The following changes provide updated information for page xii and Section 3.2.9. This
information will be incorporated into the next revision.
Change Specifics:
Changes to power consumption and fusing information
May 30, 2003
SNM-1001L Satellite Modem Installation and Operation Manual,
Rev. 1, dated March 17, 2003
MN/SNM1001L.EA1
Attach this page to page xii
ELECTRICAL SAFETY
The SNM-1001L Satellite Modem has been shown to comply with the following safety standard:
• EN 60950: Safety of Information Technology Equipment, including electrical business
machines.
The equipment is rated for operation over the range 85 to 264 volts AC. It has a maximum
power consumption of 55 watts without BUC power supply. Input power increases to 175W
with 100W, 24V BUC power supply at maximum load. Input power increases to 230W with
150W, 48V BUC power supply at maximum load.
FUSES
The SNM-1001L Satellite Modem is fitted with two fuses, one each for line and neutral
connections. These are contained within the body of the IEC power connector, behind a small
plastic flap.
• Use T3.15A, 20mm fuses.
For continued operator safety, always replace the fuses with the
reserved. Printed in the USA.
Comtech EF Data, 2114 West 7th Street, Tempe,
Arizona 85281 USA, 480.333.2200 FAX: 480.333.2161
Revision 1
March 17, 2003
Customer Support
Contact the Comtech EF Data 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 EF Data
Attention: Customer Support Department
2114 West 7th Street
Tempe, Arizona 85281 USA
480.333.2200 (Main Comtech EF Data 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
Contact us via the web at www.comtechefdata.com
To return a Comtech EF Data product (in-warranty and out-of-warranty) for repair or
replacement:
1. Request a Return Material Authorization (RMA) number from the Comtech EF
Data Customer Support Department.
Be prepared to supply the Customer Support representative with the model
number, serial number, and a description of the problem.
2. To ensure that the product is not damaged during shipping, pack the product in
its original shipping carton/packaging.
3. Ship the product back to Comtech EF Data. (Shipping charges should be
prepaid.)
For more information regarding the warranty policies, see p.xviii.
.
i
Table of Contents
Customer Support........................................................................................................................................ i
About this Manual ...................................................................................................................................xiii
APPENDIX B. REMOTE CONTROL OPERATION.............................................................. B–1
B.1 General ............................................................................................................................................. B–1
FIGURE 4-3. MENU TREE.....................................................................................................................................4–6
FIGURE 4-5. IF LOOPBACK ...............................................................................................................................4–22
TABLE 3-7. AUX 1 CONNECTOR AND PINOUTS (J9).....................................................................................3–9
TABLE 3-8. ALARMS CONNECTOR AND PINOUTS (J10).............................................................................3–10
TABLE 4-1. LED INDICATORS ............................................................................................................................4–2
This manual provides installation and operation information for the Comtech EF Data
SNM-1001A satellite modem. This is a technical document intended for earth station
engineers, technicians, and operators responsible for the operation and maintenance of
the SNM-1001A.
Related Documents
The following documents are referenced in this manual:
• INTELSAT Earth Station Standards 308, 309, and 310
Conventions and References
Cautions and Warnings
CAUTION
WARN ING
IMPORTANT
CAUTION indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury. CAUTION may also be used to indicate other
unsafe practices or risks of property damage.
WARNING indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
IMPORTANT indicates a statement that is associated with the task
being performed. .
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.
Recommended Standard Designations
Recommended Standard (RS) Designations have been superseded by the new designation
of the Electronic Industries Association (EIA). References to the old designations are
shown only when depicting actual text displayed on the screen of the unit (RS-232, RS485, etc.). All other references in the manual will be shown with the EIA designations
(EIA-232, EIA-485, etc.) only.
Trademarks
Product names mentioned in this manual may be trademarks or registered trademarks of
their respective companies and are hereby acknowledged.
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 EF Data Customer
Support Department.
The SNM-1001L Satellite Modem has been shown to comply with the following safety standard:
• EN 60950: Safety of Information Technology Equipment, including electrical business
machines.
The equipment is rated for operation over the range 85 to 264 volts AC. It has a maximum
power consumption of 60 watts.
FUSES
The SNM-1001L Satellite Modem is fitted with two fuses, one each for line and neutral
connections. These are contained within the body of the IEC power connector, behind a small
plastic flap.
• For 230 volt AC operation, use T0.75A, 20mm fuses.
• For 115 volt AC operation, use T1.25A fuses, 20mm fuses.
IMPORTANT
Environmental
The SNM-1001L shall not be operated in an environment where the unit is exposed to
extremes of temperature outside the ambient range 0 to 50°C (32 to 122°F), precipitation,
condensation, or humid atmospheres above 95% RH, altitudes (un-pressurised) greater
than 2000 metres, excessive dust or vibration, flammable gases, corrosive or explosive
atmospheres.
Operation in vehicles or other transportable installations that are equipped to provide a
stable environment is permitted. If such vehicles do not provide a stable environment,
safety of the equipment to EN60950 may not be guaranteed.
For continued operator safety, always replace the fuses with the
correct type and rating.
The installation and connection to the line supply must be made in compliance to local or
national wiring codes and regulations.
The SNM-1001L is designed for connection to a power system that has separate ground,
line and neutral conductors. The equipment is not designed for connection to power
system that has no direct connection to ground.
The SNM-1001L is shipped with a line inlet cable suitable for use in the country of
operation. If it is necessary to replace this cable, ensure the replacement has an equivalent
specification. Examples of acceptable ratings for the cable include HAR, BASEC and
HOXXX-X. Examples of acceptable connector ratings include VDE, NF-USE, UL, CSA,
OVE, CEBEC, NEMKO, DEMKO, BS1636A, BSI, SETI, IMQ, KEMA-KEUR and
SEV.
International Symbols:
Symbol Definition Symbol Definition
~
Alternating Current
Fuse
Telecommunications Terminal Equipment Directive
In accordance with the Telecommunications Terminal Equipment Directive 91/263/EEC,
this equipment should not be directly connected to the Public Telecommunications
Network.
In accordance with European Directive 89/336/EEC, the SDM-300L3 Satellite Modem
has been shown, by independent testing, to comply with the following standards:
Emissions: EN 55022 Class B - Limits and methods of measurement of radio
interference characteristics of Information Technology Equipment.
(Also tested to FCC Part 15 Class B)
Immunity: EN 50082 Part 1 - Generic immunity standard, Part 1: Domestic,
commercial and light industrial environment.
Additionally, the SDM-300L3 has been shown to comply with the following standards:
EN 61000-3-2 Harmonic Currents Emission
EN 61000-3-3 Voltage Fluctuations and Flicker
EN 61000-4-2 ESD Immunity
EN 61000-4-4 EFT Burst Immunity
EN 61000-4-5 Surge Immunity
EN 61000-4-6 RF Conducted Immunity
EN 61000-4-8 Power frequency Magnetic Field Immunity
EN 61000-4-9 Pulse Magnetic Field Immunity
EN 61000-4-11 Voltage Dips, Interruptions, and Variations Immunity
EN 61000-4-13 Immunity to Harmonics
In order that the Modem continues to comply with these standards,
observe the following instructions:
IMPORTANT
• Connections to the transmit and receive IF ports (Type N and Type F, female,
connectors) should be made using a good quality coaxial cable - for example
RG58/U (50Ω or RG59/U (75Ω).
• All 'D' type connectors attached to the rear panel must have back-shells that
provide continuous metallic shielding. Cable with a continuous outer shield
(either foil or braid, or both) must be used, and the shield must be bonded to the
back-shell.
• The equipment must be operated with its cover on at all times. If it becomes
necessary to remove the cover, the user should ensure that the cover is correctly
re-fitted before normal operation commences.
This Comtech EF Data product is warranted against defects in material and workmanship
for a period of two years from the date of shipment. During the warranty period, Comtech
EF Data 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 EF
Data and all related custom, taxes, tariffs, insurance, etc. Comtech EF Data is responsible
for the freight charges only for return of the equipment from the factory to the customer.
Comtech EF Data will return the equipment by the same method (i.e., Air, Express,
Surface) as the equipment was sent to Comtech EF Data.
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 repackaging of
equipment for return to Comtech EF Data.
No other warranty is expressed or implied. Comtech EF Data 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 EF
Data 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 EF Data 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 EF Data 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 EF Data Customer Support Department.
xviii
Chapter 1. INTRODUCTION
SNM-1001L
Satellite
Modem
The SNM-1001L Satellite Modem is a dual function modem: it can operate in burst and
continuous mode.
Comtech EF Data FAST system allows immediate implementation of different options
through the user interface keypad. Some FAST options are available through the basic
platform unit, while others require that the unit be equipped with optional hardware or
that the hardware be installed in the field. Refer to Table 1-1 for a listing of possible
configurations.
The options available through the FAST architecture include:
• Single Data Rate • BUC FSK: DiSEQ
• Low Variable Data Rate
(up to 512 kbps)
• High Variable Data Rate
(up to 4.375 Mbps)
• Sequential Decoder
• Viterbi Decoder
• Asymmetrical Loop Timing
* Optional hardware required.
• OQPSK
• 8-PSK
• Offset QPSK
• Reed-Solomon COdec *
• AUPC
• Turbo Codec
Table 1-1. FAST Options and Required Configurations
Hardware
Basic Platform
SNM-1001L
FAST Option X X X X X X X
FAST Option with
Reed-Solomon
Option with Turbo
Hardware
Single Data rate
Low Variable Data
Rate
High Variable Data
Rate
X X
(Note 1)
X X
X
Sequential Decoder
X
(Note 1)
Viterbi Decoder
X
Asymmetrical Loop
Timing
BUC FSK: DiSEQ
Offset QPSK
8-PSK
Reed-Solomon
Codec (See Note 2)
AUPC
Turbo Codec (See
Note 2)
Notes:
1. The basic modem is shipped with either Sequential or Viterbi decoder.
2. Either Reed-Solomon or Turbo Codec is installed, not both.
The SNM-1001L is functionally compatible with many Comtech EF Data modems.
