IMPORTANT NOTE: The information contained in this document supercedes all previously published
information regarding this product. Product specifications are subject to change without prior notice.
Part Number MN/CDM600.IOM Revision 7
Page 2
Page 3
Errata A
Comtech EF Data Documentation Update
Subject:
Date:
Document:
Part Number:
Collating Instructions:
Comments:
The following changes affects the values shown on page 6-9 and 16-13.
Change AUPC Parameters in Remote Control
November 23, 2005
CDM-600 Open Network Satellite Modem (2.4 kbps – 20 Mbps)
Installation and Operation Manual
Revision 7, dated February 9, 2005
MN/CDM600.EA7
Attach this page to page 16-13
Change Specifics:
Change to AUPC Target Eb/No Parameter
Since Revision 7 of the CDM-600 Manual was published, the range of the value of target Eb/No has been
increased. Effective in firmware version 2.1.1 and subsequent:
• Previously the maximum value was 9.9 dB
• New maximum value is 14.9 dB.
This affects the front panel and the remote control, refer to the remote control command table for more
detail.
Defines AUPC operating parameters. Has the form abc.cd,
where:
a=Defines action on max. power condition.
(0=do nothing, 1=generate Tx alarm)
b=Defines action on remote demod unlock.
(0=go to nominal power, 1=go to max power)
c.c=target Eb/No value, for remote demod, from 0.0 to
14.9 dB, where numbers above 9.9 use hex
representation for the 1 st character, ie 14.9 is
coded as E.9.
d =Max increase in Tx Power permitted, from
0.0 to 9.0 dB
Example: APP=015.67 (Sets no alarm, max power, 5.6 dB
target Eb/No and 7 dB max power increase.
The following changes affects the values shown on page 15-9.
Revised Miscellaneous Table
April 18, 2006
CDM-600 Open Network Satellite Modem (2.4 kbps – 20 Mbps)
Installation and Operation Manual
Revision 7, dated February 9, 2005
MN/CDM600.EB7
Attach this page to page 15-9
Change Specifics:
15.2 Miscellaneous
Front panel Tactile keypad, 6 keys (Up/Down, Left/Right, Enter/Clear)
Loopbacks Internal IF loopback, RF loopback, digital loopback, and inward/outward loopback
Fault relays Hardware fault, Rx and Tx Traffic Alarms, Open Network Backward Alarms
M&C Interface EIA-232 and EIA-485 (addressable multidrop, 2-wire or 4-wire)
M&C Software SATMAC or CMCS software for control of local and distant units
Dimensions 1U high, 12 inches (305 mm) deep
Weight 10 lbs (4.5 kgs) max
AC consumption 25 watts (typical) 55 watts (maximum)
Operating voltage 100 - 240 volts AC, +6%/-10% - autosensing
Operating temperature 0 to 50oC (32 to 122oF)
Vacuum Fluorescent Display (blue) - 2 lines of 40 characters
Type: Form C Contacts. Rating: Less than ± 15 volts up to 1 Amp
July 12, 2006
CDM-600 Open Network Satellite Modem (2.4 kbps – 20 Mbps)
Installation and Operation Manual
Revision 7, dated February 9, 2005
MN/CDM600.EC7
Attach this page to page 15-3
Change Specifics:
CDM-600 Satellite Modem Revision 7
Summary of Specifications MN/CDM600.IOM
Highlighted Input Power Range changes are as follows:
Change Specifics:
Changed Input Power Range
July 18, 2006
CDM-570/570L Satellite Modem with Optional IP Module,
Installation and Operation Manual, Rev. 4, dated April 12, 2006
MN/CDM-570L.ED4
Attach this page to page 12-3
12.2 Demodulator
Data rate range, operating modes, de-scrambling, input impedance/return loss etc., as per
Modulator
+35 dBc maximum composite, up to -5 dBm, absolute max.
+40 dBc maximum composite, up to –10 dBm, absolute max.
