 dBm Demodulator Ty pe INTELSAT Ope n Scrambler ON Decoder Type Viterbi Differentia l Encode r ON IF Loopback OFF Modulator Type INTELSAT Open RF Loopback OFF Encoder Type Viterbi Sweep Center

Frequency

CW Mode Norm a l ( O FF) Sweep Range 70000 Hz

BER Threshold None

Interface Defaults System Defaults

TX Clock Source TX TERRESTRIAL Time 12:00 AM Buffer Clock Sourc e RECEIVE SATELLI T E Date 7/4/76 TX Clock Phase AUTO Baud Ra te 9600 RX Clock Phase NORMAL Parity Even Baseband Loopba c k OFF Addres s 1 Buffer Size BYPASS Operation Mode Duplex

0 Hz

Rev. 1 4–11

Theory of Operation SNM-1001 Network Control Modem

4.4 Digital Interfaces

The modem interface module is a daughter card that plugs onto the demodulator board. The module provides the interface for terrestrial data and overhead signals, and the fault reporting output of the modem.

EIA-422/449 and EIA-232-C interfaces are available for input and output of terrestrial data when the modem is in the Continuous mode. Both baseband and interface loopbacks are provided. The terrestrial data rate is 19.2 kbit/s.

4.4.1 EIA-422/449 Interface

4.4.1.1 Functional Description

The EIA-422/449 digital interface provides the level translation, buffering, and termination between the internal modem signals and the EIA-422/449 interface on the rear panel.

Electrical characteristics of the EIA-422/449 interface signals are defined in EIA STD EIA-422. Details of the mechanical interface are found in EIA STD EIA

449.

A functional diagram of the interface is shown in Figure 4-4.

The EIA-422/449 interface provides a Send Timing (ST) clock signal at the modem data rate.

• In the Internal Clock mode, the data to be transmitted, Send Data (SD), must be synchronized to ST.

• In the External Clock mode, the clock is accepted on the Terminal Timing (TT) input to clock-in the data to be transmitted.

• In either Internal or External Clock mode, the phase relationship between the clock and data is not important as long as it meets the EIA-422/449 jitter specifications.

4–12 Rev. 1

SNM-1001 Network Control Modem Theory of Operation

3 5

33,3

0 81135,36

A clock phase correction circuit is provided which shifts the clock away from the data transition times. The clock phasing is jumper selectable at JP1.

• When there is no jitter on the clock source, the Auto setting is used.

• The Normal setting is used when standard specifications on clock and data

relationships exist.

• The Invert mode is used when the incoming clock is inverted from the standard clock and data relationship. Refer to Table 4-1 for jumper settings.

+TT

DF1

+12V

-12V

INTF

INTF1

MOD FAULT

+ +

-RT

-RD

+RR

+DM

-DM 11

Figure 4-4. EIA-422/449 Diagram

Data received by the modem is output on the Received Data (RD) lines, while the recovered clock is output on the Receive Timing (RT) lines.

For applications that require the rising edge of the clock to occur in the middle of the data bit time, receive clock Normal mode should be selected.

Invert mode puts the falling edge of RT in the middle of the data bit. This selection can be made from the front panel in the Configuration menu or from a remote terminal.

Rev. 1 4–13

Theory of Operation SNM-1001 Network Control Modem

The Request To Send (RTS) lines are hardwired by JP11 to the Clear To Send (CTS) lines on the Demod/M&C card (AS/4973-2) for Continuous mode operation.

The RTS line is activated for Burst mode by jumping pins 1 and 2 on JP11.

Data Mode (DM) indicates that the modem is powered up.

Receiver Ready (RR) indicates that an RF carrier is being received and demodulated with a sufficiently low error rate for the decoder to remain locked.

The EIA-422/449 interface also provides bi-directional relay loopback of both the clock and data at the DCE interface.

• In loopback from the DTE side, SD is connected to RD, and either ST or TT (in Internal or External mode) is looped back to RT.

• From the modem side, the received data and recovered clock are routed back to the modulator input for retransmission.

The Common Equipment, Modulator, and Demodulator fault outputs are provided on dry contact FORM C relays. They are available on the Fault connector on the modem rear panel. Fault indicators are also provided on Transistor/Transistor Logic (TTL) open collector drivers on the EIA-422/449 connector.

• The TTL MOD fault indicates a Modulator or Common Equipment fault.

• The TTL DEMOD fault indicates a Demodulator or Common Equipment fault.

4.4.1.2 Specification

Circuit Supported SD, ST, TT, RD, RT, D M, RR, MC , MOD FAULT,

Amplitude (RD, RT, ST , DM, RR) 4, ± 2V differential into 100Ω. DC Offset (RD, RT, ST, DM, RR) 0.0, ± 0.4V. Impedance (RD, RT, ST , D M, RR) Less than 100Ω, differential. Impedance (SD , TT, MC) 100, ± 20Ω, differential. Polarity True when B positive w ith re spe ct to A.

Phasing (RD, RT) False-to-true transition of RT nominally in c e nter of RD da ta

Symmetry (ST, TT, RT) 50%, ± 5%. Frequency Stability (ST ) Modulator Fault Open collector output. Fa ult is ope n ci rc uit.

Demodulator Fault Open collector output. Fault is open c irc uit.

DEMOD FAULT.

False when A positive w ith re spec t to B.

bit.

100 PPM.

15V maximum, 20 mA maximum current sink.

4–14 Rev. 1

This chapter provides the following information:

• System checkout

• Modulator faults

• Module identification

• Software versions

• Repacking requirements

5.1 System Checkout

Chapter 5.

MAINTENANCE

The system checkout section is to be used as an aid in setting up a modem within the earth station. It includes E

and constellation pictures.

Rev. 1 5–1

tables, a typical output spectrum, and typical eye pattern

b/N0

Maintenance SNM-1001 Network Control Modem

5.1.1 Modulator Checkout

A typical output spectrum is shown in Figure 5-1. If the output does not resemble this picture, refer to the fault isolation in Section 5.2 to locate the problem.

Figure 5-1. Typical Output Spectrum

The carrier frequency is selected through the NMS.

5–2 Rev. 1

SNM-1001 Network Control Modem Maintenance

5.1.2 Demodulator Checkout

The input to the demodulator card must be set within the proper frequency and power level ranges for the demodulator to lock to the signal. Refer to Figure 5-2 and the table below to check for proper E

b/N0

level.

The following table lists Comtech EFData’s conversion of (S+N)/N to S/N and E 1/2 data rate:

(dB) Code Rate 1/2

(S+N)/N S/N Eb/N

4.0 1.8 1.8

4.5 2.6 2.6

5.0 3.3 3.3

5.5 4.1 4.1

6.0 4.7 4.7

6.5 5.4 5.4

7.0 6.0 6.0

7.5 6.6 6.6

8.0 7.3 7.3

8.5 7.8 7.8

9.0 8.4 8.4

9.5 9.0 9.0

10.0 9.5 9.5

10.5 10.1 10.1

11.0 10.6 10.6

11.5 11.2 11.2

12.0 11.7 11.7

12.5 12.2 12.2

13.0 12.8 12.8

13.5 13.3 13.3

14.0 13.8 13.8

14.5 14.3 14.3

15.0 14.9 14.9

15.5 15.4 15.4

16.0 15.9 15.9

16.5 16.4 16.4

17.0 16.9 16.9

17.5 17.4 17.4

18.0 17.9 17.9

18.5 18.4 18.4

19.0 18.9 18.9

19.5 19.5 19.5

20.0 20.0 20.0

b/N0

for

Figure 5-2 is an example of the typical output spectrum noise for a 1/2 rate carrier operating at an E

of 8.0 dB. (S+N)/N is measured by taking the average level of the

b/N0

noise and the average level of the top of the modem spectrum as shown. Use this measurement for the first column on the above table. Read across the page to find the S/N and E

Rev. 1 5–3

for the specific code rate.

b/N0

Maintenance SNM-1001 Network Control Modem

Figure 5-2. Typical Output Spectrum Noise

5–4 Rev. 1

SNM-1001 Network Control Modem Maintenance

With Noise

Without Noise

Figure 5-3. Typical Eye Constellations

Rev. 1 5–5

Maintenance SNM-1001 Network Control Modem

5.1.3 Test Points

The modem does not have accessible test points. When troubleshooting is required at board level, the cover must be removed.

The following is a list of test points located on the PCB, and a description of the signals that should be present under normal operation.

5.1.3.1 Modulator Test Points

TP 1 DATA CLOCK TTL level clock that is locked to the incoming data to the interface

card.

TP 2 SYMBOL CLOCK TTL level clock that is locked to the incoming clock to the interface

card. This clock is r unning a t the s ymbol frequenc y and not at the data rate. The f re que nc y is equal to:

BPSK = 2 x Bit Clock

•

QPSK1/2 = Bit Clock

•

QPSK3/4 = 2/3 Bit Clock

•

QPSK7/8 = 4/7 Bit Clock

•

TP 3 Q MIXER Analog output of the Q channe l ba seba nd re c onstruc tion f ilte r a nd

the input to the RF modulator. TP 4 Q DIGITAL FILTER Analog output f rom the Digital filter. TP 5 I DIGITAL FIL TER Analog output from the Digital filter. TP 6 I MIXER Analog output of the I channel ba se ba nd rec onstruc tion filter and the

input to the RF modulator.

5–6 Rev. 1

SNM-1001 Network Control Modem Maintenance

5.1.3.2 Demod/M&C/Interface Test Points

TP 3 +5V +5V TP 4 GND Ground TP 11 GND Gr ound TP 12 SD Send Data TP 13 TT Terminal Timing (Transmit Clock) TP 14 RD Receive Data TP 15 RT Receive Timing TP 16 GND Gr ound TP 18 I I Channel Analog R F Output TP 19 Q Q Channel Analog R F O utput TP 20 Q OFF Analog Q Channel D C O ffset Control TP 21 Q CHAN Q Channel Analog Anti-Alias Filter

Output

TP 22 I CHAN I Channel Analog Anti-A lias Filte r

Output TP 24 I OFF Analog I Channel D C O ffset Control TP 25 GND Gr ound TP 26 AGC DRV Analog AGC Drive TP 27 Q A/D IN Q Channel Analog to Di g ita l Input TP 28 AGC CTRL Digital AGC Control TP 29 GND Gr ound TP 30 I A/D IN I Channel Analog to Digital Input TP 31 IF SYNTH REF (R143 must be populated) IF Synthesizer R e f e r e nc e TP 34 DATCLK Data Rate Clock TP 36 RX CLOCK Buffer Output CL K TP 37 DP1 Constellation I Test Point TP 38 DP2 Constellation Q Test Point TP 41 SYMBCK Symbol Clock D9 OVFL Buffer Overflow LED D10 UNFL Buffer Underflow LED D11 DON/PG XILINX Done Programming LED

Rev. 1 5–7

Maintenance SNM-1001 Network Control Modem

5.2 Fault Isolation

The modem has been designed so that a qualified technician may isolate fault conditions without removing the modem from its location. The fault monitoring capability of the modem is designed to aid the operator in determining the cause of a failure.

System faults are reported in the Fault menu. Stored faults are reported in the StFaults menu. The following list is to be used in isolating the problem and deciding the appropriate action to be taken. Figure 5-4 and Figure 5-5 are diagrams of the SNM-1001 fault tree in the Burst mode and Continuous mode, respectively.

SNM-1001

FAULT TREE

MOD FAULT S

IF SYNTHESIZER DATA CLOCK SYN

AGC MODULE

DEMODFAULTS

IF SYNTHESIZER MODULE

TX IF OUTPUT OFF

TX FAULT LED

111

111 1

111

TX FAULT RELAY

RX FAULT LED

RX FAULT RELAY

11 11

COM EQ FAULT LED

COM EQ FAULT RELAY

TX ALARM LED

INTERFACE FAUL T S

RX ALARM LED

COMMON EQUIPMENT FAULTS

BATTERY/CLOCK

-12VPOWER SUPPLY +12VPOWER SUPPLY +5VSUPPLY CONTROLLER INTERFACE MODULE

Figure 5-4. SNM-1001 Fault Tree (Burst Mode)

TX FAULT LED

TX IF OUTPUT OFF

RX FAULT LED

TX FAULT RELAY

COM EQ FAULT LED

RX FAULT RELAY

1 111

11 1111

COM EQ FAULT RELAY

1TX INTF FLTTX CLK ACTIVITY

TX ALARM LED

RX ALARM FAULT LED

5–8 Rev. 1

SNM-1001 Network Control Modem Maintenance

SNM-1001

FAULT TREE

MOD FAULT S

IF SYNTHESIZER DATA

CLOCK SYN

I CHANNEL Q CHANNEL

AGC MODULE

DEMODFAULTS

MODULE IF SYNTHESIZER

I CHANNEL Q CHANNEL DESCRAMBLER BER THRESHOLD

TX IF OUTPUT OFF

TX FAULT LED

111

TX FAULT RELAY

RX FAULT LED

RX FAULT RELAY

COM EQ FAULT LED

TX ALARM LED

COM EQ FAULT RELAY

INTERFACE FAUL T S

RX ALARM LED

BUFFER UNDERFLOW_ BUFFER OVERFLOW RX INTF FLTS BUFFER CLOK ACT

TX INTF

FLTTX CLK ACTIVITY

COMMON EQUIPMENT FAULTS

1MODULE

BATTERY/CLOCK

-12VPOWER SUPPLY +12VPOWER SUPPLY +5VSUPPLY CONTROLLER INTERFACE MODULE

Figure 5-5. SNM-1001 Fault Tree (Continuous Mode)

TX FAULT LED

TX IF OUTPUT OFF

RX FAULT LED

TX FAULT RELAY

COM EQ FAULT LED

RX FAULT RELAY

1 111

11 1111

COM EQ FAULT RELAY

TX ALARM LED

1 1

RX ALARM FAULT LED

Rev. 1 5–9

Maintenance SNM-1001 Network Control Modem

5.2.1 Modulator Faults

5.2.1.1 Continuous Mode

Fault/Alarm Possible Problem and Action

IF SYNTHESIZER Modulator IF synthesizer is faulted.