When properly configured, the unit will interoperate with the following Comtech EF
Data modems:
• CDM-550/550T (Turbo only) • SDM-650B
• CDM-600 (Open Network and Turbo only) • SDM-6000
• SDM-100/100A • SDM-8000
• SDM-300/300A • SDM-150A
• SNM-1010
1.6 Description of the Modulator
1.6.1 Overview
The modulator provides PSK modulated carriers within the 950 to 1750 MHz range. The
types of modulation that encode the transmitted baseband data from the interface PCB
are:
• BPSK
• QPSK
• Offset QPSK
• 8-PSK
1.6.2 Functional Description
The modulator is composed of eight basic subsections. These subsections are divided into
the baseband processing section and the RF section of the modulator. The modulator
controls all programmable functions on this module. Fault information from the
modulator is sent to the M&C. Refer to Chapter 9 for a list of reported faults. The major
modulator subsections are:
If the modem is so equipped, the optional Reed-Solomon PCB first processes the data.
The data is then sent to the scrambler for energy dispersal, and then to the differential
encoder. The differential encoder is a 2-bit encoder, which allows for resolution of two of
the four ambiguity states of the QPSK or OQPSK demodulator.
The data is sent to the convolutional encoder for encoding the baseband data. The code
rates 1/2, 3/4, 7/8, and 2/3 are based on the symbol rate range of 2.4 kbps to 2.5 Mbps.
For Viterbi codes, the convolutional encoder encodes the data at 1/2 rate. If the selected
code rate is 3/4, then 2 of every 6 symbols are punctured. For 3 bits in, there are 4
symbols out.
• For Sequential codes, the convolutional encoder generates the parity bits from the
input data stream, which allows for error correction at the far end of the link. The
rate of the encoder may be 1/2, 3/4, and 7/8.
For example, the 7/8 rate puts out 8 symbols for every 7 bits in. In {O}QPSK
mode, the data is split into two separate data streams to drive the I and Q channels
of the modulator.
The baseband processing for the SNM-1001L does not use the digital modulation.
Instead, the baseband Nyquist filtered I and Q signals pass through D/A converters to
drive an analog vector modulator.
The local oscillator input to the vector modulator is a single loop synthesizer
incorporating a Direct Digital Synthesis (DDS) chip to accommodate 100 Hz steps over
the range of 950 to 1750 MHz. The modulator output then passes through amplifiers and
AGC incorporating programmable output level control and switched low pass filters for
harmonic attenuation.
1.6.3 Description of Modulation Types
The modulation types for the modem include BPSK, QPSK, Offset QPSK, or 8-PSK.
The PSK data transmission encoding method uses the phase modulation technique. This
method varies the phase angle of the carrier wave to represent a different bit value for the
receiver. The higher levels of modulation are required for an operating range that has a
limited bandwidth.
The order of modulation is represented by mPSK, where “m” relates to the number of
discrete phase angles. Refer to the following list for a brief description of the modulation
types.
• BPSK: 2 discrete phase angles represent the 2 possible states of a symbol.
• Offset QPSK: 4 discrete phase angles represent the 4 possible states of a symbol.
• 8-PSK: 8 discrete phase angles represent the 8 possible states of a symbol.
Note: The code rate determines the number of symbols per bit.
1.6.3.1 BPSK Encoding
The modulator converts transmitted baseband data into a modulated BPSK carrier at
2.4 kbps to 1.25 Mbps (1/2 rate). Using vector analysis of the constellation pattern, BPSK
represents one symbol with the carrier phase either at 0° or 180°. The 1/2 rate encoding at
the convolutional encoder provides two symbols output for every bit input.
Uncoded (1/1 rate) BPSK operation also is allowed from 4.8 kbps to 2.5 Mbps.
Code Rate Symbols/Bit Bits/Hz
1/2 2 0.5
1/1 1 1
1.6.3.2 QPSK Encoding
The modulator converts transmitted baseband data into a modulated QPSK carrier at the
following parameters:
• 4.6 kbps to 5.0 Mbps (1/1 rate, uncoded)
• 4.8 kbps to 2.5 Mbps (1/2 rate)
• 7.2 kbps to 3.75 Mbps (3/4 rate)
• 8.4 kbps to 4.375 Mbps (7/8 rate)
Using vector analysis of the constellation pattern, QPSK represents a symbol with the
carrier phase angle at 45°, 135°, 225°, or 315°. The 1/1, 1/2, 3/4, and 7/8 rates encoded at
the convolutional encoder provide the desired input/output bit rates.
The modulator PCB converts the transmitted baseband data into a modulated Offset
QPSK carrier within the same parameters as QPSK.
The Offset QPSK modulation is mainly different from QPSK by offsetting the I and Q
channel modulation signals. This offset prevents the RF envelope from going through
zero. Under certain conditions, this may allow less back-off in the High Power Amplifier
(HPA) system. The 1/1, 1/2, 3/4, and 7/8 rates encoded at the convolutional encoder
provide the desired input/output bit rates.
Code Rate Symbols/Bit Bits/Hz
1/1 1 2
1/2 2 1
3/4 1.333 1.5
7/8 1.143 1.75
1.6.3.4 8-PSK Encoding
The modulator converts transmitted baseband data into modulated 8-PSK carrier at the
following parameters:
• 64 kbps to 5.000 Mbps (2/3 rate)
Using vector analysis of the constellation pattern, 8PSK represents a symbol with carrier
phase angles at 22.5°, 67.5°, 112.5°, 157.5°, 202.5°, 247.5°, 292.5°, and 337.5°. The 2/3
rate encoding provides the desired input/output bit rates.
Code Rate Symbol/Bit Bit/s Hz
2/3 1.5 2
1–8
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Introduction MN/SNM1001L.IOM
1.7 Description of the Demodulator
A block diagram of the demodulator is shown in Figure 1-2.
1.7.1 Overview
The demodulator converts PSK modulated carriers within the 950 to 1750 MHz range to
a demodulated baseband data stream. The converted modulation types are BPSK, QPSK,
Offset QPSK, and 8-PSK. The demodulator then performs FEC decoding on the data
stream to produce the error corrected data output to the data interface.
The demodulator functions as an advanced, digital, coherent-phase-lock receiver and
decoder. Demodulator faults also are reported to the front panel. The demodulator
consists of the following basic subsections.
• Digital Costas Loop
• RF Section
• Automatic Gain Control
• Analog-to-Digital (A/D) Converter
• Soft Decision Mapping
• Programmable Vector Rotation
• Digital Nyquist Filters
• FEC Decoder
• Digital Clock Recovery Loop
• Decoder
The modulated IF signal at 950 to 1750 MHz enters the RF module for conversion to an
IF frequency. The IF is then sampled by an A to D converter and digitally demodulated.
The I and Q data is then sent to the digital Nyquist filters, resulting in a filtered, digital
representation of the received signal. The digital data is then sent to four separate circuits:
• Automatic Gain Control
• Carrier Recovery (Costas) Loop
• Clock Recovery Loop
• Soft Decision Mapping
The AGC provides a gain feedback signal to the RF section. This closed loop control
ensures that the digital representation of the I and Q channels is optimized for the Costas
and Clock loops, as well as the soft-decision mapping circuitry.
When the active decoder determines that the modem is locked, the M&C stops the sweep
and begins the de-stress process. This involves fine tuning the DDS based on the phase
error in the Costas loop. The de-stress process continues as long as the modem is locked.
If the carrier is interrupted, the M&C resumes the sweep process.
The digital Costas loop, in conjunction with a Direct Digital Synthesizer (DDS), performs
the carrier recovery function. The Costas loop consists of a Costas phase detector, loop
filter, and DDS, all implemented digitally. The DDS performs the function of a
Voltage-Controlled Oscillator (VCO) in an analog implementation, but can be easily
programmed to the desired center frequency via the M&C. The output of the DDS is sent
to the RF module and provides the reference to which the local oscillator is locked. The
M&C sweeps the local oscillator (via DDS programming) through the user-specified
sweep range.
The digital clock loop, in conjunction with another DDS, performs the clock recovery
function. The clock loop consists of a phase detector, loop filter, and DDS, all
implemented digitally. The DDS performs the function of a VCO in an analog
implementation. The recovered data and symbol clocks are then used throughout the
demodulator.
The soft decision mapper converts the digital I and Q data to 3-bit soft decision values.
These values are then fed to the programmable vector rotation circuit, providing
compatibility with spectrum reversal of the I and Q channels.
The output of the vector rotation circuit is then sent to the Viterbi decoder and optional
Sequential decoder. The output is then sent to the optional Reed-Solomon or Overhead
PCB. With the Turbo coding hardware option, the vector rotation circuit output is sent to
the optional Turbo Codec for decoding.
1.8 Description of Monitor & Control
1.8.1 Overview
The Monitor & Control (M&C) monitors the modem and provides configuration updates
to other modems within the modem when necessary. The modem configuration
parameters are maintained in battery-backed RAM, which provides total recovery after
power-down situation. The M&C functions include extensive fault and status reporting.
All modem functions are accessible through a local front panel interface and a remote
communications interface.
A block diagram of the M&C is shown in Figure 1-3.
The heart of the M&C card is the Dallas 80C310 microcontroller operating at 11 MHz.
This microcontroller contains 256 Kbytes of internal RAM. The ROM at U8 is 29F040
(512 kbytes).
ROM access times must be equal to or greater than 150 ns. The RAM size can be 8 or
32 Kbytes. This RAM chip is internally battery-backed and contains a real time clock
used by the M&C.
The non-volatile RAM on the M&C module allows the module to retain configuration
information without prime power for 1 year (approximately). If the modem is powered
down, the following sequence is carried out by the M&C microcontroller.
1. When power is applied to the M&C, the microcontroller checks the non-volatile
memory to see if valid data has been retained. If valid data has been retained, the
modem is reconfigured to the parameters maintained by the RAM.
2. If the non-volatile memory fails the valid data test, a default configuration from
ROM is loaded into the system.
The UART supports serial ASYNC communications channels (remote port) with a
maximum data rate of 19200 bit/s. The UART is a built-in peripheral of the
microcontroller. The communications type can be EIA-232, EIA-485 (2-wire),
EIA-485 (4-wire), and software selectable.