Filename: T_ERRATA 1
Page 8
Filename: T_ERRATA 2
Page 9
Errata E
Comtech EF Data Documentation Update
Subject:
Date:
Document:
Part Number:
Collating Instructions:
Comments:
Chnaged slope of curves for TPC 7/8 for Figure 7-5. The following table highlights the changes
to the BER curve.
Changed Figure 7-5, TPC Curve for Rate 7/8
July 27, 2006
CDM-570/570L Satellite Modem with Optional IP Module,
Installation and Operation Manual, Rev. 4, dated April 12, 2006
MN/CDM-570L.EE4
Attach this page to page 7-14
Change Specifics:
TURBO PRODUCT
CODEC
Rate 7/8 QPSK
Rate 7/8 8-PSK
Rate 7/8 16-QAM
BER
(With two adjacent
carriers, each 7 dB
higher than the
desired carrier)
For:
BER=10
BER=10-8
Rate 7/8 (Q, OQ)
Guaranteed Eb/No:
(typical value in
parentheses)
-5
4.3 dB (4.0 dB)
4.5 dB (4.2 dB)
Rate 7/8 (8-PSK)
Guaranteed Eb/No:
(typical value in
parentheses)
7.0 dB (6.6 dB)
7.2 dB (6.8 dB)
Rate 7/8 (16-QAM)
Guaranteed Eb/No:
(typical value in
parentheses)
8.1 dB (7.7 dB)
8.3 dB (7.9 dB)
Filename: T_ERRATA 1
Page 10
Eb/No in dB
1 2 3 4 5 6 7 8 9 10 11 12
1E-1
Comtech Turbo Product Codec
1E-2
1E-3
1E-4
1E-5
1E-6
Uncoded
BPSK/QPSK
Spec limit
Rate 7/8
QPSK/OQPSK
Rate 7/8 QPSK/OQPSK,
8-PSK and 16-QAM
Uncoded
16-QAM
Spec limit
Rate 7/8
8-PSK
Uncoded
8-PSK
1E-7
Spec limit
Rate 7/8
16-QAM
1E-8
Typical performance
1E-9
1 2 3 4 5 6 7 8 9 10 11 12
BER
Figure 7-5. Comtech EF Data Turbo Product Codec
Rate 7/8 QPSK/OQPSK, 8-PSK AND 16-QAM
Filename: T_ERRATA 2
Page 11
Comtech EF Data Documentation Update
Subject:
Date:
Document:
Part Number:
Collating Instructions:
Comments:
15.9 AGC Voltage
Note: This is for reference only.
Added Chart for AGC Voltage
November 2, 2006
CDM-600 Open Network Satellite Modem (2.4 kbps – 20 Mbps)
Installation and Operation Manual
Revision 7, dated February 9, 2005
MN/CDM600.EF7
Attach this page to page 15-10
The revised index is presented on the following pages.
Revised Remote Command Index
June 14, 2007
CDM-600 Open Network Satellite Modem (2.4 kbps – 20 Mbps)
Installation and Operation Manual
Revision 7, dated February 9, 2005
MN/CDM600.EG7
Attach this page to page 16-6
PREFACE................................................................................................................................... XI
Customer Service .......................................................................................................................................xi
About this Manual ....................................................................................................................................xii
Conventions and References ....................................................................................................................xii
EMC (Electromagnetic Compatibility)................................................................................................... xv
Warranty Policy ....................................................................................................................................... xvi
CHAPTER 1.
1.1 Standard Features....................................................................................................................... 1–2
Figure 4-1. Front Panel ............................................................................................................................4–1
Figure 7-5. Viterbi with concatenated R-S Outer Code .........................................................................7–17
Figure 7-6. Sequential with concatenated R-S Outer Code................................................................... 7–18
Figure 7-7. 8-PSK/TCM Rate 2/3 with and without concatenated RS Outer Code ...............................7–19
Figure 7-8. Comtech EF Data Turbo Product Codec Rate 3/4 QPSK/OQPSK, 8-PSK and 16-QAM.. 7–20
Figure 7-9. Comtech EF Data Turbo Product Codec Rate 7/8 QPSK/OQPSK, 8-PSK and 16-QAM.. 7–21
This manual provides installation and operation information for the Comtech EF Data
CDM-600 satellite modem. This is a technical document intended for earth station
engineers, technicians, and operators responsible for the operation and maintenance of
the CDM-600.