This is considered a major alarm and will turn OFF the modulator output. Return the modem for repair.

DATA CL O CK SY N Transmit data clock sy nthe s iz e r fault.

This fault is an indication that the inte rnal cloc k VCO ha s not lock e d to the incoming data cloc k , or the inte rna l c loc k s ynthesizer has not loc k e d to the internal reference. T his is conside re d a major alarm and w ill turn OFF the modulator output.

Check to see that the proper data rate has been set up and selected. Verify that the incoming data rate matches what has been selected in the modem. Verify the frequency of the input data clock to be within the lock range of 100 PPM. If the inputs to the modem are all correct and the proble m still exists, replace the modem and return for repair.

I CHANNEL Activity alarm for the I channel digital filter.

This alarm is cons ide re d a major alarm and will turn OFF the modulator IF output.

An alarm in this position indicate s e ithe r a f a ult in the scra mbler or, if the scrambler is disabled, it indicates a loss of inc om ing da ta . If the f a ult is a ctiv e with the scram bler tur ned O FF, che c k to se e tha t the re is input da ta a t the da ta I/O connector. If data is present, the problem could be in the interface section. If the fault is active w ith the sc ra mbler turned ON, the problem could be in the modulator section. R e turn the modem for re pair .

Q CHANNEL Activity alarm for the Q channe l dig ital filter.

Follow the same procedure as for the I channel.

AGC LEVEL Output power AG C le v e l fault.

Indicates that the leve l a t the modulator output is not the level that is programmed. Replace the modem and return it for repair.

MODULE Modulator module fault.

Typically indic at es the modulator will not program . This could indicate a problem in the interface between the modulator and M&C due to m odula tor firmwa re be ing ins ta lle d inc orre c tly, or a pin not maki ng c ontac t . Ver ify the modulator firmware is correctly insta lled. If the problem still exists , return the modem for re pa ir .

5–10 Rev. 1

SNM-1001 Network Control Modem Maintenance

5.2.2 Demodulator Faults

5.2.2.1 Burst Mode

Fault/Alarm Possible Problem and Action

IF SYNTHESIZER Demodulator IF synthesizer f a ult.

Indicates the dem odulat or IF s ynthesizer is f aulte d. This fault is a hardw a re failure. Return the modem for repair.

MODULE De modulator module fault.

Typically indic a te s the de modulator will not program . This could indicate a problem in the M&C or in the interface between the demodulator and M&C. Return the modem for repair.

5.2.3 Transmit Interface Faults

Fault/Alarm Possible Problem and Action

TX CLOCK ACT Activity detector alarm of selected interface transmit clock.

Indicates the selected TX clock is not detected. Verify the signal at the selected TX clock source. The interface will fall back to the internal clock when this alarm is active.

5.2.4 Receive Interface Faults

5.2.4.1 Burst Mode

This fault is not applicable when the modem is in the Burst mode.

Rev. 1 5–11

Maintenance SNM-1001 Network Control Modem

5.2.5 Common Equipment Faults

Fault/Alarm Possible Problem and Action

BATTERY/CLOCK M&C battery voltage or clock fault.

Indicates a low voltag e in the memory battery. Typically will be active when a modem has be e n ha rd r e se t, or the firmware ha s be e n cha ng e d. When a hard reset has been executed or the firmware has been changed, this fault may be active when the modem is first turne d ON . It s hould c le ar a utom a tic a lly as the battery charg e s up.

-12V -12V power supply fault.

Indicates a high or low v oltag e c ondition. L e v e l is the -12V line from the power supply or on the boa r d. Che c k TP 2 on the M&C section to verify the prope r -12V m onitor v olta g e (1.06V). If this v olta g e is not correct, the modem will verify tha t the -12V supply is not at the proper level. This would indicate the power supply is f aulte d. R e turn modem for repa ir .

+12V +12V power supply fa ult.

Use the same pr oc e dure a s with -12V fault. To ve rify the +12V pow e r s upply voltage, check T P 4 on the M& C. A voltage of 3.81V will be monitored when the +12V is at the proper level.

+5V +5V power supply fault.

Use the same pr oc e dure a s with -12V fault. To ve ri f y the +5V power s upply voltage, check T P 5 on the M&C se c tion. A voltage of 2.5V will be monitored when the +5V is at the proper level.

CONTROLR Controller fault.

Indicates loss of power in the M&C card. Typically indicates the controller has gone through a powe r O N - OFF c ycle.

INTERFACE Interface module fault.

Indicates a problem in programming the interface. This could indicate a problem in the M&C or in the interface between the interface section and M&C. Return the modem for repair.

5%. Check for a short on

5–12 Rev. 1

SNM-1001 Network Control Modem Maintenance

5.3 Module Identification

The modem PCBs each have an assembly number marked on the board. The latest revision is stamped on the board, along with the serial number.

Comtech EFData tracks the hardware by the assembly number, revision, and serial number.

When replacing a plug-on module, care must be taken to ensure proper orientation of the card.

CAUTION

Refer to the individual sections on each module for location of the configuration identification.

Refer to Table 5-1 for a list of part numbers and descriptions of various modules used in the modem.

Table 5-1. Comtech EFData Part Numbers for Various Modules

Chassis Assembly Base Part #

Dash #

1 2

RF Modulator Part #

Dash #

RF Demodulator Part #

Dash #

Interface

EIA-422 AS/2524

5.4 Software Versions

S/W Version Firmware # Description of Change

1.1.1 3060-1- Original release.

2.1.1 3060-1A Added support for D oppler buffer and Comstre am compatibility

3.1.1 3060-1B Added sequential BPSK code rate suppor t.

3.1.2 3060-1C Correctional changes.

4.1.1 3060-1D Added Modem Type to Utility menu to allow SDM-100 or SDM-

4.1.2 3060-1E Correctiona l c hang e s .

4.1.3 3060-1F Correctional changes.

5.1.1 3060-1G Added support for Fa irchild c ompatibility.

5.1.2 3060-1H Correctional c hang e s .

6.2.1 3060-1I Added support for SDM-51 compatibility .

AS/5182-X

Description

AC, EFD, With Display DC, EFD, With Display

AS/3995-X

Description

Modulator

Ω

AS/4401-X

Description

Demodulator

Ω

for Modulator Type and Demodula tor Type.

650 emulation.

Rev. 1 5–13

Maintenance SNM-1001 Network Control Modem

7.2.1 3060-1J Added rev-emulation for bac kward-com pa tible ope ra tion. Added ADPCM option, and changed a c quisition r a ng e to ± 35 kHz.

7.2.2 3060-1K Correctional c hang e s .

8.2.1 3060-1L Added re mote support of TX-IF output us ing R TS signal.

8.2.2 3060-1M Correctional changes.

9.2.1 3060-1N Added support for ASYNC/A UPC inte rface and support for 8-bit, no parity.

10.3.1 3060-1P Added support f or ne w RF board.

11.4.1 4328-1- Update from FW/3060-1 adding support for SD M-150.

12.5.1 4328-1A Added Reed-Solomon support.

13.6.1 4328-1B Added spect ra l inv e r s ion.

13.6.2 4328-1C Correctional chang e s .

13.6.3 4328-1D Correctional changes.

13.6.4 4328-1E Correctional changes.

14.7.1 4969-14969-2-

14.7.2 4969-1A

4969-2A

14.7.3 4969-1B

4969-2B

14.7.4 4969-1C

4969-2C

15.7.1 4969-1D

4969-2D

15.7.2 4969-1E

4969-2E

15.7.3 4969-1F

4969-2F

15.7.4 4969-1G

4969-2G

15.7.5 4969-1H

4969-2H

15.7.6 4969-1J 4969-2J

15.7.7 4969-1K

4969-2K

15.7.8 4969-1L

4969-2L

Replaces FW/3060-1 and 4328-1, combining support f or AS/2528 with support f or AS/4973. Removed 38400 burs t s uppor t f or ne w RF Demod.

Added two new r e mote comma nds for network opera tion.

Correctional changes.

Added Asy nc information to rem ote s ta tus c ommands.

Affec ts only IDC-150 operations.

Allows 10 kbit/s for QPSK 1/2.

Fixed extended Eb/No for new A S/4973.

Fixed Viterbi based repor ting for Eb/N

Fixed bit error threshold ala rm.

Added support to allow N MS c ontrol RF dur ing s ystem fa ilure s .

Added support for NMS to a llow modem to have an option to boot up with display SNM-1001 in front panel.

5.5 Repackaging Requirements for Shipment

If it is necessary to return the modem for repair, the modem must be shipped in the original factory packaging or equivalent packing material for protection.

Failure to comply with the repackaging requirements will void the warranty.

CAUTION

5–14 Rev. 1

Appendix A.

REMOTE CONTROL OPERATION

This appendix describes the remote control operation of the SNM-1001.

• Firmware number: FW/4969-1L and FW/4969-2L

• Software version: 15.7.7

The -2 version is the PLCC (Plastic Leadless Chip Carrier) version, applicable to the SDM-100A and -150A.

The -1 version is the 28-pin DIP version, applicable to the SDM-100 and -150.

Rev. 1 A–1

Remote Control Operation SNM-1001 Network Control Modem

A.1 General

Remote controls and status information are transferred via an EI A485 (optional EI A232C) serial communications link.

Commands and data are transferred on the remote control com munications link as US ASCII-encoded character strings.

The remote communications link is operated in a half- duplex m ode.

Communications on the rem ote link are initiated by a rem o te controller or term inal. The modem never transm its data on the link unless it is commanded to do so.

Since the SNM-1001 operates in both Burst and Continuous modes, command and command parameter selection will be dependent upon whether the Transmit Mode has been configured as Burst or Continuous, and whether the Receive Mode has been configured as Burst or Continuous. The SNM-1001 modem will default to Transmit Burst, Receive Burst modes after a cold startup, or when a hard reset has been initiated.

A–2 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

A.2 Message Structure

The ASCII character form at used requires 11 bits/character:

• 1 start bit

• 7 information bits

• 1 parity bit

• 2 stop bits

Messages on the remote link fall into the categories of commands and responses.

Commands are m essag es w hich are transmitted to a satellite modem, while responses are messages returned by a satellite m odem in response to a com mand.

The general message structure is as follows:

• Start Character

• Device Address

• Command/Response

• End of Message Character

A.2.1 Start Character

A single character precedes all messages transmitted on the remote link. This character flags the start of a message. This character is:

“<”

•

for commands

“>”

for responses

A.2.2 Device Address

The device address is the address of the one satellite modem which is designated to receiv e a transmitted command, or w hich is responding to a com m and.

Valid device addresses are 1 to 3 characters long, and in the range of 1 to 255. Address 0 is reserved as a global address which simultaneously addresses all dev ices on a g iv en communications link. Devices do not acknowledge global commands.

Each satellite modem which is connected to a com mon remote comm unications link must be assigned its own unique address. Addresses are software selectable at the modem, and must be in the range of 1 to 255.

Rev. 1 A–3

Remote Control Operation SNM-1001 Network Control Modem

A.2.3 Command/Response

The command/response portion of the messag e contains a v ariable-length character sequence which conveys command and response data.

If a satellite modem receiv es a message addressed to it which does not match the established protocol or cannot be implemented, a negativ e acknowledg ment message is sent in response. This message is:

add/?ER1_parity error'cr''lf']

• >

(Error message for received parity errors.)

>add/?ER2_invalid parameter'cr''lf']

•

(Error message for a recognized command which cannot be implemented or has parameters which are out of range.)

add/?ER3_unrecognizable command'cr''lf']

• >

(Error message for unrecognizable command or bad command syntax.)

>add/?ER4_modem in local mode'cr''lf']

•

(Modem in local error; send the REM command to go to remote mode.)

>add/?ER5_hard coded parameter'cr'' lf']

•

(Error message indicating that the parameter is hardware dependent and may not be changed remotely.)

Note:

add is used to indicate a valid 1 to 3 character device address in the range

between 1 and 255.

A.2.4 End Character

Each message is ended with a single character which sig n als the end of the m essag e:

“cr”

•

“]”

•

Carriage return character for commands End bracket for responses

A–4 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

A.3 Configuration Commands/Responses

A.3.1 Modulator

Modulator Frequency

RF Output (IF Output)

Modulator Rate Preset Assignment

Modulator Rate Preset Selection

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response

Status: Response:

Command: Response:

Status:

<add/MF_nnn.nnnn'cr' >add/MF_nnn.nnnn'cr' RF_OFF'cr''lf']

<add/MF_'cr' >add/MF_nnn.nnnn'cr''lf']

<add/RF_xxx'cr' >add/RF_xxx'cr''lf']

<add/RF_'cr' >add/RF_xxx'cr''lf']

<add/AMRx_nnnn_mmm.mmm'cr' >add/AMRx_nnnn_mmm.mmm'cr''lf']

<add/AMRx_'cr' >add/AMRx_nnnn_mmm.mmm'cr''lf']

<add/SMRx_'cr' >add/SMRx_'cr' RF_OFF'cr''lf']

See MR command.

Where: nnn.nnnn = Frequency in MHz, 50.0000 to

180.0000, in 2.5 kHz steps. Note: When the modulator frequency is program med, the

RF output is switched off.