The DAC supplies a voltage that controls the contrast of the display. The ADC monitors
all the voltages from the power supply. The DAC and ADC are mapped to the
microcontroller with an Integrated Circuit (IC) bus.
The user interface includes the following parts:
• Front panel
• Status LEDs
• Keyboard
• Sounder (beeper)
All functions are memory-mapped to the microcontroller.
1–13
SNM-1001L Satellite Modem Revision 1
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Introduction MN/SNM1001L.IOM
1.9 Dimensional Envelope
Refer to Figure 1-2 for the unit’s dimensional envelope drawing.
Note: Dimensions are listed in inches and centimeters are in parentheses.
The modem arrives fully assembled from the factory. After unpacking the modem, install the
modem as follows:
2.2.1 Modem Installation (Optional)
Refer to Figure 2-1. Use the following mounting kit, KT/6228-1.
Optional: Mounting KIT, KT/6228-1 (Modem to Equipment Rack)
QTY Part Number Description
2 FP/6138-1 Bracket, Rear Support
4 HW/10-32x1/2RK Bolt, #10 Rack
2 HW/10-32X1/4 SHC Screw, Socket 10-32 x 1/4inch
Tools Required:
Screw Driver Phillips
5/32-inch SAE Allen Wrench
1. Install the IDU rear support brackets as follows:
a. Install provided rear support bracket onto the mounting rail of the rack. Fasten
with provided bracket bolts.
b. Fasten the provided #10 socket head screws to the rear-side mounting holes on
either side of the chassis modem. Mount the modem into the equipment rack
ensuring that the socket heads engage into the slots of the rear support brackets.
Note: It may be necessary to adjust the location of the rear mounting rails of the rack.
2–2
SNM-1001L Satellite Modem Revision 1
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Installation MN/SNM1001L.OM
Equipment
Rack
Mounting
Rail
BRACKET
*
BOLTS
#10 Socket head
*
* Note: Components of mounting kit KT/6228-1
screw
Support
*
Bracket
ID
Figure 2-1. Installation of the Optional Mounting Bracket KT/6228-1
The TX/RX Reed-Solomon PCBs are installed in the same slots as the Turbo module.
Do not mix Reed-Solomon PCBs with Turbo PCB. Damage to the equipment
may be the result.
CAUTION
2.3.1.1 Unpacking
This equipment contains parts and assemblies sensitive to damage by ESD.
Use ESD precautionary procedures when touching, removing, or inserting
CAUTION
PCBs.
1. Remove the Reed-Solomon PCB and mounting hardware from the cardboard
caddypack and anti-static material.
2. Check the packing list to ensure the shipment is complete.
3. Inspect the Reed-Solomon PCB for any shipping damage.
2.3.1.2 Installation
The following tool is required to install the overhead interface PCB:
Description Application
Phillips Screwdriver
Use the following information to install the Reed-Solomon Codec PCB as a daughter
card on the main PCB.
Refer Figure 2-3 for installation location of the Reed-Solomon daughter card.
Turn the power off before installation. High current VDC is present. Failure
to do so could result in damage to modem components.
CAUTION
1. Turn off the modem and unplug the power supply.
2. Remove the rear panel retaining screws. Using the finger pulls, slide the main modem
assembly out from the rear of the modem chassis.
3. Install the Reed-Solomon PCB to the main PCB by mating the male SIMM connectors
with the female SIMM connectors in the position shown in Figure 2-2.
4. After completing the above installation procedure turn on the modem. If the
Reed-Solomon PCB was installed properly, the Utility Interface/Interface Module menu
will display “OPT:Reed-Solomon.”
The Turbo Card is installed in the same slots as the Reed-Solomon PCBs. While the ReedSolomon uses two cards (TX and RX), the Turbo Codec uses only a single card.
DO not mix Reed-Solomon PCBs with Turbo PCs. Damage to the equipment
may be the result.
CAUTION
2.3.2.1 Unpacking
This equipment contains parts and assemblies sensitive to damage by ESD.
Use ESD precautionary procedures when touching, removing, or inserting
CAUTION
PCBs.
1. Remove the Turbo Codec PCB and mounting hardware from the cardboard caddypack
and anti-static material. Check the packing list to ensure the shipment is complete.
2. Inspect the Turbo PCBs for any shipping damage.
2.3.2.2 Installation
The following tool is required to install the overhead interface PCB:
Description Application
Phillips Screwdriver
Use the following information to install the Turbo Codec PCB as a daughter card on the main
PCB.
Refer Figure 2-3 for installation location of the Turbo Codec PCB.
Turn the power off before installation. High current VDC is present. Failure
to do so could result in damage to modem components.
CAUTION
1. Turn off the modem and unplug the power supply.Remove the rear panel retaining
screws. Using the finger pulls, slide the main modem assembly out from the rear of the
modem chassis.
2. If required: Reed-Solomon Removal – Remove the Reed-Solomon boards from the
SIMM sockets by pushing the spring clips outward while rocking the board vertically,
then lift the board out.
3. Turbo Codec Installation - Align the Turbo board with either of the SIMM sockets
while holding it vertically with components toward Rear panel. Seat the connector into
the socket and tilt the board toward the Front Panel until the spring clips lock the board
into place.
4. Replace the top cover and reinstall the two side screws.
2.4 Data I/O Interface Connector (J8) Removal/Installation
Note: The following procedures outline the removal and installation of the Data I/O connector
(J8). These procedures are written with the assumption that the same configured connector will
be reinstalled. However, the operator does have an option to install a different configured
connector. Refer to Table 2-1 for a matrix explaining connector options.
Table 2-1. Connector (J8) Matrix
Modem Configuration EIA-422/EIA449 V.35
25-pin Connector X X
34-pin Connector X
37-pin Connector X
To remove Data I/O Connector (J8), as follows:
1. (For Ribbon-Configured Connector PL/6031.) Remove Data I/O connector (J8)
(Figure 2-4) as follows:
a. Remove four screws securing the rear panel to the chassis.
b. Pull out rear panel to gain access to disconnect connector (J8).
c. Disconnect connector (J8) from the PCB.
d. Remove the four screws securing connector (J8) to the rear panel.
Figure 2-4. Data I/O Connector (J8) Removal/Installation
2.5 Hardware Upgrades
2.5.1 Main PCB Firmware Chips
The main PCB has one field-changeable flash memory chip for the M&C firmware. If
necessary, this chip can be removed and a new chip added to allow for additional options,
enhancements, or repairs. See Figure 2-5 for the locations of the field-changeable chips.
The bulk firmware for the FPGA downloads is stored in a non-replaceable flash memory device.
Bulk firmware can be upgraded by reflashing the device through the remote control port as
described in paragraph 2.6. The M&C firmware also can be upgraded by reflashing through the
host port.
The SNM-1001L eliminates the need for physically replacing EPROMs to update firmware.
Instead, the SNM-1001L modem uses ‘flash memory’ technology internally, and new firmware
can be uploaded to the unit from an external PC.
Performing a flash upgrade erases the non-volatile RAM, which is
where the modem's configuration is stored. Users shall re-enter the
IMPORTANT
The SNM-1001L provides for flash upgrading the M&C firmware or the BULK firmware.
Note: While the M&C and BULK firmware downloads are independent processes, the modem
may have to be upgraded to the latest releases of both the M&C and BULK for proper function.
Flash updating firmware is a simple process, and users can obtain updates by any of the
following means:
The upgrade is performed without opening the unit, by connecting the modem to the serial port
of a computer and executing a flash uploader utility program.
The cable to connect the PC to the modem is the same as is used for normal EIA-232 remote
control, and comprises three wires connected between two 9-pin ‘D’ type female connectors.
Ensure this cable is connected and working properly before proceeding with a flash update.
WARN ING
desired configuration parameters.
• Download from the Comtech EF Data website: (http://www.comtechefdata.com
• Request as E-mail attachments
• Request shipment on diskettes or cd-rom.
The Remote Control port EIA-232 lines used for Flash upgrading also are
connected to the Primary 25-pin data connector (P3B), and are used when
1:N Redundancy Switch is connected. Ensure that NOTHING is connected
to P3B pins 4, 21 and 22 – if these pins are used, the EIA-232 remote
control port will not function, and Flash upgrading is impossible.
The latest firmware releases and a free software utility are available on the Comtech EF Data
web site (http://www.comtechefdata.com
or Windows NT/2000/XP and provides all of the support required to perform a Comtech EF
Data firmware reflash. If web downloading is not available or practical, contact the Customer
Support department to obtain the firmware via an alternate method.
The downloadable firmware files are provided in both .zip or self extracting .exe formats. If
your firewall does not permit downloading an .exe file, try the .zip file instead. The
downloadable file contents are identical, usually comprising an uploader program, a help file,
and a flashable data file.
). This utility is designed to run under Windows 95/98
2.6.1.1 How to Download Flash Upgrade Files
1 Create a new folder on the PC. This folder will be the destination folder for any flash
upgrade files downloaded.
2
On the Comtech EF Data web site (http://www.comtechefdata.com/
link.
3
Click the “flash upgrades” link for detailed downloading instructions.
4
Click the “flash firmware data files” link (located at the bottom of the instruction page).
The flash firmware data files are organized by product.
5
Click the "SNM-1001L3" link.
6 Identify and download the latest M&C firmware file to the destination folder on the PC.
7 Repeat Step 6 for the BULK firmware file.
), click the “downloads”
2.6.1.2 How to Perform a Flash Upgrade
Full on-line help is provided with the uploader program. If you experience a problem, or have a
question, contact Comtech EF Data Customer Support for assistance.
1 On the PC, double-click the .exe or .zip flash upgrade file to uncompress its contents.
2 Identify and execute the uploader program.
3 Follow the instructions presented on the screen to select a firmware file and initiate the
upload.
Following a successful upload process, the modem will automatically restart, running the new
version of firmware.
2–12
Chapter 3. CONNECTOR PINOUTS
3.1 Connector Overview
The rear panel connectors provide all necessary external connections between the modem
and other equipment. Table 3-1 lists these connectors and Figure 3-1 show their locations.