Conventions and References
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.
Cautions and Warnings
Indicates information critical for proper equipment
function.
IMPORTANT
WARNING indicates a potentially hazardous situation that,
WARN ING
if not avoided, could result in death or serious injury.
Recommended Standard Designations
Recommended Standard (RS) designations are equivalent to the new designation of the
Electronic Industries Association (EIA). Manuafacturer has determined to use only one
reference throughout the manual. However, there may be an instance on illustrations that
either designator may be used.
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 Technical
Publications Department: techpub@comtechefdata.com.
The CDM-600 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 100 - 240 volts AC. It has a
maximum power consumption of 40 watts, and draws a maximum of 400 mA.
The user should observe the following instructions:
IMPORTANT
Fuses
The CDM-600 is fitted with two fuses - one each for line and neutral connections. These
are contained within the body of the IEC power inlet 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.
FOR CONTINUED OPERATOR SAFETY, ALWAYS REPLACE THE FUSES
WITH THE CORRECT TYPE AND RATING.
Environmental
The CDM-600 must not be operated in an environment where the unit is exposed to
extremes of temperature outside the ambient range 0 to 50°C, 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.
The installation and connection to the line supply must be made in compliance to local or
national wiring codes and regulations.
The CDM-600 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 CDM-600 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 CDM-600 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 CDM-600 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 (BNC 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 2 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.
xvi
Page 33
Chapter 1. INTRODUCTION
The CDM-600 (Figure 1-1) is an Open Network Satellite Modem, intended for both
Intelsat and closed network applications.
• It is compliant with IESS-308/309/310/315 specifications, but also adds
significant other features in closed network modes.
• It offers variable data rates from 2.4 to 20 Mbps, in BPSK, QPSK, Offset QPSK,
8-PSK, 8-QAM and 16-QAM modes. Viterbi, Sequential, concatenated ReedSolomon (RS), Trellis Coded Modulation (TCM), Turbo Product Coding (TPC)
and Low-density Parity Check Coding (LDPC) are provided as Forward Error
Correction (FEC) options.
• A full range of interface types is built in (no plug in cards required) including all
G.703 types, and Drop and Insert (both Open and Closed Network) operation
are available.
• The IF frequency range simultaneously covers 52 - 88 MHz and 104 - 176 MHz.
(Units manufactured after February 2005 cover 50 - 90 MHz and 100 - 180 MHz.
The opening screen shows CDM-600(E)- meaning Extended IF range. )
• The modem is compact, 1U high and 12 inches deep, and consumes only 25
watts (typical).
• It has a front panel VFD display and keypad for local configuration and control,
although it can be fully remote-controlled.
The CDM-600 provides a wealth of standard features which go far beyond the basic
requirements of the Intelsat specifications.
• Low rate variable data rates – 2.4 kbps to 5.0 Mbps
• Mid-rate variable data rates – 2.4 kbps to 10.0 Mbps
• High-rate variable data rates – 2.4 kbps to 20.0 Mbps
• Embedded Distant-end Monitor and Control (EDMAC) (see Note)
• Selectable 50Ω / 75Ω IF port impedance
• Asymmetric Loop Timing
• Automatic Uplink Power Control (AUPC)
• Software – Flash Upgrading
• Modulation Types –BPSK, QPSK, and OQPSK
• 1:1 and 1:10 redundancy switches
Note: In this mode, an additional 5% overhead is combined with the traffic data,
(1.5% in Turbo BPSK modes, Turbo Rate 1/2 QPSK/OQPSK, and all data rates greater
than 2 Mbps) which permits Monitor & Control (M&C) information to be added
(transparently to the user), allowing access to the distant-end modem. This mode does not
require any additional cabling at either the local or distant-end Modems - access to
EDMAC is via the standard M&C control port. Full M&C is possible, and importantly,
the on/off status of the carrier at the distant-end carrier can be controlled. In addition, for
firmware version 1.5.0 and higher, the proprietary D&I++ framing mode is available.