Where: xxx = ON or OFF.

Where:

x = A, B, C, D, or V (Preset designator). nnnn = 1/2, 3/4, 7/8, or BP12 (Coder rat e). mmm.mmm = Data rate in kHz.

Notes:

1. When ADPCM Interface is selected, only 32.000 and

64.000 are allowed.

2. When the Async Interface is used. I f the ASYNC baud rate is higher than allowable for the new data rate, the maximum baud rate will be select ed automatically.

Where: x = A, B, C, D, or V (Preset designator). Note: Setting the m odul ator rate turns off the RF transmitter.

Modulator Rate Variable Assignment & Selection

Set Modulator Power Offset

Command: Response:

Status:

Command: Response:

Status: Response:

<add/SMRV_nnnn_mmm.mmm'cr' >add/SMRV_nnnn_mmm.mmm'cr' RF_OFF'cr''lf']

See MR command.

<add/MPO_snn.n'cr' >add/MPO_snn.n'cr''lf']

<add/MPO_'cr' >add/MPO_snn.n'cr''lf']

Where:

nnnn = 1/2, 3/4, 7/8, or BP12 (Coder rat e). mmm.mmm = Data rate in kHz.

Notes:

1. Setting the modulator turns off the RF transm itter.

2. When ADPCM Interface is selected, only 32.000 and

64.000 are allowed.

3. When the Async Interface is used. I f the ASYNC baud rate is higher than allowable for the new data rate, the maximum baud rate will be select ed automatically.

Where: snn.n = +49. 9 to -49.9, in 0.1 dB increments. Note: The modulator power offset i s added to the nominal

power level to adjust the transm i t power range.

Rev. 1 A–5

Remote Control Operation SNM-1001 Network Control Modem

Set Modulator Output Power Level

Scrambler Enable

Differential Encoder Enable

Modulator Type

Modulator Encoder Type

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/MOP_snn.n'cr' >add/MOP_snn.n'cr''lf']

<add/MOP_'cr' >add/MOP_snn.n'cr''lf']

<add/SE_xxx'cr' >add/SE_xxx'cr''lf']

<add/SE_'cr' >add/SE_xxx'cr''lf']

<add/DENC_xxx'cr' >add/DENC_xxx'cr''lf']

<add/DENC_'cr' >add/DENC_xxx'cr''lf']

<add/MT_xxxx'cr' >add/MT_xxxx'cr''lf']

<add/MET_xxx'cr' >add/MET_xxx'cr''lf']

Where: snn.n = -30. 0 to -5.0, in 0.1 steps (nominal range in dBm).

Notes:

1. The nominal power range is modified relative to the value specified by the modulator power offset (MPO_).

2. The MOP_ command will return status only when local AUPC is enabled.

Where: xxx = ON or OFF.

Where: xxxx = INTL (INTELSAT OP EN NETWORK), EFD (COMTECH EFDATA CLOSED NETWORK), CSC (COMSTREAM CLOSED NETWORK), FDC (FAIRCHILD CLOSED NETWORK), or SDM51 (SDM51 COMPATIBLE).

Where: xxx = VIT (K-7 VITERBI ENCOD ER) or SEQ (SEQUENTIAL ENCODER).

Transmit BPSK Data Ordering

Modulator Spectrum Rotation

ReedSolomon Encoder Enable

Modulator Spectrum Rotation

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/TDA_xxx'cr' >add/TDA_xxx'cr''lf']

<add/MSR_xxxx'cr' >add/MSR_xxxx'cr''lf']

<add/MSR_'cr' >add/MSR_xxxx'cr''lf']

<add/RSEN_xxx'cr' >add/RSEN_xxx'cr'lf']

<add/RSEN_'cr' >add/RSEN_xxx'cr'lf']

<add/MSR_xxxx'cr' >add/MSR_xxxx'cr''lf']

<add/MSR_'cr' >add/MSR_xxxx'cr''lf']

Where: xxx = NRM (STANDARD) or INV (NON STANDARD).

Where: xxxx = NRM (n ormal spectrum) o r INV (inve rted spectrum).

Where: xxx = ON or OFF.

Where: xxxx = NRM (n ormal spectrum) o r INV (inve rted spectrum).

A–6 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

A.3.2 Demodulator

Set Demod Frequency

Demod Rate Preset Assignment

Demod Rate Preset Selection

Demod Rate Variable Assignment & Selection

Command: Response:

Status: Response:

Command: Response

Status: Response:

Command: Response:

Status: Command:

Response: Status:

<add/DF_nnn.nnnn'cr' >add/DF_nnn.nnnn'cr''lf']

<add/DF_'cr' >add/DF_nn.nnnn'cr''lf']

<add/ADRx_nnnn_mmm.mmm'cr' >add/ADRx_nnnn_mmm.mmm'cr''lf']

<add/ADRx_'cr' >add/ADRx_nnnn_mmm.mmm'cr''lf']

<add/SDRx_'cr' >add/SDRx_'cr''lf']

See DR command. <add/SDRV_nnnn_mmm.mmm'cr'

>add/SDRV_nnnn_mmm.mmm'cr''lf'] See DR command.

Where: nnn.nnnn = Frequency in MHz, 50.0000 to

180.0000, in 2.5 kHz steps.

Where:

x = A, B, C, D, or V (Preset designator). nnnn = 1/2, 3/4, 7/8, or BP12 (Dec oder rate). mmm.mmm = Data rate in kHz.

Notes:

1. When ADPCM Interface is selected, only 32.000 and

64.000 are allowed.

2. When the Async Interface is used. I f the ASYNC baud rate is higher than allowable for the new data rate, the maximum baud rate will be select ed automatically.

Where: x = A, B, C, D, or V (Preset designator).

Where:

nnnn = 1/2, 3/4, 7/8, or BP12 (Dec oder rate). mmm.mmm = Data rate in kHz.

Notes:

1. When ADPCM Interface is selected, only 32.000 and

64.000 are allowed.

2. When the Async Interface is used. I f the ASYNC baud rate is higher than allowable for the new data rate, the maximum baud rate will be select ed automatically.

Descramble Enable

Differential Decoder Enable

RF Loopback

IF Loopback

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/DE_xxx'cr' >add/DE_xxx'cr''lf']

<add/DE_'cr' >add/DE_xxx'cr''lf']

<add/DDEC_xxx'cr' >add/DDEC_xxx'cr''lf']

<add/DDEC_'cr' >add/DDEC_xxx'cr''lf']

<add/RFL_xxx'cr' >add/RFL_xxx'cr''lf']

<add/RFL_'cr' >add/RFL_xxx'cr''lf']

<add/IFL_xxx'cr' >add/IFL_xxx'cr''lf']

<add/IFL_'cr' >add/IFL_xxx'cr''lf']

Where: xxx = ON or OFF.

Rev. 1 A–7

Remote Control Operation SNM-1001 Network Control Modem

Sweep Center Frequency

Sweep Width Range

Bit Error Rate Threshold

Demod Type

Demod Decoder Type

Receive BPSK Data Ordering

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/SCF_snnnnn'cr' >add/SCF_snnnnn'cr''lf']

<add/SCF_'cr' >add/SCF_snnnnn'cr''lf']

<add/SWR_nnnnn'cr' >add/SWR_nnnnn'cr''lf']

<add/SWR_'cr' >add/SWR_nnnnn'cr''lf']

<add/BERT_xxxx'cr' >add/BERT_xxxx'cr''lf']

<add/BERT_'cr' >add/BERT_xxxx'cr''lf']

<add/DT_xxxx'cr' >add/DT_xxxx'cr''lf']

<add/DDT_xxx'cr' >add/DDT_xxx'cr''lf']

<add/RDA_xxx'cr' >add/RDA_xxx'cr''lf']

Where: snnnnn = -35000 to +35000, i n 1 Hz steps.

Where: nnnnn = 0 to 70000, in 1 Hz steps.

Where: xxxx = NONE, or 1 E

-n

(where n = 3, 4, 5, 6, 7, or 8).

Where: xxxx = INTL (INTELSAT OP EN NETWORK), EFD (COMTECH EFDATA CLOSED NETWORK), CSC (COMSTREAM CLOSED NETWORK), or FDC (FAIRCHILD CLOSED NETWORK).

Where: xxx = VIT (K-7 VITERBI ENCOD ER) or SEQ (SEQUENTIAL ENCODER).

Where: xxx = NRM (STANDARD) or INV (NON STANDARD).

Demod Spectrum Rotation

ReedSolomon Decoder Enable

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/DSR_xxxx'cr' >add/DSR_xxxx'cr''lf']

<add/DSR_'cr' >add/DSR_xxxx'cr''lf']

<add/RSDE_xxx'cr' >add/RSDE_xxx'cr'lf']

<add/RSDE_'cr' >add/RSDE_xxx'cr'lf']

Where: xxxx = NRM (n ormal spectrum) o r INV (inve rted spectrum).

Where: xxx = ON, OFF, or COR R_OFF

A–8 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

A.3.3 Interface

Transmit Clock

Transmit Clock Phase

Buffer Clock Command:

Receive Clock Phase

Baseband Loop Back

Interface Buffer Size

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Response: Status:

Response: Command:

Response: Status:

Response: Command:

Response: Status:

Response:

<add/TC_xxx'cr' >add/TC_xxx'cr''lf']

<add/TC_'cr' >add/TC_xxx'cr''lf']

<add/TCP_xxxx'cr' >add/TCP_xxxx'cr''lf']

<add/TCP_'cr' >add/TCP_xxxx'cr''lf']

<add/BC_xxx'cr' >add/BC_xxx'cr''lf']

<add/BC_'cr' >add/BC_xxx'cr''lf']

<add/RCP_xxxx'cr' >add/RCP_xxxx'cr''lf']

<add/RCP_'cr' >add/RCP_xxxx'cr''lf']

<add/BBL_xxx'cr' >add/BBL_xxx'cr''lf']

<add/BBL_'cr' >add/BBL_xxx'cr''lf']

Where: xxx = INT (internal SCT c lock), EXT (external TX terrestrial clock), or SAT (receive satellite clock).

Where: xxxx = NRM (n ormal clock phasi ng), INV (inverted clock phasing), or AUTO (automatic clock phasing).

Where: xxx = INT (internal SCT c lock), EXT (external TX terrestrial clock), SAT (receive satellite clock), or REF (external reference clock).

Where: xxxx = NRM (n ormal clock phasi ng) or INV (inverted clock phasing).

Where: xxx = ON or OFF.

Buffer size programming is supported in two formats; bits, or milli-seconds. The select ed format must be chosen using the buffer programming command (IBP_).

Interface Buffer Size (Bit Format)

Interface Buffer Size (Millisecond Format)

Interface Buffer Center

Interface Buffer Program

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/IBS_nnnnn'cr' >add/IBS_nnnnn'cr''lf']

<add/IBS_'cr' >add/IBS_nnnnn'cr''lf']

<add/IBS_nn'cr' >add/IBS_nn'cr''lf']

<add/IBS_'cr' >add/IBS_nn'cr''lf']

<add/IBC_'cr' >add/IBC_'cr''lf']

<add/IBP_xxx'cr' >add/IBP_xxx'cr''lf']

<add/IBP_'cr' >add/IBP_xxx'cr''lf']

Where: nnnnn = 64 to 65536, in 16 bi t i ncrements.

Where: nn = 0 to 50 (buffer s i ze in milli-seconds).

Where: xxx = BIT S or MS (milli-seconds).

Rev. 1 A–9

Remote Control Operation SNM-1001 Network Control Modem

Interface ADPCM Program

Interface Subscriber/ Trunk Emulation

E & M Signal Type

Interface Encoding Law

Off Hook Alert Enable

Interface Service Channel Level

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/ADP_xxx'cr' >add/ADP_xxx'cr''lf']

<add/ADP_'cr' >add/ADP_xxx'cr''lf']

<add/SBTR_xxx'cr' >add/SBTR_xxx'cr''lf']

<add/SBTR_'cr' >add/SBTR_xxx'cr''lf']

<add/EMS_n'cr' >add/EMS_n'cr''lf']

<add/EMS_'cr' >add/EMS_n'cr''lf']

<add/LAW_y'cr' >add/LAW_y'cr''lf']

<add/LAW_'cr >add/LAW_y'cr''lf']

<add/HOOK_xxx'cr' >add/HOOK_xxx'cr''lf']

<add/HOOK_'cr >add/HOOK_xxx'cr''lf']

<add/ISCL_xx_nnn'cr' >add/ISCL_xx_nnn'cr''lf']

<add/ISCL_xx'cr' >add/ISCL_xx_nnn'cr''lf']

Where: xxx = ON or OFF. Note: Only valid when ADPCM board is installed.

Where: xxx = SUB or TRK. Note: Only valid when ADPCM board is installed.

Where: n = 1 to 5, in steps of 1. Note: Only valid when ADPCM board is installed.

Where: y = A (A-Law) or U (u-Law).

Where: xxx = ON or OFF. Note: Only valid when ADPCM board is installed.

Where:

xx = TX or RX (service channel designator). nnn = -20 to +10, in steps of 1 (servi ce channel level in dBm).

Note: Only valid when ADPCM board is installed.