Data Input/Output (standard modem)
V.35
EIA-449
Data Input/Output
Satellite Clock
Demod I/Q
Automatic Gain Control (AGC) Out
Relay Contacts
Note: The European EMC Directive (EN55022, EN50082-1) requires using properly shielded
cables for DATA I/O. These cables must be double-shielded from end-to-end, ensuring a
continuous ground shield.
The remote connector is a 9-pin subminiature female D connector (J6) located on the rear
panel of the modem. Screw locks are provided for mechanical security of the mating
connector.
The remote connector interfaces the M&C functions to a remote location. The remote
location can be an M&C computer located away from the modem, but attached via cable to
the remote connector. This DCE interface is user selectable for either EIA-232 or EIA-484.
The fault connector provides Form C contact closures for fault reporting. The three Form C
summary fault contacts, ratings 1A maximum at 24 VDC, 0.5A at 120 VAC, are
Modulator, Demodulator, and Common Equipment.
The fault interface connection is a 9-pin subminiature female D connector (J7) located on
the rear panel of the modem. Screw locks are provided for mechanical security on the
mating connector. Refer to Table 3-3 for pinout information.
Table 3-3. Fault Connector and Pinouts (J7)
Pin # Signal Function Name
1 Common equipment is not faulted NO
2 COM
3 Common equipment is faulted NC
4 Modulator is not faulted NO
5 COM
6 Modulator is faulted NC
7 Demodulator is not faulted NO
8 COM
9 Demodulator is faulted NC
Note: A connection between the common (COM) and normally open (NO)
contacts indicates no fault.
The Data I/O interface connector conducts data input and output signals to and from the
modem, and connects to the customer’s terrestrial equipment, breakout panel, or protection
switch. The modem is currently available with a choice of four Data I/O connectors, as
follows:
• 25-pin D connector is the standard connector shipped with a base platform
modem.
• 37-pin D is an alternate connector available upon special request for the base
platform modem.
• 34-pin Winchester is an alternate connector available upon special request for the
base platform modem.
• Eurocom Interface – (Future)
The Data I/O pinout is different for each of the interface configurations. For pinout
information, refer to the appropriate table as follows:
Standard: 25-pin D connector
Optional: 34-pin Winchester connector
Optional: 37-pin D connector
Optional: 50-pin D connector
*Note: Use the MASTER clock for EXTERNAL clock input. This clock input
should equal the data rate unless the Asymmetrical Loop Timing Option (ASLT)
is available. The ASLT option allows selection of different clock rates that vary
from the digital data rate. Refer to the Utility/Modem Type/Modem Options menu
for the ASLT option information.
A SIGGND
B SHLD
C Request to Send (RTS)
D Clear to Send (CTS)
E Data Set Ready (DSR)
F Receive Line Signal Detect (RLSD)
P Send Data A (SD-A)
R Receive Data A (RD-A)
S Send Data B (SD+B)
T Receive Data B (RD+B)
U Serial Clock Transmit External A (SCTE-A)
V Serial Clock Receive A (SCR-A)
W Serial Clock Transmit External B (SCTE+B)
X Serial Clock Receive B (SCR+B)
Y Serial Clock Transmit A (SCT-A)
c (CC) MC-A
d (DD) MC-B
m (MM) Modulator Fault (MF)
n (NN) Demodulator Fault (DF)
a(AA) Serial Clock Transmit B (SCT+B)
Note: Pins H, J, K, L, M, N, Z, a (AA), b (BB), e (EE), f (FF), h (HH), j (JJ),
k (KK), l (LL) have no connection.
The modem is available with a Winchester V.35 as the data I/O connector (PL/6032).
There is a jumper on the unit that either opens or closes the CC line. The interface is
shipped with jumpers in positions 2 and 3, because:
1. Comtech EF Data has determined that several locations use Fireberd test
equipment and a conflict will occur if CC is connected between the modem and
the Fireberd.
2. Placing the jumper in positions 2 and 3 opens up the CC line, because the
TTC/Fireberd test equipment interfaces use the line for DTE/DCE control.
3. Grounding pin CC at the Fireberd interface will change the Fireberd to a
DCE device.
4. Comtech EF Data uses the CC and DD for the input master clock (same as the
external clock input to the modem). To input an external clock, change the jumper
to positions 1 and 2 (the pin closest to the Winchester connector).
There are jumpers on the PL/6031 EIA-422 interface. Place the jumpers on the center pin
and the pin towards the Master Clock (MC) to allow an external clock input on pins 16
and 34.
If desired, place the jumpers on the TR side to allow an external clock input on pins 12
and 30. Place the jumpers on the TR side for Demand Assigned Multiple Access
(DAMA) applications.
The faults are open collector levels that indicate a modulator or demodulator failure. A logic
“1” indicates the faulted condition.
AGC_OUT is a programmable voltage, 0 to 10V, for a receive signal level between
-25 and -60 dBm.
AUX 1 connection is a 9-pin female D connector (J9) located on the rear panel of the
modem. Screw locks are provided for mechanical security on the mating connector. Refer
to Table 3-7 for pinout information.
The alarm connector provides Form C contact closures for alarm reporting. The two Form C
summary fault contacts are Modulator and Demodulator.
The alarm connection is a 9-pin female D connector (J10) located on the rear panel of the
modem. Screw locks are provided for mechanical security on the mating connector. Refer to
Table 3-8 for pinout information.
Table 3-8. Alarms Connector and Pinouts (J10)
Pin # Signal Function Name
1 Alarm 1 is faulted NO
2 COM
3 Alarm 1 is not faulted NC
4 Alarm 2 is faulted NO
5 COM
6 Alarm 2 is not faulted NC
7 Alarm 3 is faulted NO
8 COM
9 Alarm 3 is not faulted NC
• Alarm 1 = Not used
• Alarm 2 = TX
• Alarm 3 = RX
3.2.6 RF Output Connector (CP1)
CP1 is a 50Ω Type N connector for the TX IF signal. In normal operation, the output will
be a QPSK (Optional: OQPSK or 8PSK) or BPSK modulated result of the Data I/O
connector between 950 to 1750 MHz, in 100 Hz steps
3.2.7 External Reference (CP2)
CP2 is a BNC connector for an EXT REF. The input impedance is 75Ω. For normal
operation, the desired carrier signal level is ≥ 0 dB. EXT REF frequencies are EXT 1,
EXT 5, EXT 10, and EXT 20 MHz.
3.2.8 RF Input Connector (CP3)
CP3 is a 75Ω, Type F Female connector for an RX IF signal.
The modem front panel (Figure 4-1) enables control of modem configuration parameters and
displays the modem status.
TRANSMIT
SNM-1001L
Satelli te Modem
SNM-1010DataControlModem
RECEIVE
Figure 4-1. Front Panel View
TRANSMIT
RECEIVE
COMMON
STORED
POWERON
OPWERON
NSMITTERON
NSMITTERON
TR
TR
RRIERDETECT
RRIER DETECT
C
C
T
EST M ODE
TESTMODE
OPERATION
ENTER
ENTER
R
CLE
R
CLE
The front panel features include:
• 32-character, 2-line LCD display
• 6-button keypad for local control
• 10 LEDs to provide overall status at a glance
All functions are accessible at the front panel by entering one of six pre-defined Function
Select categories or levels:
• Configuration
• Monitor
• Faults/Alarms
• Stored Faults/Alarms
• AUPC
• Utility
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4.1.1 LED Indicators
The 10 LEDs on the front panel indicate:
• General modem summary faults
• Status
• Alarms
The indicators are defined in Table 4-1 as follows:
Table 4-1. LED Indicators
Name LED Meaning
Faults
Transmit Red A fault condition exists in the transmit chain.
Receive Red A fault condition exists in the receive chain.
Common Red A common equipment fault condition exists.
Stored Yellow A fault has been logged and stored.
The fault may or may not be active.
Status
Power On Green Power is applied to the modem.
Transmitter On Green Transmitter is currently on.
This indicator reflects the actual condition of the transmitter, as
opposed to the programmed condition.
Carrier Detect Green Decoder is locked.
Test Mode Yellow Flashes when the modem is in a test configuration.
Alarms
Transmit Yellow A transmit function is in an alarm condition.
Receive Yellow A receive function is in an alarm condition.
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4.1.2 Front Panel Keypad
The front panel keypad permits local operation of the modem. The keypad consists of six keys
(Figure 4-2).
ENTER
CLEAR
Figure 4-2. Keypad
Each key provides one or more logical functions. These functions are defined in the following
table.
ENTER
CLEAR
Left and Right
Diamond Keys
Top and Bottom
Diamond Keys
This key is used to select a displayed function or to execute a modem
configuration change.
This key is used to back out of a selection or to cancel a configuration change,
which has not been executed using [ENTER]. Pressing [CLEAR] generally returns
the display to the previous selection.
These keys are used to move to the next selection or to move the cursor for
certain functions.
Note: Throughout this chapter, [←] and [→] are used to indicate left and right
diamond keys.
These keys are used primarily to change configuration data (numbers). At times,
they are also used to move from one section to another.
Note: Throughout this chapter, [↑] and [↓] are used to indicate top and bottom
diamond keys.
The modem responds by beeping whenever a key is pressed:
• A single beep indicates a valid entry and the appropriate action was taken.
• A double beep indicates an invalid entry or a parameter is not available for operation.
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4.2 Menu System
Note: The menus show features and options that are not available. However, they are shown to
preserve the menu structure and reserve the structure for the future. This does not imply an intent
or obligation to add these features or options in the future.
Use the Main menu in Figure 4-3 as a quick reference for accessing the modem functions. When
the modem power is applied, the base level of the menu system displays the sign-on message:
• • Line 1 of the sign-on message is the modem model number and type.
• • Line 2 is the version number of the firmware.
The main level of the menu system is Function Select. To access this level from the sign-on
message, press the [←] or [→] keys. From the Function Select menu; select one of the functional
categories:
• Configuration
• Monitor
• Faults/Alarms
• Stored Faults/Alarms
• Remote AUPC (ASYNC mode only)
• Utility
Press [←] or [→] to move from one selection to another. When line 2 displays the desired
function, select that level by pressing [ENTER]. After entering the appropriate functional level,
press [←] or [→] to move to the desired function.