This combines Drop & Insert (D&I) operation with a similar EDMAC link and a 2.2%
overhead.
1.1.1 AUPC
An important innovation in the CDM-600 is the addition of Automatic Uplink Power
Control (AUPC). This feature enables the modem to automatically adjust its output
power to maintain the Eb/No of the remote end of the satellite link constant. This
provides protection against rain fading, a particularly severe problem with Ku-band links.
To accomplish this, either the EDMAC or D&I++ framing types may be used, and the
distant end modem constantly sends back information about the demodulator Eb/No
using reserved bytes in the overhead structure. Using the Eb/No, the local modem then
adjusts its output power, and hence, a closed-loop feedback system is created over the
satellite link.
A benefit of this feature is that whenever EDMAC or D&I++ with AUPC operation is
selected, the remote demodulator’s Eb/No can be viewed from the front panel display of
the local modem. Note that EDMAC and D&I++ can be used in conjunction with either
framing type.
The internal software is both powerful and flexible, permitting storage and retrieval of up
to 10 different modem configurations. The modem uses ‘flash memory’ technology
internally, and new firmware can be uploaded to the unit from an external PC. This
simplifies software upgrading, and updates can now be sent via the Internet, e-mail, or on
disk. The upgrade can be performed without opening the unit, by simply connecting the
modem to the serial port of a computer. Refer to Chapter 13 Flash Upgrading for
additional information.
1.1.3 Verification
The unit includes many test modes and loopbacks for rapid verification of the correct
functioning of the unit. Of particular note is the IF loopback, which permits the user to
perform a quick diagnostic test without having to disturb external cabling. During the
loopback, all of the receive configuration parameters are temporarily changed to match
those of the transmit side, and an internal RF switch connects the modulator output to the
demodulator input. When normal operation is again selected, all of the previous values
are restored.
1.1.4 Data Interfaces
The CDM-600 includes, as standard, a universal data interface that eliminates the need to
exchange interface cards for different applications. The interfaces offered include:
• EIA-422 (EIA530) DCE (at rates up to 10 Mbps)
• X.21 DTE and DCE (at rates up to 10 Mbps)
• V.35 DCE (at rates up to 10 Mbps)
• Synchronous EIA-232 DCE (at rates up to 300 kbps)
• G.703 E1, balanced and unbalanced
• G.703 T1, balanced
• G.703 E2, balanced and unbalanced
• G.703 T2, balanced
• Serial LVDS (at rates up to 20 Mbps)
• Dual Audio, 600Ω (produces a single 64 kbps IBS data stream)
AS/11229-1 Modem Card – Extended IF bandwidth - units manufactured after February 2005
AS/0424-1 Modem Card – Standard IF bandwidth - units manufactured before February 2005
AS/0463 Turbo Codec – low rate
AS/9436 Turbo Codec – high rate
PL/9076-1 Baseband Framing Card
PL/9122-1 Chassis
PL/10290 High Stability Reference (Part of KT/9585-1)
PL/10341-1 LDPC and Hight RateTurbo Codec
KT/9585-1 High Stability Reference (Consult factory for availability)
1.3 FAST Options and Hardware Options
The CDM-600 is extremely flexible and powerful, and incorporates a large number of
optional features. Some customers may not require all of these features, and therefore, in
order to permit a lower initial cost, the modem may be purchased with only the desired
features enabled. If, at a later date, a customer wishes to upgrade the functionality of a
modem, Comtech EF Data provides a system known as FAST (Fully Accessible System Topology) which permits the purchase and installation of options through the use of
special authorization codes, entered through the front panel, or remotely.
The base unit is equipped with Viterbi, Sequential and R-S codecs. It offers BPSK,
QPSK, and OQPSK modulation types, and data rates up to 5.0 Mbps, with all interface
types. It is, however, limited to Closed Network operation, but includes EDMAC and
AUPC.