Interface RD Signal

Interface SD Signal

Interface RR Signal

Interface DM Signal

Interface ASYNC Communications Program

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/RD_xxx'cr' >add/RD_xxx'cr''lf']

<add/RD_'cr' >add/RD_xxx'cr''lf']

<add/SD_xxx'cr' >add/SD_xxx'cr''lf']

<add/SD_'cr' >add/SD_xxx'cr''lf']

<add/RR_xxx'cr' >add/RR_xxx'cr''lf']

<add/RR_'cr' >add/RR_xxx'cr''lf']

<add/DM_xxx'cr' >add/DM_xxx'cr''lf']

<add/DM_'cr' >add/DM_xxx'cr''lf']

<add/ACP_xxx'cr' >add/ACP_xxx'cr''lf']

<add/ACP_'cr' >add/ACP_xxx'cr''lf']

Where: xxx = NRM or INV. Note: Only valid when ADPCM board is installed.

Where: xxx = ON or OFF.

Note: Only valid when ASYNC board is installed.

A–10 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

ASYNC Transmit Overhead Baud Rate

ASYNC Receive Overhead Baud Rate

ASYNC Transmit Channel Character Length

ASYNC Receive Channel Character Length

ASYNC Transmit Channel Stop Bits

ASYNC Receive Channel Stop Bits

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/TOBR_nnnnn'cr' >add/TOBR_nnnnn'cr''lf']

<add/TOBR_'cr' >add/TOBR_nnnnn'cr''lf']

<add/ROBR_nnnnn'cr' >add/ROBR_nnnnn'cr''lf']

<add/ROBR_'cr' >add/ROBR_nnnnn'cr''lf']

<add/TCCL_n'cr' >add/TCCL_n'cr''lf']

<add/TCCL_'cr' >add/TCCL_n'cr''lf']

<add/RCCL_n'cr' >add/RCCL_n'cr''lf']

<add/RCCL_'cr' >add/RCCL_n'cr''lf']

<add/TOSB_n'cr' >add/TOSB_n'cr''lf']

<add/TOSB_'cr' >add/TOSB_n'cr''lf']

<add/RCSB_n'cr' >add/RCSB_n'cr''lf']

<add/RCSB_'cr' >add/RCSB_n'cr''lf']

Where: nnnnn = 150, 300, 600, 1200, or 2400. Note: Only valid when ASYNC board is installed with ASYNC

enabled.

Where: nnnnn = 150, 300, 600, 1200, or 2400. Note: Only valid when ASYNC board is installed with ASYNC

enabled.

Where: n = 5, 6, 7, or 8 (characters). Note: Only valid when ASYNC board is installed with ASYNC

enabled.

Where: n = 5, 6, 7, or 8 (characters). Note: Only valid when ASYNC board is installed with ASYNC

enabled.

Where: n = 1 or 2 (stop bits). Note: Only valid when ASYNC board is installed with ASYNC

enabled.

Where: n = 1 or 2 (stop bits). Note: Only valid when ASYNC board is installed with ASYNC

enabled.

ASYNC Transmit Overhead Channel Parity

ASYNC Receive Overhead Channel Parity

Interface Loop Timing ASYNC Overhead Communications Type

Interface Wire Type

Terrestrial Communications Type

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/TOCP_xxxx'cr' >add/TOCP_xxxx'cr''lf']

<add/TOCP_'cr' >add/TOCP_xxxx'cr''lf']

<add/ROCP_xxxx'cr' >add/ROCP_xxxx'cr''lf']

<add/ROCP_'cr' >add/ROCP_xxxx'cr''lf']

<add/ILT_xxx'cr' >add/ILT_xxx'cr''lf']

<add/OCT_xxxxx'cr' >add/OCT_xxxxx'cr''lf']

<add/OCT_'cr' >add/OCT_xxxxx'cr''lf']

<add/IWT_xxxxxxx'cr' >add/IWT_xxxxxxx'cr''lf']

<add/TCT_xxxxx'cr' >add/TCT_xxxxx'cr''lf']

<add/TCT_'cr' >add/TCT_xxxxx'cr''lf']

Where: xxxx = ODD, EVEN, or NONE. Note: Only valid when ASYNC board is installed with ASYNC

enabled.

Where: xxxx = ODD, EVEN, or NONE. Note: Only valid when ASYNC board is installed with ASYNC

enabled.

Where: xxx = ON or OFF.

Where: xxxxx = RS232 or RS485.

Note: Only valid when ASYNC board is installed.

Where: xxxxxxx = 2_WIRE or 4_WIRE. Note: Only valid when ASYNC board is installed. Where: xxxxx = RS422 or V.35. Note: Only valid when ASYNC board is installed.

Rev. 1 A–11

Remote Control Operation SNM-1001 Network Control Modem

Interface SD Signal Command

Interface RS Signal Command

Interface MC Signal Command

Interface TT Signal Command

Interface RD Signal Command

Interface RR Signal Command

Interface DM Signal Command

Interface CS Signal Command

Command: Response:

<add/ISSD_xxx'cr' >add/ISSD_xxx'cr''lf']

<add/ISRS_xxx'cr' >add/ISRS_xxx'cr''lf']

<add/ISMC_xxx'cr' >add/ISMC_xxx'cr''lf']

<add/ISTT_xxx'cr' >add/ISTT_xxx'cr''lf']

<add/ISRD_xxx'cr' >add/ISRD_xxx'cr''lf']

<add/ISRR_xxx'cr' >add/ISRR_xxx'cr''lf']

<add/ISDM_xxx'cr' >add/ISDM_xxx'cr''lf']

<add/ISCS_xxx'cr' >add/ISCS_xxx'cr''lf']

Where: xxx = NRM or INV. Note: Only valid when ASYNC board is installed. Where: xxx = NRM or INV. Note: Only valid when ASYNC board is installed. Where: xxx = NRM or INV. Note: Only valid when ASYNC board is installed. Where: xxx = NRM or INV. Note: Only valid when ASYNC board is installed. Where: xxx = NRM or INV. Note: Only valid when ASYNC board is installed. Where: xxx = NRM or INV. Note: Only valid when ASYNC board is installed. Where: xxx = NRM or INV. Note: Only valid when ASYNC board is installed. Where: xxx = NRM or INV. Note: Only valid when ASYNC board is installed.

Interface RT Signal Command

Interface ST Signal Command

Command: Response:

<add/ISRT_xxx'cr' >add/ISRT_xxx'cr''lf']

<add/ISST_xxx'cr' >add/ISST_xxx'cr''lf']

Where: xxx = NRM or INV. Note: Only valid when ASYNC board is installed. Where: xxx = NRM or INV. Note: Only valid when ASYNC board is installed.

A–12 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

A.3.4 System

Time Of Day

Date Command:

Remote Command:

Clear Stored Faults Modem Operation Mode

RTS TX-IF Control Mode

Command: Response:

Status: Response:

Response: Status:

Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/TIME_hh:mmxx'cr' >add/TIME_hh:mmxx'cr''lf']

<add/TIME_'cr' >add/TIME_hh:mmxx'cr''lf']

<add/DATE_mm/dd/yy'cr' >add/DATE_mm/dd/yy'cr''lf']

<add/DATE_'cr' >add/DATE_mm/dd/yy'cr''lf']

<add/REM_'cr' >add/REM_'cr''lf']

<add/CLSF_'cr' >add/CLSF_'cr''lf']

<add/MOM_xxxxxxx'cr' >add/MOM_xxxxxxx'cr''lf']

<add/MOM_'cr' >add/MOM_xxxxxxx'cr''lf']

<add/RTSM_xxx'cr' >add/RTSM_xxx'cr''lf']

<add/RTSM_'cr' >add/RTSM_xxx'cr''lf']

Where:

hh = 1 to 12 (hours). mm = 00 to 59 (minutes). xx = AM or PM.

Where:

mm = 1 to 12 (mont h). dd = 1 to 31 (day). yy = 00 to 99 (year).

This command c onf i gures the modem for rem ote operation. The SDM100A will respond to any status request at any time. However, the SDM100A must be in 'Rem ote Mode' to change configuration parameters .

This command is used to clear all stored faults logged by the SDM100A.

Where: xxxxxxx = TX_ON LY, RX_ONLY, or D UPLEX. This command configures the modem for simplex or duplex

operation modes. When transmit only mode is selected receive faults are inhibited and when receive only mode is selected transmi t faults are inhibited.

Where: xxx = ON or OFF. This command configures the modem for t he RTS TX-IF

control mode. If "ON" is selec ted, the TX-IF output will only be turned on if the incoming RTS signal is asserted (also t he TXIF output has to be programmed ON and no major modulator faults are present). If " OFF" i s selected, the TX-IF output will operate normal ignoring the RTS si gnal .

RF Mode Control

Command: Response:

Status: Response:

<add/RFMD_xxxx'cr' >add/RFMD_xxxx'cr''lf']

Where: xxxx = NRM (N orma l Mode), PWR (Turn RF off on power up), COMM (Turn RF off on power up and loss of remote comm uni cations after 10 seconds), CD (Turn RF ON when carrier is detected, turn RF OFF when no carrier is detected. For the RF ON condition, the TX-IF must be programmed ON. Note: RTS TX-IF, when enabled over-rides CD).

This command allows f or t he RF output to be enabled or disabled depending on the following described c ondi tions. One application for this command will be in demand network systems.

A.3.5 AUPC

AUPC Local Enable

Rev. 1 A–13

Command: Response:

Status: Response:

<add/LPC_xxx'cr' >add/LPC_xxx'cr''lf']

<add/LPC_'cr' >add/LPC_xxx'cr''lf']

Where: xxx = ON or OFF. Note: When program med ON, the MOP (Modulator Output

Power) command is not all owed, only MOP status is allowed.

Remote Control Operation SNM-1001 Network Control Modem

AUPC Nominal Power Level

AUPC Maximum Power Limit

AUPC Minimum Power Limit

AUPC Eb/N Target Set Point

AUPC Maximum Tracking Rate

AUPC Local Carrier Loss Action

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/NOMP_snn.n'cr' >add/NOMP_snn.n'cr''lf']

<add/NOMP_'cr' >add/NOMP_snn.n'cr''lf']

<add/MAXP_snn.n'cr' >add/MAXP_snn.n'cr''lf']

<add/MAXP_'cr' >add/MAXP_snn.n'cr''lf']

<add/MINP_snn.n'cr' >add/MINP_snn.n'cr''lf']

<add/MINP_'cr' >add/MINP_snn.n'cr''lf']

<add/ENSP_nn.n'cr' >add/ENSP_nn.n'cr''lf']

<add/ENSP_'cr' >add/ENSP_nn.n'cr''lf']

<add/MAXT_n.n'cr' >add/MAXT_n.n'cr''lf']

<add/MAXT_'cr' >add/MAXT_n.n'cr''lf']

<add/LCL_xxxx'cr' >add/LCL_xxxx'cr''lf']

<add/LCL_'cr' >add/LCL_xxxx'cr''lf']

Where: snn.n = -30. 0 to -5.0, in 0.1 steps (nominal range in dBm).

Note: The nominal power range is modified relative to the value specified by the modulator power offset (MPO_).

Where: snn.n = -30. 0 to -5.0, in 0.1 steps (nominal range in dBm).

Note: The nominal power range is modified relative to the value specified by the modulator power offset (MPO_).

Where: snn.n = -30. 0 to -5.0, in 0.1 steps (nominal range in dBm).

Note: The nominal power range is modified relative to the value specified by the modulator power offset (MPO_).

b/N0

Where: nn.n = 3.2 t o 16. 0, in 0.1 increments (E

in dB).

Where: n.n = 0.5 t o 6. 0, in 0.5 increments (max. tracking rate in dBm/minut e).

Wh ere: xxxx = HOLD, NOM, or MA X (power level set ting when local carrier loss).

AUPC Remote Carrier Loss Action

Remote Modem AUPC Commands

Remote AUPC Enable

Remote Interface Baseband Loop Back

Command: Response:

Status: Response:

Command: Response:

Status: Response:

Command: Response:

Status: Response:

<add/RCL_xxxx'cr' >add/RCL_xxxx'cr''lf']

<add/RCL_'cr' >add/RCL_xxxx'cr''lf']

<add/RPC_xxx'cr' >add/RPC_xxx'cr''lf']

<add/RPC_'cr' >add/RPC_xxx'cr''lf']

<add/RBBL_xxx'cr' >add/RBBL_xxx'cr''lf']

<add/RBBL_'cr' >add/RBBL_xxx'cr''lf']

Wh ere: xxxx = HOLD, NOM, or MA X (power level set ting when remote carrier loss).

Notes:

1. Always wait 3 seconds between consecutive remote modem command/status polls .

2. If Local AUP C i s not enabled, status commands will return last known condition. They will also request status from the remote modem. This allows a second request to return proper status .

Where: xxx = ON, OFF, or UNK (remote AUPC enable).

Where: xxx = ON, OFF, or UNK (remote baseband loop back enable).

A–14 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

A.4 Status Commands/Responses

A.4.1 Configuration

Modulator Config Status

Command: Response:

<add/MCS_'cr' >add/MCS_'cr' RF_xxx'cr' MF_nnn.nnnn'cr' MR_nnnn_mmm.mmm'cr' AMRA_nnnn_mmm.mmm'cr' AMRB_nnnn_mmm.mmm'cr' AMRC_nnnn_mmm.mmm'cr' AMRD_nnnn_mmm.mmm'cr' AMRV_nnnn.mmm.mmm'cr' MPO_snn.n'cr' MOP_snn.n'cr' SE_xxx'cr' DENC_xxx'cr' MT_xxxx'cr' MET_xxx'cr' TDA_xxx'cr' COM_xxx'cr' RSEN_xxx'cr' MSR_xxx'cr''lf']

RF Output (ON/OFF) Modulator Frequency Modulator Rate Preset 'A' Assi gnment Preset 'B' Assi gnment Preset 'C' Assignment Preset 'D' Assignment Preset 'V' Assi gnment Modulator Power Offset Modulator Output Power Scrambler Enable (ON/OFF) Differential Encoder (ON/OFF) Modulator Type Modulator Encoder Type Transmit BPSK Data Ordering Carrier Only Mode (ON/OFF) Reed-Solomon Encoder (ON/OFF) Modulator Spectrum Rotati on

The modulator configuration status comm and causes a block of data to be returned by the addressed modem. The block of data reflects the current configuration status of the modulator module.