To view or change the modem’s configuration, enter the Configuration level from the Function
Select menu. Once in the Configuration menu, press [←] or [→] to scroll through the
Configuration menu selection:
• Modulator
• Demodulator
• Interface
• AUPC
• Save
• Recall
Press [ENTER] to select the desired Configuration menu option. To view the options for the
selected configuration parameters, press [←] or [→]. To change a configuration parameter, press
[ENTER] to begin the change process.
Press [↑] or [↓] to change the parameters. After the display represents the correct parameters,
press [ENTER] to execute the change. This action initiates the necessary programming by the
modem.
To undo a parameter change prior to execution
, press [CLEAR].
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Notes:
1. Figure 4-3 list the front panel menu window selections.
2. Comtech EF Data recommends that selection of the desired Modem Type be made prior
to making any other setting. This procedure is located in the Utility Modem Type menu.
3. Menus or commands that are specific to certain modem configurations are only accessible after
selecting the appropriate modem configuration. This prevents incompatible parameters from
accidentally being selected.
4. All of the windows are accessible in the Custom mode. Take caution not to select incompatible
parameters, as the modem does not shut out incompatible command choices in the Custom mode.
4.2.1 Revision Emulation
To program an emulation mode from Version X.X.X through the current version, use the revision
emulation feature in the Utility: Modem Type menu.
Software Version # Firmware # Rev. Description of Change
2.1.12 FW/8460-1 M Original issue
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MODULATOR
DEMODULATOR
INTERFACE
LOCAL AUPC
SAVE
RECALL
MONITOR (4.3.2)
RAW BER
CORRECTED BER
Eb/No
RECEIVE SIGNAL
SWEEP FREQUEN CY
BUFFER FILL
FRAME ERRORS
LNB CURRENT
LNB VOLTAGE
ODU CURRENT
ODU VOLTAGE
ODU OUTPUT LEVEL
ODU TEMPERATURE
ODU PLL LOCK
ODU SOFTWARE
ODU POWER CLASS
TX L-BAND FREQ
RX L-BAND FREQ
FAULTS/ALARMS (4.3.3)
MODULATOR
DEMODULATOR
TX INTERFACE
RX INTERFACE
COMMON
OUTDOOR UNIT
STORED FLT S/ALMS (4.3.4)
MODULATOR
DEMODULATOR
TX INTERFACE
RX INTERFACE
COMMON
OUTDOOR UNIT
UNAVIL SECONDS
CLEAR
REMOTE AUPC (4.3.5)
CONFIGURATION
MONITOR
UTILIT Y (4.3.6)
MODULATOR
DEMODULATOR
INTERFACE
OUTDOOR UNIT
SYSTEM
MODEM TYPE
SETUP
TX-X CODE/DATA RAT E
TX-IF FREQUENCY
TX TERMINAL FREQ
TX-IF OUTPUT
TX POWER L EVEL
SCRAMBLER
DIFF. ENCODER
CARRIER MODE
MODEM REFERENCE
FSK OUTPUT
ODU POWER SUPPLY
ODU OUTPUT DELAY
ODU 10 MHz REF
RS ENCODER
RX-X CODE/DATA RATE
RX-IF FREQUENCY
RX TERMINAL FREQ
DESCRAMBLER
DIFF. DECODER
RF LOOP BACK
IF LOOP BACK
BER THRESHOLD
SWEEP CENTER
SWEEP RANGE
REACQUISITION
LNB POWER
LNB VOLTAGE
LNB 10 MHz REF
RS DECODER
TX CLOCK SOURCE
TX CLOCK PHASE
EXT-CLK FREQ
BUFFER CLOCK
RX CLOCK PHASE
B-BAND LOOP BACK
INTRFC LOOP BACK
BUFFER SIZE
BUFFER CENTER
LOOP TIMING
TX DATA FAULT
LOCAL AUPC
AUPC ENABLE
NOMINAL POWER
MINIMUM PO WER
MAXIMUM POWER
TARGET EB/NO
TRACKING RATE
LOCAL CL ACTION
REMOTE CL ACTION
ASSIGNED TRANSMIT F ILTERS
TX TERMINAL LO
MOD POWER OFFSET
MODULATOR TYPE
ENCODER TYPE
SCRAMBLER TYPE
TX BPSK ORDERING
MOD SPECTRUM
TX-RS N/K DEEP
TX IESS-310
TX MODE
ODU ALARM - LOW
ODU ALARM - HIGH
RF MODE CONTROL
TX SYMBOL RATE
ASSIGNED RECEIVE FIL TERS
RX TERMINAL LO
DEMODULATOR TYPE
DECODER TYPE
DESCRAMBLER TYPE
RX BPSK ORDERING
RX MODE
MAX PACKET SIZE
DEMOD SPECTRUM
RX-RS N/K DEEP
RX IESS-310 MODE
LNB ALARM - LOW
LNB ALARM - HIGH
RX SYMBOL RATE
TX OVERHEAD TYPE
RX OVERHEAD TYPE
BUFFER PROGRAM
FRAMING STRUCTURE
RTS TX-IF CNT RL
TX DATA PHASE
RX DATA PHASE
CTS DELAY
ODU FSK ADDRESS
ODU OUTPUT POWER
ODU PWR LEVELING
TIME/DATE
REMOTE BAUD RATE
REMOTE ADDRESS
REMOTE TYPE
OPERATION MODE
YEAR DISPLAY
TEST MODE STATUS
LAMP TEST
SELF TEST
DISPLAY CONTRAST
M&C FIRMWARE
BOOT FIRMWARE
FPGA FIRMWARE
TURBO FIRMWARE
DEMO MODE
EXT AGC: MIN/MAX PW R
MASTER RESET
MODEM TYPE
INTELSAT DATA
NRZ DATA I/O
MODEM OPTIONS
CARD #X TYPE
CARD #X OPTIONS
LOCAL MODEM AUPC
MODEM SERIAL #
CARD #X SERIAL
CONFIGURATION CODE - MODEM
CONFIGURATION CODE - CARD #X
Figure 4-3. Menu Tree
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4.3 OPENING SCREEN
This screen is displayed whenever power is first applied to the unit.
SNM-1001L CUSTOM
VER: X.X.X
Press [→] key to go to the any of the following FUNCTIONAL SELECT menu screens
• CONFIGURATION
• MONITOR
• FAULTS/ALARMS
• STORED FLTS/ALMS
• UTILITY
Note: At any time, pressing CLEAR will return to a main heading.
4.3.1 FUNCTION SELECT: CONFIGURATION
FUNCTIONAL SELECT
CONFIGURATION
Press [→] key to go to any of the following sub-menus. Press <ENTER> to review or edit the
menu.
CONFIGURATION MODULATOR
CONFIGURATION DEMODULATOR
CONFIGURATION INTERFACE
CONFIGURATION LOCAL AUPC
CONFIGURATION SAVE
CONFIGURATION RECALL
Permits the user to configure the modulator portion of
the modem.
Permits the user to configure the demodulator portion of
the modem.
Permits the user to configure the interface portion of the
modem.
Permits the user to configure the AUPC parameters of
the modem.
Permits the user to save the configuration of the modem
to non-volatile memory.
Permits the user to configure the modem with a
previously saved configuration.
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4.3.1.1 FUNCTION SELECT: CONFIGURATION: MODULATOR
CONFIGURATION
MODULATOR
Press <ENTER > to review or edit the following sub-menus.
FUNCTION SELECT: CONFIGURATION: MODULATOR:
TX-X CODE/DATA RATE
TX-A QPSK 1/2
64.000 Kbps
TX-B QPSK 1/2
128.000 Kbps
TX-C QPSK 1/2
256.000 Kbps
TX-D QPSK 1/2
512.000 Kbps
TX-V QPSK 1/2
38.400 Kbps
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Upon entry, the current transmitter rate is displayed with the flashing cursor on the first character
of the code rate on line 1. Line 2 displays the data rate. Press [←] or [→] to make the selection.
To select the currently defined variable data rate, select TX-V, and press <ENTER> twice.
To change the rate using the variable rate selection, press <ENTER> when TX-V is displayed. A
flashing cursor is displayed on the first character of the coding type on line 1. Press [←] or [→] to
move the flashing cursor, and [↑] or [↓] to increment or decrement the digit at the flashing cursor.
Press <ENTER> to execute the change.
Notes:
1. When the TX rate has been programmed, the transmitter is automatically turned off to
prevent swamping of other channels. To turn the transmitter on, use the TX-IF Output
function.
2. Code Rate 3/4 not compatible with a combination of a CSC Closed Modulator Type and
Sequential Encoder.
Continuous Mode Data Ranges
Code Rate Data Rate Range
BPSK 1/2 2.4 to 1250 kbps
Offset QPSK 1/2 4.8 to 2500 kbps
Offset QPSK 3/4 7.2 to 3750 kbps
QPSK 7/8 8.4 to 4375 kbps
8-PSK 2/3 64.0 to 5000 kbps
BPSK 1/1 4.8 to 2500 kbps
Offset QPSK 1/1 9.6 to 5000 kbps
BPSK 21/44 2.4 to 1193.181 kbps
BPSK 5/16 2.4 to 781.25 kbps
Offset QPSK 1/2 4.8 to 2386.363 kbps
8-PSK 3/4 384 to 5000 kbps
SNM-1001L Satellite Modem Revision 1
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FUNCTION SELECT: CONFIGURATION: MODULATOR:
TX-IF FREQUENCY (CONDITIONAL)
TX-IF FREQUENCY
1200.0000 MHz
Conditional: This menu is displayed when LO is programmed to 0
IMPORTANT
Programs the modulator transmit frequency between 950 and 1750 MHz, in 100 Hz steps.
Upon entry, the current transmitter frequency is displayed with the flashing cursor on the first
character. Press [←] or [→] to move the flashing cursor, and [↑] or [↓] to increment or decrement
the digit at the flashing cursor. Press <ENTER> to execute the change.
Note: When the transmitter frequency is changed, the transmitter is automatically turned off to
prevent the possible swamping of other channels. To turn the transmitter on, use the TX-IF
Output function.
under Utility: Modulator: TX Terminal LO menu.