The following table shows what other options are available:
Option
Option Description and Comments
Low Rate Variable Data rate 2.4 kbps to 5.0 Mbps BASE UNIT
Mid-Rate Variable Data rate 2.4 kbps to 10.0 Mbps FAST
Full Rate Variable Data rate 2.4 kbps to 20.0 Mbps FAST
8-PSK Modulation Type
(includes 8-QAM if the TPC / LDPC Codec
is installed)
16-QAM Modulation Type FAST
High Rate IBS ESC 20 bits per Frame FAST
IBS Intelsat Business Services – IESS-309 FAST
IDR Intermediate Data Rate – IESS-308 FAST
D&I Drop and Insert (includes D&I++) FAST
Dual Audio mode 2 x 32 kbps ADPCM Audio as primary data FAST
Turbo Codec – Low Rate (1st Gen) 5 Mbps TPC Codec Hardware
Turbo Codec – High Rate (2nd Gen) 20 Mbps TPC Codec Hardware
TPC / LDPC Codec 20 Mbps TPC/LDPC Codec Hardware
LDPC (Mid-Rate) Data rate to 10 Mbps FAST
LDPC (High-Rate) Data rate to 20 Mbps FAST
High Stability Reference Internal/External 10 MHz reference - 2 x 10-8 Hardware
Installation
method
FAST
In order to operate in Turbo (TPC) Mode:
To operate in the the Low Rate range (up to 5 Mbps), the modem requires any of the
three Codec cards to be installed.
To operate in the Mid- or High-Rate ranges (up to 10 or 20 Mbps), the modem requires
either the High Rate TPC Codec or the TPC / LDPC Codec to be installed.
In order to operate in LDPC Mode:
The unit will require the TPC/LDPC Codec to be installed. In the base configuration this
will provide LDPC up to 5 Mbps. In order to operate at higher data rates, there are two
additional FAST options available that permit operation up to 10 Mbps or 20 Mbps. Note
that these are in addition to the base modem rate options.
In order to operate in 8-QAM mode:
The modem will require the TPC/LDPC Codec to be installed and have the 8-PSK / 8QAM FAST option enabled.
For example, if LDPC operation at 20 Mbps, 8-QAM mode is required, the modem must
be configured with the following:
Comtech EF Data’s FAST system allows immediate implementation of different options
through the user interface keypad. All FAST options are available through the basic
platform unit.
1.3.2 FAST System Theory
FAST is an enhancement feature available in Comtech EF Data products, enabling onlocation upgrade of the operating feature set - in the rack - without removing a modem
from the setup. When service requirements change, the operator can upgrade the topology
of the modem to meet those requirements within minutes after confirmation by Comtech
EF Data. This accelerated upgrade can be accomplished only because of FAST’s
extensive use of programmable devices incorporating Comtech EF Data-proprietary
signal processing techniques. These techniques allow the use of a unique access code to
enable configuration of the available hardware. The access code can be purchased at any
time from Comtech EF Data. Once obtained, the access code is loaded into the unit
through the front panel keyboard or the rear remote port.
With the exclusive FAST technology, operators have maximum flexibility for enabling
functions as they are required. FAST allows an operator to order a modem precisely
tailored for the initial application.
1.3.3 Implementation
FAST is factory-implemented in the modem at the time of order. Hardware options for
basic modems can be ordered and installed either at the factory or in the field. The
operator can select options that can be activated easily in the field, depending on the
current hardware configuration of the modem. The Activation Procedure is described in
Appendix C.
1) Low Rate (1
module). This is capable of data rates up to 5 Mbps, and code rates limited to Rate
5/16 (BPSK, Rate 21/44 (BPSK) and Rate 3/4 (QPSK, OQPSK, 8-PSK and 16QAM).
2) High Rate (2
module). This is capable of data rates up to 20 Mbps, and adds Rate 7/8 and Rate
0.95 capability.