Rev. 1 A–15

Remote Control Operation SNM-1001 Network Control Modem

Modulator/ Coder Config Program Status

Command: Response:

<add/MCP_'cr' >add/MCP_'cr' MOM_xxxxxxx'cr' MT_xxxx'cr' MET_xxx'cr' MF_nnn.nnnn'cr' MR_nnnn_mmm.mmm'cr' MPO_snn.n'cr' MOP_snn.n'cr' (Note 1) SE_xxx'cr' DENC_xxx'cr' TDA_xxx'cr' TC_xxx'cr' TCP_xxxx'cr' BBL_xxx'cr' ADP_xxx'cr' (Note 2) SBTR_xxx'cr' (Note 2) EMS_x'cr' (Note 2) LAW_y'cr' (Note 2) ISCL_TX_nnn'cr' (Note 2) RD_xxx'cr' (Note 2) SD_xxx' cr' (Note 2) RR_xxx'cr' (Note 2) DM_xxx'cr' (Note 2) RTSM_xxx'cr' ACP_xxx'cr' (Note 3) TOBR_nnnnn'cr' (Note 4) TCCL_n'cr' (Note 4) TOSB_n'cr' (Note 4) TOSB_n'cr' (Note 4) LPC_xxx'cr' (Note 4) NOMP_snn.n'cr' (Note 5) MINP_snn.n'cr' (Note 5) MAXP_snn.n'cr' (Note 5) LCL_xxxx'cr' (Note 5 ) RCL_xxxx'cr' (Note 5) OCT_xxxxx'cr' (Note 3) TCT_xxxxx'cr' (Note 3) ISSD_xxx'c r' (Note 3) ISRS_xxx'c r' (Note 3) ISMC_xxx'cr ' (Note 3) ISTT_xxx'c r' (Note 3) RSEN_xxx'cr' MSR_xxx'cr' RF_xxx'cr''lf']

Modem Operation Mode Modulator Type Modulator Encoder Type Modulator Frequency Modulator Rate Modulator Power Offset Modulator Output Power Scrambler Enable (ON/OFF) Differential Encoder (ON/OFF) Transmit BPSK Data Ordering Transmit Clock (S ource) Transmit Clock P hase Baseband Loopback Interface ADPCM Programming Interface Subscriber/ T runk Emulation Interface E&M Signal Type Interface Transmit Encoding Law Interface Transmit Service Channel Level Interface RD Signal Interface SD Signal Interface RR Signal Interface DM Signal RTS TX-IF Control Mode Interface ASYNC Programming ASYNC Transmit Overhead B aud Rat e ASYNC Transmit Channel Character Length ASYNC Transmit Channel Stop Bits ASYNC Transmit Overhead Channel Parity AUPC Local Enable AUPC Nominal Power Value AUPC Minimum Power Value AUPC Maximum Power Value AUPC Local Carrier Loss AUPC Remote Carrier Loss ASYNC Overhead Communic ations Type Terrestrial Communications Type ASYNC Interface SD S i gnal ASYNC Interface RS Signal ASYNC Interface MC Signal ASYNC Interface TT Signal Reed-Solomon Encoder (ON/OFF) Modulator Spectrum Rotati on RF Output (ON/OFF)

This command is used by the Comtech EFData M:N protection switch to collect i nformation that is nec essary to configure back-up modems.

Notes:

1. Status only returned when AUPC option is not enabled.

2. Status only returned when ADPCM board is installed.

3. Status only returned when ASYNC board is installed.

4. Status only returned when ASYNC option is enabled.

5. Status not returned when local AUPC is enabled.

A–16 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

Demodulato r Config Status

Command: Response:

<add/DCS_'cr' >add/DCS_'cr' DF_nnn.nnnn'cr' DR_nnnn_mmm.mmm'cr' ADRA_nnnn_mmm.mmm'cr' ADRB_nnnn_mmm.mmm'cr' ADRC_nnnn_mmm.mmm'cr' ADRD_nnnn_mmm.mmm'cr' ADRV_nnnn.mmm.mmm'cr' DE_xxx'cr' DDEC_xxx'cr' RFL_xxx'cr' IFL_xxx'cr' SCF_snnnnn'cr' SWR_nnnnn'cr' BERT_xxxx'cr' DT_xxxx'cr' DDT_xxx'cr' RDA_xxx'cr' RSDE_xxx'cr' DSR_xxx'cr''lf']

Demodulator Frequency Demodulator Rate Preset 'A' Assi gnment Preset 'B' Assi gnment Preset 'C' Assignment Preset 'D' Assignment Preset 'V' Assi gnment Descrambler Enable (ON/OFF) Differential Decoder (ON/OFF) RF Loopback (ON/OFF) IF Loopback (ON/OFF) Sweep Center Frequency Sweep Width Range BER Threshold Demodulator Type Demodulator Decoder Type Receive BPSK Data Ordering Reed-Solomon Decoder Demodulator Spectrum Rotation

The demodulator configuration status comm and causes a block of data to be returned by the addres sed modem. The block of data reflect s the current configuration of the demod.

Rev. 1 A–17

Remote Control Operation SNM-1001 Network Control Modem

Demod/ Decoder Config Program Status

Command: Response:

<add/DCP_'cr' >add/DCP_'cr' MOM_xxxxxxx'cr' BERT_xxxx'cr' DT_xxxx'cr' DDT_xxx'cr' DF_nnn.nnnn'cr' DR_nnnn_mmm.mmm'cr' DE_xxx'cr' DDEC_xxx'cr' RFL_xxx'cr' IFL_xxx'cr' SCF_snnnnn'cr' SWR_nnnnn'cr' RDA_xxx'cr' BC_xxx'cr' RCP_xxxx'cr' (Note 1) BBL_xxx'cr' IBP_xxx'cr' IBS_nnnnn'cr' ADP_xxx'cr' (Note 2) SBTR_xxx'cr' (Note 2) EMS_x'cr' (Note 2) LAW_y'cr' (Note 2) ISCL_RX_nnn'cr' (Note 2) RD_xxx'cr' (Note 2) SD_xxx' cr' (Note 2) RR_xxx'cr' (Note 2) DM_xxx'cr' (Note 2) ROBR_nnnnn'cr' (Note 3) RCCL_n'cr' (Note 3) ROCP_xxxx'cr ' (Note 3) LPC_xxx'cr' (Note 3) ENSP_nn.n'cr' (Note 4) MAXT_n.n'cr' (Note 4) OCT_xxxxx'cr' (Note 5) TCT_xxxxx'cr' (Note 5) ISRD _xxx'cr ' (Note 5) ISRR _xxx'cr ' (Note 5) ISDM_xxx'cr ' (Note 5) ISCS_xxx'c r' (Note 5) ISRT_xxx'cr' (No te 5) ISST_xxx'cr' (Note 5) RSDE_xxx'cr' DSR_xxx'cr''lf']

Modem Operation Mode BER Threshold Demodulator Type Demodulator Decoder Type Demodulator Frequency Demodulator Rate Descrambler Enable (ON/OFF) Differential Decoder (ON/OFF) RF Loopback (ON/OFF) IF Loopback (ON/OFF) Sweep Center Frequency Sweep Width Range Receive BPSK Data Ordering Buffer Clock (Source ) Receive Clock Phase Baseband Loop Back Interface Buffer Programming Interface Buffer Size Interface ADPCM Programming Interface Subscriber/ T runk Emulation Interface E&M Signal Type Interface Receive Encoding Law Interface Service Rece i ve Channel Level Interface RD Signal Interface SD Signal Interface RR Signal Interface DM Signal ASYNC Receive Overhead Baud Rate ASYNC Receive Channel Character Length ASYNC Receive Overhead Channel Parity AUPC Local Enable

b/N0

AUPC E

Target Set Point AUPC Max. Tracking Rate ASYNC Overhead Communic ations Type Terrestrial Communications Type ASYNC Interface RD Si gnal ASYNC Interface RR Si gnal ASYNC Interface DM Signal ASYNC Interface CS Signal ASYNC Interface RT Si gnal ASYNC Interface ST S ignal Reed-Solomon Decoder Demodulator Spectrum Rotation

This command is used by the Comtech EFData M:N protection switch to collect i nformation that is nec essary to configure back-up modems.

Notes:

1. Status only returned when ASYNC board is installed.

2. Status only returned when ADPCM board is installed.

3. Status only returned when ASYNC option is enabled.

4. Status only returned when AUPC option is enabl ed.

5. Status only returned when ASYNC option is not enabled.

A–18 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

Interface Config Status

Command: Response:

<add/ICS_'cr' >add/ICS_'cr' TC_xxx'cr' TCP_xxxx'cr' RCP_xxxx'cr' ( Note 5) BBL_xxx'cr' BC_xxx'cr' IBP_xxx'cr' IBS_nnnnn'cr' ADP_xxx'cr' (Note 1 ) SBTR_xxx'cr' (Note 1) EMS_x'cr' (Note 1) LAW_y'cr' (Note 1) HOOK _xxx'cr' (Note 1) ISCL_TX_nnn'cr' (Note 1) ISCL_RX_nnn'cr' (Note 1) RD_xxx'cr' (Note 1) SD_xxx' cr' (Note 1) RR_xxx'cr' (Note 1) DM_xxx'cr' (Note 1) ALBJ_xxx'c r' (Not e 1) RTSM_xxx'cr' ILT_ xxx'cr' (Note 2) TOBR_nnnnn'cr' (Note 2) TCCL_n'cr' (Note 2) TOSB_n'cr' (Note 2) TOCP _xxxx'cr ' (Note 2) ROBR_nnnnn'cr' (Note 2) RCCL_n'cr' (Note 2) ROCP_xxxx'cr ' (Note 2) LPC_xxx'cr' (Note 2) NOMP_snn.n'cr' (Note 3) MINP_snn.n'cr' (Note 3) MAXP_snn.n'cr' (Note 3) LCL_xxxx'cr' (Note 3) RCL_xxxx'cr' (Note 3) ENSP_nn.n'cr' (Note 3) MAXT_n.n'cr' (Note 3) OCT_xxxxx'cr' (Note 4) TCT_xxxxx'cr' (Note 4 ) ISSD_xxx'c r' (Note 4) ISRS_xxx'c r' (Note 4) ISMC_xxx'cr ' (Note 4) ISTT_xxx'c r' (Note 4) ISRD _xxx'cr ' (Note 4) ISRR _xxx'cr ' (Note 4) ISDM_xxx'cr ' (Note 4) ISCS_xxx'c r' (Note 4) ISRT_xxx'cr' (Note 4) ISST_xxx'cr''lf'] (Note 4)

Transmit Clock (S ource) Transmit Clock P hase Receive Clock Phase Baseband Loop Back Buffer Clock (Source ) Interface Buffer Programming Interface Buffer Size Interface ADPCM Programming Interface Subscriber/ T runk Emulation Interface RD Signal Interface Transmit Encoding Law Interface Off Hook Al ert Enable Interface Transmit Service Channel Level Interface Receive Servic e Channel Level Interface RD Signal Interface SD Signal Interface RR Signal Interface DM Signal Interface Analog Loopback Jumper Status RTS TX-IF Control Mode Interface Loop Timing ASYNC Transmit Overhead B aud Rat e ASYNC Transmit Channel Character Length ASYNC Transmit Channel Stop Bits ASYNC Transmit Overhead Channel Parity ASYNC Receive Overhead Baud Rate ASYNC Receive Channel Character Length ASYNC Receive Overhead Channel Parity AUPC Local Enable AUPC Nominal Power Value AUPC Minimum Power Value AUPC Maximum Power Value AUPC Local Carrier Loss AUPC Remote Carrier Loss

b/N0

AUPC E

Target Set Point AUPC Max. Tracking Rate ASYNC Overhead Communic ations Type Terrestrial Communications Type ASYNC Interface SD S i gnal ASYNC Interface RS Signal ASYNC Interface MC Signal ASYNC Interface TT Signal ASYNC Interface RD Si gnal ASYNC Interface RR Si gnal ASYNC Interface DM Signal ASYNC Interface CS Signal ASYNC Interface RT Si gnal ASYNC Interface ST S ignal

The Interface configuration status comm and causes a block of data to be returned by the addressed modem. The block reflects the current configuration of the interface.

Notes:

1. Status only returned when ADPCM board is installed.

2. Status only returned when ASYNC option is enabled.

3. Status only returned when AUPC option is enabl ed.

4. Status only returned when ASYNC board is installed.

Rev. 1 A–19

Remote Control Operation SNM-1001 Network Control Modem

Automatic Uplink Power Control (AUPC) Config Status

Modem Faults Status (Summary)

Modulator Status

Command: Response:

<add/ACS_'cr' >add/ACS_'cr' LPC_xxx'cr' NOMP_-nn.n'cr' MINP_-nn.n'cr' MAXP_-nn.n'cr' ENSP_n.n'cr' MAXT_n.n'cr' LCL_xxxx'cr' RCL_xxxx'cr'

<add/MFS_'cr' >add/MFS_'cr' DMD_xxx'cr' MOD_xxx'cr' ITX_xxx'cr' IRX_xxx'cr' CEQ_xxx'cr''lf']

<add/MS_'cr' >add/MS_'cr' RF_xxx'cr' MOD_xxx'cr' SYN_xxx'cr' DCS_xxx'cr' ICH_xxx'cr' QCH_xxx'cr' AGC_xxx'cr' SFLT_xx'cr''lf']

Local AUPC Enable (ON/OFF) Nominal Power Value (-5.0 to -30.0) Minimum Power Limit (-5. 0 to -30.0) Maximum Power Value (-5.0 to -30.0)

b/N0

Target Set Point (3.2 to 9.7)

E Max. Tracking Rate (0.5 to 6.0) Local Carrier Loss (HOLD, NOM, MAX) Remote Carrier Loss (HOLD, NOM, MAX)

The interface (AUPC) configuration status com mand causes a block of data to be returned by the addres sed modem. The block reflects t he current configuration of the interface.