FUNCTION SELECT: CONFIGURATION: MODULATOR:
TX TERMINAL FREQUENCY (CONDITIONAL)
TX TERMINAL FREQUENCY
5845.0000 MHz
Conditional: This menu is available only when TX Terminal LO and Mix
IMPORTANT
The reminder of the functions is the same as TX-IF Frequency.
Note: This menu permits programming the TX frequency of the satellite terminal, including the
modem and ODU/BUC. When properly setup, it indicates the frequency radiated toward the
satellite.
4–10
are programmed under Utility: Modulator menu.
SNM-1001L Satellite Modem Revision 1
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FUNCTION SELECT: CONFIGURATION: MODULATOR:
TX-IF OUTPUT
TX-IF OUTPUT
OFF
Programs the modulator output On or Off. Upon entry, the current status of the output is
displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.
FUNCTION SELECT: CONFIGURATION: MODULATOR:
TX POWER LEVEL
TX POWER LEVEL
- 10.0 dBm
Programs the modulator output power level from 0 to -40 dBm
Upon entry, the current transmitter power level is displayed with the flashing cursor on the first
character. Press [↑] or [↓] to increase or decrease the output power level in 0.1 dBm steps. Press
<ENTER> to execute the change.
TX POWER LEVEL
-10.0 dBm (ADJ)
This menu appears when:
1. ODU Power Leveling is On (Utility: Outdoor Unit), or
2. The MOD Power Offset (Utility: Modulator is ≠ 0 dB.).
3. (ADJ) appears after the power level in the TX Power Level screen when this menu is
active.
Notes:
1. When Power Leveling is Enabled, manual changes to the output level are inhibited, and
the menu indicates the TX Power Level TX by the modulator.
2. When MOD power offset is active the output power is adjusted [↑] and [↓] with arrow
keys. However, the value indicated in the display is:
Modulator Power Level + Offset
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FUNCTION SELECT: CONFIGURATION: MODULATOR:
SCRAMBLER
SCRAMBLER
ON
Programs the scrambler On or Off.
Upon entry, the current status of the scrambler is displayed. Press [↑] or [↓] to make the selection.
Press <ENTER> to execute the change.
FUNCTION SELECT: CONFIGURATION: MODULATOR:
DIFF. ENCODER
DIFF. ENCODER
ON
Programs the differential encoder On or Off.
Upon entry, the current status of the scrambler is displayed. Press [↑] or [↓] to make the selection.
Press <ENTER> to execute the change.
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FUNCTION SELECT: CONFIGURATION: MODULATOR:
CARRIER MODE
CARRIER MODE
NORMAL-MODULATED
Programs the modem for alternate carrier modes. All modes, except Normal-Modulated are Test
Modes. Four modes of operation are available:
NORMAL-MODULATED
CENTER-CW
DUAL-CW
OFFSET-CW
Upon entry, the Center mode is displayed. To activate this test mode, press <ENTER>. Press [↑]
or [↓] to select the desired mode. To return to the Configuration menu, press [CLEAR].
This mode is normally selected.
Generates a CW-carrier at the current modulator frequency. This can be used to
measure the output frequency.
Generates a dual side-band suppressed carrier signal. Side-bands are at one-half of
the symbol rate from the carrier. This is used to check the channel balance and
carrier null.
Generates a single, upper, side-band-suppressed carrier signal. The upper sideband is at one-quarter of the symbol rate from the carrier. When inverted spectrum
is selected, this generates a single, lower, side-band-suppressed carrier.
FUNCTION SELECT: CONFIGURATION: MODULATOR:
MODEM REFERENCE
Use only Internal or EXT 10 MHz with a Block Up Converter (BUC) or
IMPORTANT
Upon entry, the current status of the scrambler is displayed. Press [↑] or [↓] to make the selection.
Press <ENTER> to execute the change.
Note: If any EXT REF is selected for the modem reference and is disconnected or not present at
CP3, an alarm is generated, and the modem switches to its Internal Clock.
Outdoor Unit (ODU).
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FUNCTION SELECT: CONFIGURATION: MODULATOR:
FSK OUTPUT
FSK OUTPUT
OFF
Note: FSK is operational only with a BUC or ODU that incorporates FSK capabilities.
Programs the FSK Output On or Off. Upon entry, the current status of the FSK Output is displayed.
Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.
The modem will attempt to communiate with the ODU/BUC when the FSK is tuned On. When the
communicateions are successful the Monitor menu willl indicate the ODU Output Level, ODU
Temperature, ODU, PLL Lock, ODU Software, and ODU Power Class ( for BUCs that support
these parameters). If communications are not established then all of the following are indicated as
faults under the Faults/Alarms: Outdoor Unit menu: Temperature, PLL Lock, and Checksum.
Every 10 seconds the modem will try to re-establish FSK communications. It is possible the address
the modem is using to contast the ODU/BUC differs from the address in the ODU/BUC. Usually the
default address = 1. Check this at the ODU FSK Address menu located under the Utility: Outdoor Unit menu.
FUNCTION SELECT: CONFIGURATION: MODULATOR:
ODU POWER SUPPLY
ODU POWER SUPPLY
OFF
Programs the ODU Power Supply On or Off. DC power is transmitted up the center conductor of the
TX-IF connector. Upon entry, the current status of the ODU Power is displayed. Press [↑] or [↓] to
make the selection. Press <ENTER> to execute the change.
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FUNCTION SELECT: CONFIGURATION: MODULATOR:
ODU OUTPUT DELAY
ODU OUTPUT DELAY
00.00 MIN SEC
Programs the ODU Output delay with 0.0 to 20.00 minutes. At power up, the M&C delays carrier
turn On by the programmed time. During output delay timeout, the front panel carrier On LED
flashes and the ODU output delay screen shows the remaining delay time.
Normally, when using this feature, the ODU 10MHz reference is On and the ODU Power Supply is
On. This allows the ODU or BUC time to warm-up before the carrier is transmitted. Upon entry, the
current status of the ODU Output Delay is displayed. Press [↑] or [↓] to make the selection. Press
<ENTER> to execute the change.
FUNCTION SELECT: CONFIGURATION: MODULATOR:
ODU 10 MHz REF
ODU 10 MHz REF
OFF
Programs the ODU 10 MHz REF On or Off. The reference is transmitted up the center conductor
of the TX-IF connector.
Upon entry, the current status of the ODU 10 MHz REF is displayed. Press [↑] or [↓] to make the
selection. Press <ENTER> to execute the change.
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FUNCTION SELECT: CONFIGURATION: MODULATOR:
RS ENCODER (CONDITIONAL)
RS ENCODER
OFF
Conditional: Reed-Solomon option only.
IMPORTANT
Programs the Reed-Solomon Encoder On or Off.
Upon entry, the current status of the Reed-Solomon encoder is displayed. Press [↑] or [↓] to make
the selection. Press <ENTER> to execute the change.
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4.3.1.2 FUNCTION SELECT: CONFIGURATION: DEMODULATOR
CONFIGURATION
DEMODULATOR
Press <ENTER> to review or edit the following sub-menus.
FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
RX-X CODE/DATA RATE
RX-A QPSK 1/2
64.000 Kbps
RX-B QPSK 1/2
128.000 Kbps
RX-C QPSK 1/2
256.000 Kbps
RX-D QPSK 1/2
512.000 Kbps
RX-V QPSK 1/2
38.400 Kbps
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Upon entry, the current transmitter rate is displayed with the flashing cursor on the first character
of the code rate on line 1. Line 2 displays the data rate. Press [←] or [→] to make the selection.
To select the currently defined variable data rate, select RX-V, and press [ENTER] twice.
To change the rate using the variable rate selection, press [ENTER] when RX-V is displayed. A
flashing cursor is displayed on the first character of the coding type on line 1. Press [←] or [→] to
move the flashing cursor, and [↑] or [↓] to increment or decrement the digit at the flashing cursor.
Press [ENTER] to execute the change.
Notes:
1. When the RX rate has been programmed, the transmitter is automatically turned off to
prevent swamping of other channels. To turn the transmitter on, use the RX-IF Output
function.
2. Code Rate 3/4 not compatible with a combination of a CSC Closed Modulator Type and
Sequential Encoder.
Continuous Mode Data Range
Code Rate Data Rate Range
BPSK 1/2 2.4 to 1250 kbps
Offset QPSK 1/2 4.8 to 2500 kbps
Offset QPSK 3/4 7.2 to 3750 kbps
QPSK 7/8 8.4 to 4375 kbps
8-PSK 2/3 64.0 to 5000 kbps
BPSK 1/1 4.8 to 2500 kbps
Offset QPSK 1/1 9.6 to 5000 kbps
BPSK 21/44 2.4 to 1193.181 kbps
BPSK 5/16 2.4 to 781.25 kbps
Offset QPSK 1/2 4.8 to 2386.363 kbps
8-PSK 3/4 384 to 5000 kbps
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FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
RX-IF FREQUENCY (CONDITIONAL)
RX-IF FREQUENCY
1200.0000 MHz
Conditional: This menu is displayed when LO is programmed to 0
IMPORTANT
Programs the demodulator receive frequency between 950 and 1750 MHz,
in 100 Hz steps.
Upon entry, the current receive frequency is displayed with the flashing cursor on the first
character. Press [←] or [→] to move the flashing cursor, and [↑] or [↓] to increment or decrement
the digit at the flashing cursor. Press <ENTER> to execute the change.
under Utility: Demodulator: RX Terminal LO menu.
FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
RX TERMINAL FREQUENCY (CONDITIONAL)
RX TERMINAL FREQUENCY
4200.0000 MHz
Conditional: This menu is available only when RX Terminal LO and Mix
IMPORTANT
The reminder of the functions is the same as RX-IF Frequency.
Note: This permits programming of the RX frequency of the satellite terminal, including the
modem and LNB. When properly setup it indicates the satellite frequency of the desired RX
carrier received from the satellite.
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FUNCTION SELECT:CONFIGURATION:DEMODULATOR:
DESCRAMBLER
DESCRAMBLER
ON
Programs the descrambler On or Off.
Upon entry, the current status of the descrambler is displayed. Press [↑] or [↓] to make the
selection. Press <ENTER> to execute the change.
FUNCTION SELECT:CONFIGURATION:DEMODULATOR:
DIFF. DECODER
DIFF. DECODER
ON
Programs the differential decoder On or Off.