3) Combination Low-density Parity Check (LDPC) and TPC Codec - a plug-in
daughter card (SIMM module). This is capable of data rates up to 20 Mbps, and
provides Rate 1/2, Rate 2/3 and Rate 3/4 code rates across the range of modulation
types.
4) Internal/External High Stability Reference that provides a frequency stability of 2 x
-8
10
. This may be fitted in the factory at the time of order, or fitted in the field as an
upgrade (provided the CDM-600 was manufactured after a certain date - consult the
factory for further information).
* The option provides an additional connector on the rear panel to permit the
connection of a high-stability external reference signal, which in turn will phase-lock
all of the internal frequency generation circuits of the CDM-600, including the IF
synthesizers.
* The new connector is an SMA female type, located at the extreme right of the rear
panel (when looking at the rear panel). This connector accepts signals at 1, 2, 5, 10 or
20MHz, over the range -5 dBm to +15 dBm, and is matched for both 50 and 75 Ω
systems. The frequency is selected from either the front panel, or over the remote
control interface.
* If the user selects external reference operation, the unit expects to see an
appropriate signal at this connector. If the monitor circuit does not sense a signal at
the connector, a Traffic Alarm is generated, and the High-Stability Internal Reference
(stability of 5 x 10
* If the user selects Internal Reference, the user may then adjust the exact frequency
of the reference using the front panel, or the remote control interface.
* In External mode the High-Stability Internal/External Reference Module works by
phase-locking the Internal Reference to the externally applied signal. If for some
reason (perhaps an incorrect frequency being applied) the PLL circuit senses a loss of
lock, a Unit Alarm is generated, and the TX carrier will be muted.
* Because the High-Stability Internal Reference is comprised of an Ovenized Crystal
Oscillator (OCXO) there is a warm up period associated with this scheme. The user
st
Generation) Turbo Product Codec - a plug-in daughter card (SIMM
st
Generation) Turbo Product Codec - a plug-in daughter card (SIMM
may select, either from the front panel, or via the remote control, to have the unit:
Power-up instantly (in which case the frequency of the unit will drift until the
oven has reached its correct operating temperature),
OR:
Select a warm-up delay, where the unit will not become operational until the
oven has reached a temperature close to stabilization value.
Notes :
* The CDM-600 uses an intelligent algorithm that takes into account the internal
temperature of the unit, and the amount of time it has been powered down. In this
way, the unit does not wait for the full period (which can be as much as 200
seconds) if power is cycled over a short time.
* If the warm-up feature has been activated, the time-out period can be instantly
terminated by pressing the CLEAR key on the front panel.
1.3.5 Supporting Hardware and Software
For 1:1 applications the CDM-600 is supported by the CRS-150, a low-cost external
switch. For Hub applications, the CDM-600 is supported by a low-cost 1:N switch, the
CRS-300.
The CDM-600 is a companion product for the Comtech EF Data line of RF Transceivers.
The Modem incorporates an FSK serial link that can be activated on the Receive IF port
for the purpose of communicating with a Transceiver, if connected. In this manner, a user
may monitor, configure, and control the Transceiver, using the front panel display and
keypad of the Modem. The EDMAC channel may also be used to convey M&C data to a
Transceiver at the distant end of a satellite link, if it is connected to a CDM-600.
The CDM-600 is supported by Comtech EF Data’s SatMac software, a Windows
based application that provides a ‘point and click’ interface for complete systems of
Comtech equipment, comprising Modems, Transceivers, and Redundancy Switches. For
more information, or to order a free demo disk, please contact the factory.
1.4 Compatibility
The CDM-600 is fully backwards-compatible with the Comtech EF Data CDM-500,
CDM-550, and CDM-550T modems. Being an Open Network Modem, the CDM-600 is
fully compatible with modems from other manufacturers that are compliant with the
IESS-308/309/310/314 specifications. Note, however, that IESS-315 (VSAT Turbo)
defines closed network operation, and this therefore requires modems from the same manufacturer at both ends of the link.