Demodulator (FLT/OK) Modulator (FLT/OK) Interface Transmit Side (FLT/OK) Interface Receive Side (FLT/OK ) Common Equipment (FLT/OK)

RF Output (ON/OFF) Actual Stat us Not Config Module (OK/FLT) IF Synthesizer (OK/FLT) Data Clock Synthesizer (OK/FLT) I Channel (OK/FLT) Q Channel (OK/FLT) AGC Level (OK/FLT) Number of Stored Faults Logged (0 t o 10)

Demodulato r Status

Interface Transmit Side Status

Interface Receive Side Status

Command: Response:

<add/DS_'cr' >add/DS_'cr' MOD_xxx'cr' CD_xxx'cr' SYN_xxx'cr' ICH_xxx'cr' QCH_xxx'cr' DSCR_xxx'cr' BERT_xxx'cr' SFLT_xx'cr''lf']

<add/ITXS_'cr' >add/ITXS_'cr' CLK_xxx'cr' TAC_ xxx'cr' (See Note) SFLT_xx'cr''lf']

<add/IRXS_'cr' >add/IRXS_'cr' CLK_xxx'cr' UNFL_xxx'cr' OVFL_xxx'cr' RAC_xxx'cr' (See Not e) DMXL_xxx'cr' (See Note ) SFLT_xx'cr''lf']

Demod Module (OK/FLT) Carrier Detect (OK/FLT) IF Synthesizer Lock (OK/FLT) I Channel (OK/FLT) Q Channel (OK/FLT) Descrambler (OK/FLT) BER Threshold (OK/FLT) Number of Stored Faults Logged (0 t o 10)

Selected Transmit Cl ock Activity (OK/FLT) Transmit Audio Clip (OK/FLT) Number of Stored Faults Logged (0 t o 10)

Note: Status only returned when ADPCM board is i nstalled.

Selected Buffer Clock Activity (OK/FLT) Buffer Underflow (OK/FLT) Buffer Overflow (OK/FLT) Receive Audio Clip (OK/FLT) Demultiplexer Lock (OK/FLT) Number of Stored Faults Logged (0 t o 10)

Note: Status only returned when ADPCM board is i nstalled.

A–20 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

Common Equipment

Command: Response:

Status

Eb/N0 Status Command:

Response:

Modulator Rate Status

Command: Response:

<add/CES_'cr' >add/CES_'cr' M&C_xxx'cr' INT_xxx'cr' BAT_xxx'cr' +5_xxx'cr' +12_xxx'cr'

-12_xxx'cr' MODE_xxxxxx'cr' SFLT_xx'cr''lf']

<add/EBN0_'cr' >add/EBN0_xnn.ndB'cr''lf']

<add/MR_'cr' >add/MR_nnnn_mmm.mmm'cr''lf']

Monitor & Control Module (OK/FLT) Data Interface Module (OK/FLT) Battery/Clock (OK/FLT) +5V Power Supply (OK/FLT) +12V Power Supply (OK/FLT)

-12V Power Supply (OK/FLT) Mode (LOCAL or REMOTE) Number of Stored Faults Logged (0 t o 10)

The common equipment status command causes a block of data to be returned which indicates the status of the com mon equipment.

Where:

x = < or > (data modifier to indicate that the E

b/N0

is less

than or greater than the returned value).

b/N0

nn.n = 1.0 to 99.9 ( E

value).

Notes:

1. The 'x' (< or >) parameter is onl y returned if the E

b/N0

has exceeded the computational resolution of the system.

b/N0

2. "No Data" is ret urned i f the E

cannot be calculated.

3. "Sampli ng" i s returned if not enough data is current l y

b/N0

available to calculate the E

Where:

nnnn = 1/2, 3/4, 7/8, or BP12 (Coder rat e). mmm.mmm = Data rate in kHz.

Demodulato r Rate Status

Receive Signal Level Status

Command: Response:

<add/DR_'cr' >add/DR_nnnn_mmm.mmm'cr''lf']

<add/RSL_'cr' >add/RSL_xsnn.ndBm'cr''lf']

Where:

nnnn = 1/2, 3/4, 7/8, or BP12 (Dec oder rate). mmm.mmm = Data rate in kHz.

Where:

x = < or > (data modifier to indicate that the receive signal level is less than or greater than the returned value).

s = + or - (receive signal level sign, pl us or minus). nn.n = 0.0 to 99.9 (receive signal level magnitude).

Notes:

1. The 'x' (< or >) parameter is onl y returned if the level has exceeded the computational resolution of the system.

2. "No Data" is ret urned i f the level cannot be calculated.

3. "Sampli ng" i s returned if not enough data is current l y available to calculate t he l evel .

Rev. 1 A–21

Remote Control Operation SNM-1001 Network Control Modem

Current Sweep Value

Interface Analog Loopback Jumper Status

Command: Response:

Status: Response:

<add/CSV_'cr' >add/CSV_snnnnn'cr''lf']

<add/ALBJ_'cr' >add/ALBJ_xxx'cr''lf']

Where:

x = < or > (data modifier to indicate that the sweep offset value is less than or greater than the returned value).

s = + or - (sweep offset from c enter). nnnnn = 0 to 35000.

Notes:

1. This command returns the current sweep offset value.

2. The 'x' (< or >) parameter is onl y returned if the level has exceeded the computational res ol ution of the system.

3. "No Data" is ret urned i f the level cannot be calculated.

4. "Sampli ng" i s returned if not enough data is current l y available to calculate t he l evel .

Where: xxx = ON or OFF. Note: Only valid when ADPCM board is installed.

A–22 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

Bulk Consol Analog

Command: Response:

<add/BCAS_'cr' >add/BCAS_p1,p2,p3, . . . pn'cr''lf']

This command is similar to the 'B CS_' command but, returns modem analog parameters.

Status Where 'pn' is t he l ast parameter returned.

Parameter

Number

Parameter Name

(Command Reference)

Receive Signal Level

Description

p1 = xsnn.n, receive signal level in dBm.

(ref. "RSL_" command).

Raw BER

p2 = xm.m

-ee

(ref. "RBER_" com mand).

Corrected BER

p3 = xm.m

-ee

(ref. "CBER_" com mand).

b/N0

p4 = xnn.n, E

b/N0

in dB.

(ref. "EBN0_" com mand).

Current Sweep Value

p5 = snnnnn, sweep offset value in Hz.

(ref. "CSV_" com mand).

Note: Parameters 2 through 5 are dependent on carrier acquisition, i f the decoder is not locked empty data blocks are returned (,,,,).

Rev. 1 A–23

Remote Control Operation SNM-1001 Network Control Modem

Bulk Consol Status

Where 'pn' is t he l ast parameter returned.

Command: Response:

Parameter

Number

<add/BCS_'cr' >add/BCS_p1,p2,p3, . . . pn'cr''lf']

Parameter Name

(Command Reference)

Modulator RF output

(ref. "RF_" comm and).

Modulator IF frequency

(ref. "MF_" command).

Modulator rate

(ref. "MR_" comm and).

Modulator preset 'A' assignment

(ref. "ARMA_" com mand).

Modulator preset 'B' assignment

(ref. "ARMB_" com mand).

Modulator preset 'C' assignment

(ref. "ARMC_" command).

Modulator preset 'D' assignment

(ref. "ARMD_" command).

Modulator preset 'V' assignment

(ref. "ARMV_" com mand).

Modulator power offset

(ref. "MPO_" command).

Modulator output power level

(ref. "MOP_" comm and).

Scrambler enable

(ref. "SE_" com mand).

Differential encoder enable

(ref. "DENC_" command).

Modulator type

(ref. "MT_" command).

Modulator encoder type

(ref. "MET_" command).

Transmit BPSK Data Ordering

(ref. "TDA_" com mand).

Carrier only mode ON/OFF.

This command causes bulk modem s tatus to be returned. To reduce the length of the response, message parameter data are returned without identifiers. However, parameter identification can be det ermined by order of return. Each status parameter is terminated with a ',' (c omma) except for the last parameter which has the standard message termination sequence ('cr''lf']). Most of t he data returned is formatted the same way as the single command status request (refer to the appropriate portions of this document i n preceding sections).

Description

p1 = n, where 'n' is '0' (off) or '1' (on).

p2 = nnn.nnnn, IF frequency in MHz.

p3 = nnnn_mmm.mmm, code rate/data rate in kbit/s.

p4 = nnnn_mmm.mmm, code rate/data rate in kbit/s.

p5 = nnnn_mmm.mmm, code rate/data rate in kbit/s.

p6 = nnnn_mmm.mmm, code rate/data rate in kbit/s.

p7 = nnnn_mmm.mmm, code rate/data rate in kbit/s.

p8 = nnnn_mmm.mmm, code rate/data rate in kbit/s.

p9 = snn.n, modulator power offset in dB.

p10 = snn.n, transmit ter output power level in dBm.

p11 = n, where 'n' is '0' (off) or '1' (on).

p12 = n, where 'n' is '0' (off) or '1' (on).

p13 = n, where 'n' is '0' (EFD), '1' (INTL), '2' (CSC), '3' (FDC), or 4 (SDM51).

p14 = n, where 'n' is '0' (SEQ) or '1' (V I T ).

p15 = n, where 'n' is '0' (NRM) or '1' (INV).

p16 = n, where 'n' is '0' (off) or '1' (on).

A–24 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

Bulk Consol Status (Continued)

Parameter

Number

Parameter Name

(Command Reference)

Demodulator IF frequency

(ref. "DF_" comm and).

Demodulator rate

(ref. "DR_" command).

Demodulator preset A assignment

(ref. "ADRA_" command).

Demodulator preset B assignment

(ref. "ADRB_" command).

Demodulator preset C assignment

(ref. "ADRC_" command).

Demodulator preset D assignment

(ref. "ADRD_" command).

Demodulator preset V assignment

(ref. "ADRV_" command).

Descrambler enable

(ref. "DE_" command).

Differential decoder enable

(ref. "DDEC_" command).

RF loopback

(ref. "RFL_" comm and).

IF loopback

(ref. "IFL_" command).

Sweep center frequency

(ref. "SCF_" command).

Sweep width range

(ref. "SWR_" command).

BER threshold

(ref. "BERT_" command).

Demodulator type

(ref. "DT_" comm and).

Demodulator decoder type

(ref. "DDT_" comm and). Receive BPSK Data Ordering

(ref. "RDA_" command).

Transmit clock source

(ref. "TC_" command).

Transmit clock phase

(ref. "TCP_" com mand).

Description

p17 = nnn.nnnn, demodulator IF f requenc y in MHz.

p18 = nnnn_mmm.mmm, code rate/data rate in kbit/s.

p19 = nnnn_mmm.mmm, code rate/data rate in kbit/s.

p20 = nnnn_mmm.mmm, code rate/data rate in kbit/s.

p21 = nnnn_mmm.mmm, code rate/data rate in kbit/s.

p22 = nnnn_mmm.mmm, code rate/data rate in kbit/s.

p23 = nnnn_mmm.mmm, code rate/data rate in kbit/s.

p24 = n, where 'n' is '0' (off) or '1' (on).

p25 = n, where 'n' is '0' (off) or '1' (on).

p26 = n, where 'n' is '0' (off) or '1' (on).

p27 = n, where 'n' is '0' (off) or '1' (on).

p28 = snnnnn, sweep center frequency in Hz.

p29 = nnnnn, sweep range in Hz.

p30 = xxxx, BER threshold.

p31 = n, where 'n' is '0' (EFD), '1' (INTL), '2' (CSC), or '3' (FDC).

p32 = n, where 'n' is '0' (SEQ) or '1' (V I T ).

p33 = n, where 'n' is '0' (NRM) or '1' (INV).

p34 = n, where 'n' is '0' (INT), '1' (REF ), or '2' (EXT).

p35 = n, where 'n' is '0' (NRM), '1' (INV), or ' 2' (AUTO).

Rev. 1 A–25

Remote Control Operation SNM-1001 Network Control Modem

Bulk Consol Status (Continued)

(Note 1)

Parameter

Number

Parameter Name

(Command Reference)

Buffer clock source

(ref. "BC_" command).

Receive clock phase

(ref. "RCP_" command).

Baseband loopback

(ref. "BBL_" com mand).

Interface Buffer Programming

(ref. "IBP_" command).

Interface buffer size

(ref. "IBS_" command).

Modem operation mode

(ref. "MOM_" command).

MODEM REMOTE/LOCAL mode.

ADPCM Interface Programming

(ref. "APD_" com mand)

ADPCM Subscriber/Trunk Emulation

(ref. "SBTR_" command).

ADPCM E & M Signal Type

(ref. "EMS_" command).

ADPCM Encoding Law

(ref. "LAW_" command).

Off hook alert enable

(ref. "HOOK_" command).

ADPCM Transmit Service Channel

(ref. "ISCL_" com mand).

Level

ADPCM Receive Service Channel

(ref. "ISCL_" com mand).