Upon entry, the current status of the differential decoder is displayed. Press [↑] or [↓] to make the
selection. Press <ENTER> to execute the change.
FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
RF LOOP BACK
RF LOOP BACK
OFF
This is a Test Mode.
IMPORTANT
Programs the modem for RF loopback operation. When RF loopback is turned on, the
demodulator is programmed to the same frequency as the modulator. When RF loopback is turned
off, the demodulator is tuned to the previous frequency. Refer to (Figure 4-4) for a block diagram
of RF loopback operation.
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Note: RF loopback nullifies IF loopback.
Upon entry, the current status of the RF loopback is displayed. Press [↑] or [↓] to make the
selection. Press [ENTER] to execute the change.
CUSTOMER
DATA
REMOTE SERI AL
INTERFACE
FAULT IND ICATORS
DATA
INTERFACE
SATELLITE MODEM
ENCO DER/
MODULATOR
MICRO-
COMP UTER
DEMODULATOR
DECODER
TX = 1200 MHz
SUPPLY
POWER
RX = 1225 MHz
RF LBK = 1200 MHz
LOOPBACK CHANGES DEMOD
RECEIVE FREQU ENCY TO
70 MHz WI THOUT LOSI NG
ORIGINAL PROGRAMMING
INFORMATION.
TRANSMIT RF
EQUIPMENT
AC P OWER
RECEIVE RF
EQUIPMENT
ANTENNA
Figure 4-4. RF Loopback
Note: When RF loopback is turned on, the demodulator receive frequency is programmed to be the same frequency as the modulator transmit
frequency. This test mode will verify the satellite link without changing the programmed frequency of the demodulator. When RF loopback is
turned off, the demodulator is programmed back to the previous frequency.
FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
IF LOOP BACK
IF LOOP BACK
OFF
This is a Test Mode.
IMPORTANT
Programs the modem for IF loopback operation. When IF loopback is turned on, the demodulator
input is connected to the modulator output through an internal attenuator and the modulator
continues to TX a signal. The demodulator is programmed to the same frequency as the
modulator. When IF loopback is turned off, the demodulator is tuned to the previous frequency
and is reconnected to the IF input. Refer to Figure 4-5 for a block diagram of IF loopback
operation.
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Note: IF loopback nullifies RF loopback.
C U S T O M E R
R E M O T E S E R I A L
I N T E R F A C E
F A U L T I N D I C A T O R S
D
A T A
DATA
INTERFACE
A T E L L I T E M O D E M
S
ENCO DER/
MOD UL
TOR
MICR O-
COM PUT ER
DEM ODULATOR/
DECO DE R
POWER S UPP LY
T R
A N S M I T R F
E Q U I P M E N T
AC P O W E R
R E C E I V E R F
E Q U I P M E N T
NTEN N
Figure 4-5. IF Loopback
Note: When IF loopback is turned on, the demodulator is looped back to the modulator inside the modem and the demodulator is
programmed to the same frequency as the modulator. This test mode will verify the operation of the modem. When IF loopback is turned off,
the demodulator is programmed back to the previous frequency and is reconnected to the IF input.
FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
BER THRESHOLD
BER THRESHOLD
NONE
Sets the BER threshold. If the BER threshold set is exceeded, a receive fault will be indicated by
the modem status indicators. BER threshold may be set from 1.0 E-3 to 1.0 E-8, or may be
disabled by specifying NONE.
Upon entry, the current setting of the BER threshold is displayed. Press [↑] or [↓] to select the
desired setting. Press <ENTER> to execute the change.
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FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
SWEEP CENTER
SWEEP CENTER
+ 0 Hz
Programs the sweep center frequency for the directed sweep function. When in directed sweep,
the value from the sweep monitor screen (when the modem was last locked) should be entered for
the sweep center frequency. The sweep center frequency can be set in the range from -75000 to
+75000 Hz.
FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
SWEEP RANGE
SWEEP RANGE
60000 Hz
Programs the overall travel of the sweep width range during acquisition in the directed sweep
mode. The sweep width may be set from 0 to 1,000,000 Hz. When set at 60000 Hz, the modem is
in the default acquisition mode. The smaller the range, the faster the modem will lock, provided
the receive carrier center frequency is within the RX IF frequency sweep range.
Upon entry, the current programmed setting is displayed. Press [←] or [→] to move the flashing
cursor. Press [↑] or [↓] to increment or decrement the digit at the flashing cursor. Press
<ENTER> to execute the change.
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FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
REACQUISITION
REACQUISITION
0 SECONDS
Programs the sweep reacquisition mode time duration. This is the time that the modem will
remain in a narrow sweep after loss of acquisition. After this timer runs out, the modem will
return to the normal acquisition sweep. The reacquisition time is 0 to 999 seconds.
Upon entry, the current programmed setting is displayed with a flashing cursor on the first
character. Press [←] or [→] to move the flashing cursor. Press [↑] or [↓] to increment or
decrement the digit at the flashing cursor. Select the number of seconds desired for the
reacquisition mode. Press <ENTER> to execute the change.
FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
LNB POWER
LNB POWER
OFF
Programs the LNB Power On or Off. The LNB voltage is transmitted up the center conductor of
the RF-IF connector.
Upon entry, the current status of the descrambler is displayed. Press [↑] or [↓] to make the
selection. Press <ENTER> to execute the change.
FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
LNB VOLTAGE
LNB VOLTAGE
13 VDC
Programs the LNB Power at 13, 18, or 24 VDC.
Upon entry, the current status of the descrambler is displayed. Press [↑] or [↓] to make the
selection. Press <ENTER> to execute the change.
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FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
LNB 10 MHZ REF
LNB 10 MHz REF
OFF
Programs the LNB 10 MHz REF to On or OFF. The LNB 10 MHz reference is transmitted out the
center conductor of the RF-IF connector.
Upon entry, the current status of the descrambler is displayed. Press [↑] or [↓] to make the
selection. Press <ENTER> to execute the change.
FUNCTION SELECT: CONFIGURATION: DEMODULATOR:
RS DECODER
RS DECODER
OFF
Programs the Reed-Solomon decoder On, Off, or Correction_Off.
Upon entry, the current status of the Reed-Solomon decoder is displayed. Use [↑] or [↓] to select
one of the following modes:
ON
CORRECTION_OFF
OFF
Press [ENTER] to execute the change.
If none of the proper overhead types or data rates apply, the ReedSolomon decoder in the On state will be rejected (double beep). With
the Reed-Solomon decoder turned On (not off or Correction_ Off), the
IMPORTANT
corrected BER will be reported from the outer decoder (Reed-Solomon
decoder).
Enables the Reed-Solomon decoder to provide data error corrections.
This is the Normal operating Mode.
Turns off the Reed-Solomon decoder data error correction circuitry. Data
flow is then routed through normal data paths without error corrections.
This is a Test Mode.
The RS decoder is normally disabled (off position). To execute any of the
Reed-Solomon decoder modes, enter the desired Reed-Solomon decoder
and select the desired mode. This is a Test Mode.
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4.3.1.3 FUNCTIONSELECT: CONFIGURATION INTERFACE
CONFIGURATION
INTERFACE
Press <ENTER > to review or edit the following sub-menus.
FUNCTION SELECT: CONFIGURATION: INTERFACE:
TX CLOCK SOURCE
TX CLOCK SOURCE
TX TERRESTRIAL
Programs the clock source for the modem transmitter clock to the following
configurations:
TX TERRESTRIAL
SCT (INTERNAL)
EXT. CLOCK/DATA CLOCK
Upon entry, the current transmit clock setting is displayed. Press [↑] or [↓] to make the selection.
Press <ENTER> to execute the change.
Sets the TX clock to recover timing from the incoming clock/data.
Sets the TX clock to operate from the modem internal clock (this is
also the fallback clock).
Note: When loop timing is enabled, SCT (LOOP) is displayed
instead of SCT (INTERNAL).
Sets the TX clock to operate from the external reference clock (Ext
Clock).
TX Data Rate and Ext Clock frequency shall match or unless the
ASLT option is installed. The correct frequency must be
programmed into EXT-CLK FREQ.
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FUNCTION SELECT: CONFIGURATION: INTERFACE:
TX CLOCK PHASE
TX CLOCK PHASE
AUTO
Programs the TX clock phase to AUTO, NORMAL, or INVERT.
Note: AUTO is the default.
Upon entry, the current setting of the TX clock phase is displayed. Press [↑] or [↓] to make the
selection. When AUTO is selected, the modem will automatically select NORMAL or INVERT
to properly phase the TX clock with the TX data. Press <ENTER> to execute the change.
FUNCTION SELECT: CONFIGURATION: INTERFACE:
EXT-CLK FREQ
EXT-CLK FREQ
1544.000 KHz
Programs the EXT REF clock input frequency between 8.000 kHz and 10000.000 kHz.
Notes:
1. When an ODU or BUC is operated with an EXT REF, 10 MHz is required.
2. The clock rate shall be equal to the data rate unless the asymmetrical loop timing option
is present.
This clock frequency can be any multiple of 600 Hz from 2.4 to 64 kHz, and can be any multiple
of 8 kHz from 64 kHz to 4.376 MHz. This can be used for the Doppler/ Plesiochronous buffer
reference. It can be a reference to SCT. Use the master clock input on J8 for the external master
reference. The EXT REF on CP3 only allows for 1, 5, 10, and 20 MHz EXT REF input.
Upon entry, the current setting for the EXT REF is displayed. Press [←] or [→] to increment or
decrement the digit at the flashing cursor. Press <ENTER> to execute the change.
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FUNCTION SELECT: CONFIGURATION: INTERFACE: BUFFER CLOCK
BUFFER CLOCK
RX (SATELLITE)
Programs the interface buffer output clock to one of the following modes:
RX (SATELLITE)
SCT (INTERNAL)
EXT. CLOCK
TX TERRESTRIAL
Upon entry, the current setting of the plesiochronous buffer clock is displayed. Press [↑] or [↓] to
make the selection. Press <ENTER> to execute the change.
Sets the output buffer clock to the satellite clock.
(Bypasses the buffer.)