Revision 7 of this document includes information on the the following new features:
* Low-Density Parity Check (LDPC) Codec (available in Firmware Version 1.6.0
onwards). This is the latest form of Forward Error Correction, giving enhanced
performance when compared to some TPC modes. This is a plug-in module that also
includes all of the 2
Firmware Version 1.6.0 onwards. Please see Chapter 7 for more details.
* 8-QAM – a new modulation scheme included specifically to replace 8-PSK when
LDPC is used. It is only available when the LDPC codec is installed, and is supported in
Firmware Version 1.6.0 onwards. Please see Chapter 7 for more details.
* A higher-throughput ESC type, called ESC++ . This new mode permits an async ESC
rate of up 38.4 kbaud at a user data rate of 512 kbps (up to 4.8 kbaud at 64 kbps), while
simultaneously permitting AUPC operation. This naturally uses more overhead than
previous modes, although the percentage overhead reduces significantly at higher data
rates. This is now a standard feature in Firmware Version 2.0.1 onwards. Please see
Chapter 13 for more details.
* Extended IF frequency range (50 - 90 MHz and 100 - 180 MHz) for modems
manufactured after February 2005. A new modem card has been developed for this wider
IF bandwidth, which replaces the previous design. CDM-600 modems fitted with this
new card are identified in the opening screen as CDM-600(E), where the ‘E’ refers to
Extended IF range. In addition to the new card, the modem requires Firmware Version
2.0.1 or higher.
* A Power-On, Carrier-Off (POCO) feature has been added to the Factory Menu.
* When this option is set to OFF, the CDM-600 will power-up with the Tx
Carrier in the last known state. (For example, if the Tx Carrier was ON, and then
the power is cycled, the Tx Carrier will be turned ON once more.)
NOTE THAT THIS IS THE DEFAULT OPERATING MODE OF THE
CDM-600, AND IT IS RECOMMENDED THAT THE USER LEAVE THE
UNIT CONFIGURED IN THIS WAY.
* When this option is set to ON, the CDM-600 will always power-up with the
Tx Carrier in the OFF state. The user must then, either through the front panel, or
the remote control port, turn the Carrier ON in order for the unit to transmit a
carrier.
Consult the factory for details of how to access the Factory Menu.
nd
Generation TPC functionality. This new codec is supported in in
Inspect shipping containers for damage. If shipping containers are damaged, keep them
until the contents of the shipment have been carefully inspected and checked for normal
operation.
The modem and manual are packaged in pre-formed, reusable, cardboard cartons
containing foam spacing for maximum shipping protection.
Do not use any cutting tool that will extend more than 1 inch into the
container. This can cause damage to the modem.
CAUTION
Unpack the modem as follows:
1. Cut the tape at the top of the carton indicated by OPEN THIS END.
2. Remove the cardboard/foam space covering the modem.
3. Remove the modem, manual, and power cord from the carton.
4. Save the packing material for storage or reshipment purposes.
5. Inspect the equipment for any possible damage incurred during shipment.
6. Check the equipment against the packing list to ensure the shipment is correct.
7. Refer to the following sections for further installation instructions.
If the CDM-600 is to be mounted in a rack, ensure that there is adequate clearance for
ventilation, particularly at the sides. In rack systems where there is high heat dissipation,
forced air cooling must be provided by top or bottom mounted fans or blowers. Under no
circumstance should the highest internal rack temperature be allowed to exceed 50°C
(122°F).
The CDM-600 CANNOT have rack slides mounted to the side of the
chassis - two cooling fans are mounted on the right-hand side of the unit.
However, Comtech EF Data recommends that an alternate method of
IMPORTANT
Optional rear-mounting installation bracket
Install optional installation bracket (Figure 2-1) using mounting kit, KT/6228-2.
support within the rack be employed, such as rack shelves. If there is any
doubt, please consult the Comtech EF Data Customer Support department.