Level ADPCM RS-422 Send Data Signal

Programming ADPCM RS-422 Receive Signal

Programming ADPCM RS-422 Receiver Ready

Signal Programming

command).

ADPCM RS-422 Data Mode Signal Programming

(ref. "SD_" command).

(ref. "RD_" command).

(ref. "RR_"

(ref. "DM_" command).

Description

p36 = n, where 'n' is '0' (INT), '1' (REF ), '2' (EXT), or '3' (SAT).

p37 = n, where 'n' is '0' (NRM) or '1' (INV).

p38 = n, where 'n' is '0' (off) or '1' (on).

p39 = n, where 'n' is '0' (BITS ) or '1' (MS).

p40 = nnnnnn, buffer size in bits or milli seconds.

p41 = n, where 'n' is '1' (TX_ONLY), '2' (RX_ONLY), or '3' (DUPLEX).

p42 = n, where 'n' is '0' (LOCAL) or '1' (REMOTE).

p43 = n, where 'n' is '0' (off) or '1' (on).

p44 = n, where 'n' is '0' (Subscriber) or '1' (Trunk).

p45 = n, where 'n' is '1', '2', '3' , '4', or '5' (signal type).

p46 = n where 'n' is 'A' (A-Law ) or 'U' (u-Law)

p47 = n, where 'n' is '0' (off) or '1' (on).

p48 = nnn, service channel level in dB m.

p49 = nnn, service channel level in dB m.

p50 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p51 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p52 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p53 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

A–26 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

Bulk Consol Status (Continued)

(Note 1)

(Note 2)

(Note 3)

(Note 2)

Parameter

Number

Parameter Name

(Command Reference)

ADPCM Audio Loopback Jumper

(ref. "ALBJ_" command).

Status RTS TX-IF Control Mode

(ref. "RTSM_" command).

ASYNC Communications programming ON/OFF

command).

Interface Loop Timing

(ref. "ILT_" command).

ASYNC TX Overhead Baud Rate

(ref. "TOBR_" command).

ASYNC TX Channel Char. Length

(ref. "TCCL_" command).

ASYNC TX Channel Stop Bits

(ref. "TCSB_" command).

ASYNC TX Channel Parity

(ref. "TOCP_" command).

ASYNC RX Overhead Baud Rate

(ref. "ROBR_" command).

ASYNC RX Channel Char. Length

(ref. "RCCL_" command).

ASYNC RX Channel Parity

(ref. "ROCP_" command).

ASYNC Overhead Communications

(ref. "OCT_" command).

Type Interface Wire Type

(ref. "IWt_" command).

Terrestrial Communications Type

(ref. "TCT_" command).

ASYNC Interface SD Signal

(ref. "ISD_" com mand).

ASYNC Interface RS Signal

(ref. "ISD_" com mand).

ASYNC Interface MC Signal

(ref. "IMC_" command).

ASYNC Interface TT Signal

(ref. "ITT_" command).

(ref. "ASP_"

Description

p54 = n, where 'n' is '0' (off) or '1' (on).

p55 = n, where 'n' is '0' (off) or '1' (on).

p56 = n, where 'n' is '0' (off) or '1' (on).

p57 = n, where 'n' is '0' (off) or '1' (on).

p58 = nnnnn, where 'nnnnn' is the currently programmed baud rate.

p59 = n, where 'n' is the currently programmed character length.

p60 = n, where 'n' is the current number of stop bits programmed.

p61 = xxxx, where 'xxxx' i s the currently programmed parity.

p62 = nnnnn, where 'nnnnn' is the currently programmed baud rate.

p63 = n, where 'n' is the currently programmed character length.

p64 = xxxx, where 'xxxx' i s the currently programmed parity.

p65 = n, where 'n' is '0' (RS232) or '1' (RS485).

p66 = n, where 'n' is '2' (2-W i re) or ' 4' (4-Wire).

p67 = n, where 'n' is '0' (RS422) or '1' (V.35).

p68 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p69 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p70 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p71 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

Rev. 1 A–27

Remote Control Operation SNM-1001 Network Control Modem

Bulk Consol Status (Continued)

(Note 2)

Parameter

Number

Parameter Name

(Command Reference)

ASYNC Interface RD Signal

(ref. "IRD_" command).

ASYNC Interface RR Signal

(ref. "IRR_" command).

ASYNC Interface DM Signal

(ref. "IDM_" command).

ASYNC Interface CS Signal

(ref. "ICS_" command).

ASYNC Interface RT Signal

(ref. "IRT_" command).

ASYNC Interface ST Signal

(ref. "IST_" command).

Modulator Spectrum Rotation

(ref. "MSR_ command).

Demodulator Spectrum Rotation

(ref. "DSR_ command).

Reed-Solomon Encoder Enable

(ref "RSEN_ comm and).

Reed-Solomon Decoder Enable

(ref "RSDE_ comm and). Reserved.

Description

p72 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p73 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p74 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p75 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p76 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p77 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p78 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p79 = n, where 'n' is '0' (NORMAL) or '1' (INVERT).

p80 = n, where 'n' is '0' (off) or '1' (on).

p81 = n, where 'n' is '0' (OFF) or '1' (CORR_OFF).

Notes:

1. Status only returned when ADPCM board is installed.

2. Status only returned when ASYNC board is i nstalled.

3. Status only returned when ASYNC option i s enabled.

4. For any parameter other than the last parameter that is not returned, a comma (",") will be returned.

Reserved.

A–28 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

Change Status

Equipment Type

Monitor & Control Firmware Information

Command: Response:

<add/CS_'cr' >add/CS_x'cr''lf']

<add/ET_'cr' >add/ET_tttttttt_xxx.yyy.zzz'cr''lf']

<add/MCFI_'cr' >add/MCFI_'cr' VER_xxx.yyy.zzz'cr' FW/nnnnnn-ddr'cr' mm/dd/yy'cr''lf']

Where: The 'x' character i s defined as follows:

'@' = no change since last BCS_ and BCSF_ polls. 'A' = BCS_ response has changed since last BCS_

poll. 'B' = BCSF_ response has c hanged since last BCSF_

poll. 'C' = Both responses have changed s i nce last BCS_

and BCSF_ polls.

This command indicates that a change has or has not occurred on either the BCS_ or the BCSF_ response since the last BCS_ or BCSF_ poll .

Where:

tttttttt = Equipment type. xxx.yyy.zzz = Software versi on.

This command returns the equipment type and the software version of the addressed devi ce.

Where:

xxx.yyy.zzz = Software version number (0.0.0 to

999.999.999). nnnnnn = Firmware number (0 to 999999). dd = Firmware dash number (0 to 99).

DATA ROM Firmware Information

Interface Type

Bulk Consol Status AUPC

Command: Response:

<add/DFI_'cr' >add/DFI_'cr' DSP_FW/nnnnnn-ddr'cr' DSP_mm/dd/yy'cr' FPGA_FW/nnnnnn-ddr'cr' FPGA_mm/dd/yy'cr''lf']

<add/IT_'cr' >add/IT_ttttt'cr''lf']

<add/BCSA_'cr' >add/BCSA_p1,p2,p3, . . . pn'cr''lf']

r = Firmware revision (-, or A to Z).

Where:

nnnnnn = Firmware number (0 to 999999). dd = Firmware dash number (0 to 99). r = Firmware revision (-, or A to Z).

Where: ttt tt = RS422, V.35, RS232, A DP CM, or ASYNC. This command returns the Interface equipment type.

Rev. 1 A–29

Remote Control Operation SNM-1001 Network Control Modem

Where 'pn' is t he l ast parameter returned.

Parameter

Number

Parameter Name

(Command Reference)

Local AUPC enable ON/OFF.

Nominal Power Value.

Minimum Power Value.

Maximum Power V alue.

b/N0

Target Set Point.

Max. Tracking Rate.

Local Carrier Loss.

Remote Carrier Loss.

Description

p1 = n, where 'n' is '0' (off) or '1' (on).

p2 = snn.n, where 'snn.n' Nominal Power Value in dBm.

p3 = snn.n, where 'snn.n' Minimum Power Value in dBm.

p4 = snn.n, where 'snn.n' Maximum Power Value in dBm.

b/N0

p5 = n.n, where 'n.n' E

Target Set Point in dB.

p6 = n.n, where 'n.n' is the Max. Tracking Rate in dB / Min.

p7 = n, where 'n' is '0' (HOLD), '1' (NOMINAL), or '2' (MAXIMUM).

p8 = n, where 'n' is '0' (HOLD), '1' (NOMINAL), or '2' (MAXIMUM).

A–30 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

A.4.2 Error Performance

Raw BER Command:

Corrected BER

Response:

Command: Response:

<add/RBER_'cr' >add/RBER_xm.mE-ee'cr''lf']

<add/CBER_'cr' >add/CBER_xm.mE-ee'cr''lf']

Where:

x = < or > (data modifier to indicate that the error rate is less than or greater than the returned val ue).

m.m = 1.0 to 9.9 (error rate mantissa). ee = 1 to 99 (error rate exponent).

Notes:

1. The 'x' (< or >) parameter is only returned if t he error rate has exceeded the computational resolution of the system.

2. "No Data" is ret urned i f the error rate cannot be calculated.

3. "Sampli ng" i s returned if not enough data is current l y available to calculate t he error rat e.

Where:

x = < or > (data modifier to indicate that the error rate is less than or greater than the returned val ue).

m.m = 1.0 to 9.9 (error rate mantissa). ee = 1 to 99 (error rate exponent).

Notes:

1. The 'x' (< or >) parameter is onl y returned if the error rate has exceeded the computational resolution of the system.

2. "No Data" is ret urned i f the error rate cannot be calculated.

3. "Sampli ng" i s returned if not enough data is current l y available to calculate t he error rat e.

Rev. 1 A–31

Remote Control Operation SNM-1001 Network Control Modem

A.5 Stored Faults

Information on stored faults is returned when requested. If no stored fault exists for a given fault number, the words “NO Fault” will be returned instead of the normal time/date status information.

The following symbols are commonly used to define the stored faults status commands:

• # Fault number (0 to 9). “0” is the first fault stored.

• hh Hours in 24-hr. format.

• mm Minutes.

• ss Seconds.

• MM Month.

• DD Day.

• YY Year.

Modulator Stored Faults

Demodulato r Stored Faults

Interface Transmit Side Stored Faults

Interface Receive Side Stored Faults

Command: Response:

<add/MSF_#'cr' >add/MSF_# hh:mm:s s MM/DD/ Y Y'cr' MOD_xxx'cr' SYN_xxx'cr' DCS_xxx'cr' ICH_xxx'cr' QCH_xxx'cr' AGC_xxx'cr''lf']

<add/DSF_#'cr' >add/DSF_# hh:mm:ss MM/DD/YY'cr' MOD_xxx'cr' CD_xxx'cr' SYN_xxx'cr' ICH_xxx'cr' QCH_xxx'cr' DSCR_xxx'cr' BERT_xxx'cr''lf']

<add/ITSF_#'cr' >add/ITSF_# hh:mm:ss MM/DD/YY'cr' CLK_xxx'cr''lf'] TAC_ xxx'cr' (See Note)

<add/IRSF_#'cr' >add/IRSF_# hh:mm :ss MM/DD/YY'cr' CLK_xxx'cr' UNFL_xxx'cr' OVFL_xxx'cr''lf'] RAC_xxx'cr' (See Note ) DMXL_xxx'cr' (See Note) HOOK _xxx'cr' (See N ote)

Module (OK/FLT) IF Synthesizer (OK/FLT) Data Clock Synthesizer (OK/FLT) I Channel (OK/FLT) Q Channel (OK/FLT) AGC Level (OK/FLT)

Demod Module (OK/FLT) Carrier Detect (OK/FLT) IF Synthesizer Lock (OK/FLT) I Channel (OK/FLT) Q Channel (OK/FLT) Descrambler (OK/FLT) BER Threshold (OK/FLT)

Selected Transmit Cl ock Activity (OK/FLT) Transmit Audio Clip (OK/FLT)

Note: Status only returned when ADPCM board is installed.

Selected Buffer Clock Activity (OK/FLT) Buffer Underflow (OK/FLT) Buffer Overflow (OK/FLT) Receive Audio Clip (OK/FLT) Demultiplexer Lock (OK/FLT) Remote Off Hook Fault (OK/FLT)

Note: Status only returned when ADPCM board is installed.

A–32 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

Common Equipment Stored Faults

ReedSolomon Unavailable Seconds

Command: Response:

<add/CSF_#'cr' >add/CSF_# hh:mm:ss MM/DD/YY'cr' M&C_xxx'cr' INT_xxx'cr' BAT_xxx'cr' +5_xxx'cr' +12_xxx'cr'

-12_xxx'cr''lf'] <add/RSSF_#'cr'

>add/RSSF_# hh:mm :ss MM/DD/YY'cr' UNASEC_xxx'cr''lf']

Monitor & Control Module (OK/FLT) Data Interface Module (OK/FLT) Battery/Clock (OK/FLT) +5V Power Supply (OK/FLT) +12V Power Supply (OK/FLT)

-12V Power Supply (OK/FLT)

Unavailable Seconds (FLT/OK)

Rev. 1 A–33

Remote Control Operation SNM-1001 Network Control Modem

Bulk Consol Status Faults

Command: Response:

<add/BCSF_'cr' >add/BCSF_abcdefghijkl'cr''lf']

This command causes all modem faul t status to be returned. To reduce the length of the res ponse, fault status is embedded into the bit structure of the charact ers that are returned. Faults are indicated by a bi nary 1 i n the designated bit position.

Character 'a': Modulator fault status character 1.