Sets the buffer clock to operate from the modem internal clock. This is also the
fallback clock
Sets this clock source to the external clock.
Sets the buffer output clock to recover timing from the incoming TX data clock.
FUNCTION SELECT: CONFIGURATION: INTERFACE:
RX CLOCK PHASE
RX CLOCK PHASE
NORMAL
Programs the RX clock phase to Normal or Inverted.
Upon entry, the current status of the RX Clock is displayed. Press [↑] or [↓] to make the
selection. Press <ENTER> to execute the change.
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FUNCTION SELECT: CONFIGURATION: INTERFACE:
B-BAND LOOP BACK
B-BAND LOOP BACK
OFF
This is a Test Mode.
IMPORTANT
Programs the modem for baseband loopback operation. When baseband loopback is turned on,
the data and timing signals are switched from the demodulator to the modulator on the modem
side of the interface. The DTE baseband signals are also looped back from the transmitter data
and clock to receiver data and clock on the customer side of the interface. This is a bi-directional
loopback of the baseband data. Refer to Figure 4-6 for a block diagram of baseband loopback
operation.
C U S T O M E R
A T A
D
R E M O T E S E R I
I N T E R F
C E
A U L T I N D I C A T O R S
F
DATA
I N T E R F
A C E
L
T EL L I T E M O D E M
S
ENCODER/
TOR
MODUL
MICRO-
COMPUTER
DEMODULATOR/
DECODER
POWER SUPPLY
A N S M I T R F
T R
E Q U I P M E N T
C P O W E R
R E C E I V E R F
E Q U I P M E N T
NTENN
Figure 4-6. Baseband Loopback
Note: When baseband loopback is turned on, data is looped back on the customer side of the interface. This is a bi-directional loopback
of the baseband data. This test mode will verify the customer equipment and cabling between the modem and the customer equipment.
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FUNCTION SELECT: CONFIGURATION: INTERFACE:
INTRFC LOOP BACK (CONDITIONAL)
INTRFC LOOP BACK
OFF
This is a Test Mode.Conditional:This menu is only available when the
IMPORTANT
Programs the modem for Interface Loopback operation. When INTERFACE LOOPBACK is
turned on, data is looped back at the modem side of the interface. This is a bi-directional loop
back of the data after the base band data has had the overhead added. Refer to Figure 4-7 for the
interface loopback block diagram.
Upon entry, the current status is displayed. [↑] or [↓] to make the selection. Press [ENTER] to
execute the change.
overhead interface PCB or Reed-Solomon PCB is installed.
C U S T O M E R
A T A
D
R E M O T E S E R I
A C E
I N T E R F
F
U L T I N D I C A T O R S
A L
DATA
A C E
I N T E R F
T E L L I T E M O D E M
S
ENCODER/
TOR
MODUL
MICRO-
COMPUTER
DEMODULATOR/
DECODER
POWER SUPPLY
A N S M I T R F
T R
E Q U I P M E N T
C P O W E R
R E C E I V E R F
E Q U I P M E N T
NTENN
Figure 4-7. Interface Loopback
Note: When interface loopback is turned on, data is looped back on the modem side of the interface. This test mode will verify the internal
channel unit interface operation.
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FUNCTION SELECT: CONFIGURATION: INTERFACE:
BUFFER SIZE (CONDITIONAL)
Conditional: The Bits or Milliseconds menu is displayed depending
upon whether Bits or Milliseconds is selected under the Utility:
IMPORTANT
Interface Buffer Program menu.
BUFFER SIZE
384 BITS
BUFFER SIZE
6 MILLI SECONDS
Sets the size of the buffer in either Bits or Milliseconds..
Upon entry, the current buffer length is displayed. Press [↑] or [↓] to select the desired buffer
size. The buffer size is displayed in seconds or bits. Enter the Utility Interface menu to change the
buffer units to seconds or bits.
• If selecting seconds, choose from 1 to 99 ms, in increments of 1 ms ≤ 2.6 Mbps or 0
(Bypass).
• If selecting bits, choose from 32 to 262144 bits, in increments of 16 bits.
• Press [ENTER] to execute the change.
Note: To have the modem calculate the plesiochronous shift, set the buffer units to ms. When a
specific buffer depth is desired, set the buffer units to bits. Select bits or ms from the Utility: Interface menu.
FUNCTION SELECT: CONFIGURATION: INTERFACE:
BUFFER CENTER
BUFFER CENTER
YES/NO
This configuration function is used to center the buffer. Choosing YES centers the buffer.
Press <ENTER> twice to center the buffer.
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FUNCTION SELECT: CONFIGURATION: INTERFACE:
LOOP TIMING
LOOP TIMING
OFF
The On setting programs the transmit clocking to the RX satellite clock. TX and RX data rates
must be equal unless the asymmetrical loop timing (ASLT) option is enabled. SCT is phase
locked to the RX Satellite clock.
FUNCTION SELECT: CONFIGURATION: INTERFACE:
TX DATA FAULT (CONDITIONAL)
TX DATA FAULT
NONE
Conditional: This menu is only available when the overhead interface
IMPORTANT
Transmit data fault. Press [↑] or [↓] to select one of the following modes:
NONE
ALARM INDICATION SIGNAL (AIS)
DATA
Upon entry, the current TX data fault that is being monitored is displayed. Press [↑] or [↓] to make
the selection. Press [ENTER] to execute the change.
PCB is installed.
The transmit interface fault Data/AIS is not activated.
Sets transmit interface fault Data/AIS to monitor a fault condition of
all 1s from customer data input to the modem.
Sets transmit interface fault Data/AIS to monitor a fault condition of
all 1s or 0s. This is referred to as a data-stable condition, which
means that the data is not transitioning.
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4.3.1.4 Function SELECT: CONFIGURATION: LOCAL AUPC
(Conditional)
CONFIGURATION
LOCAL AUPC
Conditional:This menu is displayed when Local Modem AUPC = ON
IMPORTANT
The menu is available in several modes:
Self-Monitoring AUPC with 1 Modem:
Remote AUPC between 2 Modems:
Press <ENTER> to review or edit sub-menus that follow. The selections are On or Off.
located under the Utility: Modem Type menu.
In this mode ASYNC is not used. This does not require the
Overhead card or the Reed-Solomon cards.
The optional Reed-Solomon cards are installed and the Modem
Type is AUPC located under Utility: Modem Type menu.
FUNCTION SELECT: CONFIGURATION: LOCAL AUPC:
AUPC ENABLE (CONDITIONAL)
AUPC ENABLE
OFF
Conditional:This menu is displayed when Local Modem AUPC = ON
IMPORTANT
Programs the AUPC On or Off.
Upon entry, the current status is displayed. Press [↑] or [↓] to make the selection. Press
<ENTER> to execute the change.
located under the Utility: Modem Type menu.
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FUNCTION SELECT: CONFIGURATION: LOCAL AUPC:
NOMINAL POWER (CONDITIONAL)
NOMINAL POWER
-10.0 dBm
Conditional:This menu is displayed when Local Modem AUPC = ON
IMPORTANT
Programs the nominal power value of the AUPC. The nominal power value can range from 0 to 40 dBm, in 0.5 dBm steps.
Upon entry, the current nominal power value is displayed. Press [↑] or [↓] to increment or
decrement the digit at the flashing cursor. Press <ENTER> to execute the change.
located under the Utility: Modem Type menu.
FUNCTION SELECT: CONFIGURATION: LOCAL AUPC:
MINIMUM POWER (CONDITIONAL)
MINIMUM POWER
-30.0 dBm
Conditional:This menu is displayed when Local Modem AUPC = ON
IMPORTANT
Programs the minimum power level of the AUPC. The minimum power level can range from 0 to
-40 dBm, in 0.5 dBm steps.
located under the Utility: Modem Type menu.
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SNM-1001L Satellite Modem Revision 1
Front Panel Operation MN/SNM1001L.IOM
FUNCTION SELECT: CONFIGURATION: LOCAL AUPC:
MAXIMUM POWER (CONDITIONAL)
MAXIMUM POWER
-5.0 dBm
Conditional:This menu is displayed when Local Modem AUPC = ON
IMPORTANT
Programs the maximum power level of the AUPC. The maximum power level can range from 0 to
-40 dBm, in 0.5 dBm steps.
FUNCTION SELECT: CONFIGURATION: LOCAL AUPC:
TARGET EB/NO (CONDITIONAL)
located under the Utility: Modem Type menu.
Conditional: This menu is displayed when Local Modem AUPC = ON
located under the Utility: Modem Type menu.
IMPORTANT
Programs the E
16.0 dB, in 0.1 dB steps
Manufacturer does not recommend a setting greater than 15.5 dB.
target set point. The Eb/N0 target set point ranges from 3.2 to
b/N0
TARGET EB/NO
6.0 dB
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SNM-1001L Satellite Modem Revision 1
Front Panel Operation MN/SNM1001L.IOM
FUNCTION SELECT: CONFIGURATION: LOCAL AUPC:
TRACKING RATE (CONDITIONAL)
TRACKING RATE
5.0 dB/Min
Conditional:This menu is displayed when Local Modem AUPC = ON
IMPORTANT
Programs the maximum tracking rate of the AUPC.
Maximum tracking rate can range from 0.5 to 6.0 dBm/minute, in 0.5 dBm/minute steps.
located under the Utility: Modem Type menu.
FUNCTION SELECT: CONFIGURATION: LOCAL AUPC:
LOCAL CL ACTION (CONDITIONAL)
LOCAL CL ACTION
HOLD
Conditional:This menu is displayed when Local Modem AUPC = ON
IMPORTANT
Programs the Local Carrier Loss action (CL) for HOLD, NOMINAL, or MAXIMUM. The
modulator at the local carrier end moves to this value upon carrier loss.
HOLD
NOMINAL
MAXIMUM
located under the Utility: Modem Type menu.
Upon Carrier Loss (CL) the carrier level remains at the level just before carrier loss.
Upon CL the TX Carrier Level reverts to the Nominal Power Level programmed
under Configuration: Local AUPC: Nominal Power
Upon CL the TX Carrier Level is programmed to the level programmed under
Configuration: Local AUPC: Maximum Power.
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