Bit 6 = 1 always. Bit 5 = Modulator module fault. Bit 4 = RF output status , actual not programmed status (1 = on, 0 = off). Bit 3 through Bit 0 = Binary repres entation (0 to 10) of the number of modulator stored faults.

Character 'b': Modulator fault status character 2.

Bit 6 = 1 always. Bit 5 = IF Synthesizer. Bit 4 = Data Clock Synthesizer. Bit 5 = I Channel. Bit 2 = Q Channel. Bit 1 = AGC Level. Bit 0 = reserved.

Character 'c': Modulator fault status character 3.

Bit 6 = 1 always. Bit 5 = reserved. Bit 4 = reserved. Bit 3 = reserved. Bit 2 = reserved. Bit 1 = reserved. Bit 0 = reserved.

Character 'd': Demodulat or fault status character 1.

Bit 6 = 1 always. Bit 5 = Demod module faul t. Bit 4 = Carrier detect status (0 for decoder lock). Bit 3 through Bit 0 = Binary repres entation (0 to 10) of the number of demodulator stored faults.

Character 'e': Demodulat or fault status character 2.

Bit 6 = 1 always. Bit 5 = IF Synthesizer Lock . Bit 4 = I Channel. Bit 3 = Q Channel. Bit 2 = Descrambler. Bit 1 = BER threshold. Bit 0 = reserved.

Character 'f': Demodul at or fault status charac ter 3.

Bit 6 = 1 always. Bit 5 = reserved. Bit 4 = reserved. Bit 3 = reserved. Bit 2 = reserved. Bit 1 = reserved. Bit 0 = reserved.

Character 'g': Interfac e transmit side faul t s character 1.

Bit 6 = 1 always. Bit 5 = reserved. Bit 4 = reserved. Bit 3 through Bit 0 = Binary repres entation (0 to 10) of the number of interface t ransmit side stored faults.

A–34 Rev. 1

SNM-1001 Network Control Modem Remote Control Operation

Character 'h': Interfac e transmit side faul t s character 2.

Bit 6 = 1 always. Bit 5 = Selected Transmit Clock Acti vi ty. Bit 4 = ADPCM Transmit A udi o Cli p. (See Note) Bit 3 = reserved. Bit 2 = reserved. Bit 1 = reserved. Bit 0 = reserved.

Note: This bit will only be set if ADPCM is installed. Character 'i': Interface receive side faults c haracter 1.

Bit 6 = 1 always. Bit 5 = reserved. Bit 4 = reserved. Bit 3 through Bit 0 = Binary repres entation (0 to 10) of the number of interface receive side stored faults.

Character 'j': Interface receive side faults c haracter 2.

Bit 6 = 1 always. Bit 5 = Selected Buffer Clock Activity. Bit 4 = Buffer Underflow. Bit 3 = Buffer Overflow. Bit 2 = ADPCM Receive Audio Clip. (See Note) Bit 1 = ADPCM Demultiplexer Lock . (See Note) Bit 0 = Remote Off Hook . (See Note)

Note: These bits will only be set if ADPCM is installed. Character 'k': Common equipment fault s tatus character 1.

Bit 6 = 1 always. Bit 5 = Monitor & Control Module. Bit 4 = Interface Module. Bit 3 through Bit 0 = Binary repres entation (0 to 10) of the number of common equipment stored faults.

Character 'l': Common equipment fault status character 2.

Bit 6 = 1 always. Bit 5 = Battery/Cloc k. Bit 4 = +5V power supply. Bit 3 = +12V power supply. Bit 2 = -12V power supply. Bit 1 = reserved. Bit 0 = reserved.

Character 'm': Interface Reed-Solomon Unavailable Seconds.

Bit 6 = 1 always. Bit 5 = not used. Bit 4 = not used. Bit 3 through Bit 0 = Binary repres entation (0 to 10) of the number of Reed-Solomon Unavai l abl e S e conds stored faults.

Rev. 1 A–35

Remote Control Operation SNM-1001 Network Control Modem

This page is intentionally left blank.

A–36 Rev. 1

Glossary

The following is a list of acronyms and abbreviations that may be found in this manual.

Acronym/

Abbreviation

Ω

16QAM 16 Quadrature Amplitude Modulation

8PSK 8 Phase Shift Keying

AAmpere

A/D Analog to Digital

AC Alternating Current

ADC Analog to Digital Converter

ADJ Adjust

ADMA Amplitude Domain Multiple Access

ADPCM Adaptive Differential Pulse Code Modulation

AFC Automatic Frequency Control AGC Automatic Gain Control

AIS Alarm Indication Sig nal

AM Amplitude Modulation AMI Alternate Mark Inversion AOC Automatic Offset Control

APM Amplitude Phase Modulation

ASC Add-Select-Compare

ASCII American Standard Code for Information Interchange

ASK Amplitude Shift Keying

ASYNC Asynchronous

AUPC Automatic Uplink Power Control

AUX 1 Auxiliary 1

AVC Automatic Volume Control

BB Baseband

BCD Binary Coded Decima l

BER Bit Error Rate

BER CONT BIT Error Rate Continuous

bit/s bits per second

BPSK Bi-Phase Shift Keying

Ohms

Definition

Rev. 1 g–1

Glossary SNM-1001 Network Control Modem

BTU British Thermal Unit

BW Backward Alarm or Bandwidth

BWR Bandwidth Ratio

CCelsius

C/N Carrier-to-Noise Ratio

C/No Carrier-to-Noise Density Ratio

CCITT International Telephone and Telegraph Consultative Committee

CDMA Code Division Multiple Access

CH Channel

CHNL Channel

CIC Common Interface Circuit

CL Carrier Loss

CLK Clock

CLNA C-band LN A

CLR Clear

CMOS Complementary Me ta l Oxide Semiconductor

Coax Coaxial

Codec Coder/Decoder

COM Common

CPFSK Continuous-Phase Frequency Shift Keying

CPSK Coherent Phase Shift Keying

CPU Central P r ocessing Unit

cr Carriage Return CRC Cyclic Redunda nc y Check CRT Cathode Ray Tube

CS Clear to Send

CSC Comstream Compatible

CSMA Carrier Sense Multiple Access

CTS Clear to Send

CU Channel Unit CW Continuous Wave D&I Drop and Insert D/A Digital-to-Analog D/C Down Conver te r

DAC Digital-to-Analog Converter

DAMA Demand Assignment Multiple Access

DSP Digital Signal Processing

dB Decibels

dB/Hz Decibels/Hertz (unit of carrier -to- noise de ns ity ratio)

dBc Decibels referred to carrier

dBm Decibels referred to 1.0 milliw att

dBm0 The signal ma g nitude in dBm referenced to the nominal level at that point

dBW Decibels referred to 1.0 watt

DC Direct Current

DCE Data Circuit Terminating Equipment

DCPSK Differentially Cohere nt Phase Shif t Ke ying

DDO Drop Data Output DDS Direct Digital Synthesis

Demod Demodulator

DEMUX Demultiplexer

DET Detector

DM Data Mode

DPCM Dif f e r entia l Pulse C ode Modula tion

DPSK Diff e rentia l Phase Shif t Ke ying

DSP Digital Signal Processing DSR Data Signal Rate

g–2 Rev. 1

SNM-1001 Network Control Modem Glossary

DTE Data Terminal Equipment E&M Ear and Mouth Eb/N

Bit Energy-to-Noise Ratio

ECL Emitter Coupled Logic

EDP Electronic Data Processing

EEPROM Electrically-Erasable Programmable Read-Only Memory

EFD Adaptive Broadband Compatible

EIA Electronic Industries Association

EMC Electro-Magnetic Compatibility

EMF Electromotive Force

EPROM Erasable Read-Only Memory

ESC Engineering Service Circuit or Engineering Service Channel ESD Electrostatic Discharge EXC External Clock EXT External Reference Clock FDC Fairchild Data Compatible

FDMA Frequency Division Multiple Access

FEC Forward Error Correction

FET Field Effect Transistor

FFSK Fast Frequency Shift Keying

FIFO First in/First Out

Flt Fault

FM Frequency Modulation

FPGA Field Programmable Gate Array

FS Frame Sync

FSK Frequency Shift K e ying

FW Firmware

GHz

Gigahertz (10

hertz)

GND Ground

HI STAB High Stability

HPA High Power Amplifier

Hz Hertz (cycle per second)

I&Q In-Phase and Quadrat ure

I/O Input/Output

IBS INTELSAT Business Services

IC Integrated Circuit

IDI Insert Data Input

IDR Intermediate Data Rate

IESS INTELSAT Earth Station Standards

IF Intermediate Frequency

INMARSAT International Maritime Satellite Organization

INTELSAT International Telec om munications Satellite Organiza tion

ISD Insert Send Data

Ω

kbit/s

kHz

kilo (10

) kilo-ohms Kilobits per second (10

Kilohertz (10

Hertz)

bits per second)

ks/s Kilosymbols Per Second (103 symbols per second)

Kilowatt (10

Watts) LAN Local Area Network LCD Liquid Crystal Display LED Light-Emitting Diode

lf Line Feed

LNA Low Noise Amplifier

LO Local Oscillator

Rev. 1 g–3

Glossary SNM-1001 Network Control Modem

LSB Least Significant Bit

LSI Large Scale Integration (semiconductors)

mille (10

-3

)

M&C Monitor and Control

mA Milliamperes

Max Maximum

MAN Metropolitan Area Network

Mbit/s Megabits per second

MC Monitor and Control

MFS Multiframe Sync

MHz

Megahertz (10

Hertz)

MIDAS Multimedia Integrated Digital Access System

Min Minimum or Minute

MNA Midas Net wor k Access

Mod Modulator

MOP Modulated Output Power

MPC Microprocessor Controller

Millisecond (10

-3

second)

Ms/s Megasymbols per s e c ond

MSB Most Significant Bit

MUX Multiplexer

nano (10

-9

)

N/A Not Applicable

NACK Negative A c k nowledgment

NC No Connection or Normally Closed NO Normally Open

NRZ Non-Return to Zero (code)

Nanosecond (10

-9

second)

OQPSK Offset Quadrature Phase Shift Keying

OSC Oscillator

pico (10

-12

)

P-P Peak-to-Peak

P/AR Peak to Average Ratio

PAL Programmable Array Logic

PC Printed C ircuit

PCB Printed Circuit Board

PCM Pulse Code Modulation

PECL Positive Emitter Coupled Logic

PicoFarads (10

-12

Farads)

PK Peak

PLL Phase-Locked L oop

PN Pseudo-Noise

PPM Parts Per Million

PS Power Supply

PSK Phase Shift Keying PWB Printed Wiring Board PWR Power

QAM Quadrature Amplitude Modula tion

QPSK Quadrature Phase Shift Keying

RAM Random Access Memory

RD Receive Data

REF Reference

RF Radio Frequency

RLSD Recei ve Line Signal Detect

RMA Return Material Authorization

g–4 Rev. 1

SNM-1001 Network Control Modem Glossary

ROM Read-Only Memory

RR Receiver Ready RS Ready to Send RT Receive Timing

RTS Request to Send

RX Receive (Receiver)

RXCLK Receive Clock

RXD Receive Data

RZ Return-to-Zero

s Second

S/N Signal-to-Noise Ratio

SCPC Single Channel Per Carrier

SCR Serial Clock Receive

SCT Serial Clock Transmit

SCTE Serial Clock Transmit External

SD Send Data

SFS Subframe Sync

SMS Satellite Multiservice System

SN Signal-to-Noise Ratio

SSB Single-sideband

SSPA Solid State Power Amplifier

ST Send Timing

SW Switch

SYMBCK Symbol Clock

SYN Synthesizer

SYNC Synchronize

TB Terminal Block

TCXO Temperature-Compensate d Crystal Oscillator

TDMA Time Division Multiple Access

TEMP Temperature TERR Terrestrial

TP Test Point TT Terminal Timing

TTL Transistor-Transistor Logic

TX Transmit (Transmitter)

TXCLK Transmit Clock

TXD Transmit Data TXO TX Octet

U/C Up converter

UART Universal Asynchronous Receiver/Transm itter

UHF Ultra-high Frequency

UNK Unknown

US United States

UW Unique Word

V Volts VAC Volts, Alternating Current VCO Voltage-Controlled Oscillator

VCXO Voltage-Controlled Crystal Oscillator

VDC Volts, Direct Current

VSWR Voltage Standing Wave Ra tio

WWatt

WG Waveguide

The following list contains definitions of terms that may be found in this manual.

Rev. 1 g–5

Comtech EF Data SNM-1001 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Customer Support

Table of Contents

About this Manual

Conventions and References

Reporting Comments or Suggestions Concerning this Manual

European EMC Directive

Warranty Policy

Limitations of Warranty

Exclusive Remedies

Disclaimer

1.2 Mode of Operation

• Unpacking

2.3 External Modem Connectors

2.3.1 DATA I/O Interface (J8)

2.3.4 TX IF Output (CP1)

2.3.5 RX IF Input (CP2)

2.3.9 AGC Test Point

3.1.2 Front Panel Keypad Option

• Modulator

SNM-1001 Network Control Modem Theory of Operation

Theory of Operation SNM-1001 Network Control Modem

4.2.3 Viterbi Decoding Theory

4.3 Monitor and Control

4.3.2 Remote Interface Specification

4.3.3 M&C Theory of Operation

4.3.4 Remote Interface Configuration

• System checkout

5.2.3 Transmit Interface Faults

5.2.4 Receive Interface Faults

5.2.5 Common Equipment Faults

5.5 Repackaging Requirements for Shipment

• Start Character

• Device Address

Glossary