Optional: Mounting Kit , KT/6228-2
Quantity Part Number Description
2
4 HW/10-32x1/2RK Bolt, #10 Rack
2 HW/10-32HEXNUT Nut, #10 Hex
2 HW/10-32FLT Washer, #10 Flat
2 HW/10-32X1/4 SHC Screw, Socket 10-32 x 1/4inch
FP/6138-1 Bracket, Rear Support
The tools required for this installation are a medium Phillips screwdriver, and a
5/32-inch SAE Allen Wrench.
Refer to the following Figure, then install the Modem rear support brackets as follows:
a) Install the rear support brackets onto the mounting rail of the rack. Fasten with the
bracket bolts.
b) Mount the modem into the equipment rack ensuring that the socket heads engage into
the modem slots of the rear support brackets.
c) Fasten the provided #10 socket head screws to the rear-side mounting slots on either
side of the chassis modem and secure with #10 flat washers and #10 hex nuts.
There are no internal jumpers to configure, no interface cards to install, and no other
options to install. All configurations are carried out entirely in software. The unit should
first be configured locally, using the front panel keypad and display. The unit will ship
with a default 64 kbps, QPSK, Rate 1/2 configuration. Please refer to the ‘FRONT
PANEL OPERATION’ section for details on how to fully configure the unit for the
desired operating parameters.
Note: The auto-sensing AC power supply does not require any adjustments. Simply plug
in the supplied line cord, and turn on the switch on the rear panel.
2.4 Select Internal IF Loop
Correct operation of the unit may be verified rapidly, without the need for externally
connected equipment. From the top level menu, select TEST, then IF LOOP (refer to the
‘FRONT PANEL OPERATION’ section). The demod should synchronize, and the green
RECEIVE TRAFFIC LED should illuminate. If the unit does not pass this test, call
Comtech EF Data Customer Support department for assistance.
2.5 Connect External Cables
Having verified correct operation in IF loop, enter the desired configuration, and proceed
to connect all external cables. If difficulties occur, please call the factory for assistance.
Note: That the modulator gives an output power level in the range 0 to -20 dBm, and the
demodulator expects to see a signal in the range -30 to -60 dBm.
2–4
Page 47
Chapter 3. FUNCTIONAL
DESCRIPTION
The CDM-600 has two fundamentally different types of interface - IF and data.
• The data interface is a bi-directional path which connects with the customer’s
equipment (assumed to be the DTE) and the modem (assumed to be the DCE).
• The IF interface provides a bi-directional link with the satellite via the uplink and
downlink equipment.
Transmit data is received by the terrestrial interface where line receivers convert the
clock and data signals to CMOS levels for further processing. A small FIFO follows the
terrestrial interface to facilitate the various clocking and framing options. If framing is
enabled, the transmit clock and data output from the FIFO pass through the framer, where
the overhead data (IDR, IBS, D&I or EDMAC) is added to the main data. Otherwise, the
clock and data are passed directly to the Forward Error Correction encoder. In the FEC
encoder, the data is differentially encoded, scrambled, and then convolutionally encoded.
Following the encoder, the data is fed to the transmit digital filters, which perform
spectral shaping on the data signals. The resultant I and Q signals are then fed to the
BPSK, QPSK/OQPSK, 8-PSK, 8-QAM, or 16-QAM modulator. The carrier is generated
by a frequency synthesizer, and the I and Q signals directly modulate this carrier to
produce an IF output signal.
The RX-IF signal is translated directly to baseband, using the carrier recovery VCO. This
is a complex mix, resulting in the signal once more being split into an in-phase (I) and a
quadrature (Q) component. An AGC circuit maintains the desired signal level constant
over a broad range. Following this, the I and Q signals are sampled by high-speed (flash)
A/D converters. All processing beyond this conversion is purely digital, comprising a
Costas loop, that performs the functions of Nyquist filtering, carrier recovery, and symbol
timing recovery. The resultant demodulated signal is fed, in soft decision form, to the
selected FEC decoder (which can be Viterbi, Sequential, TCM, Reed-Solomon, Turbo,
LDPC if installed). After decoding, the recovered clock and data pass to the de-framer (if
IBS, IDR, D&I or EDMAC framing is enabled) where the overhead information is
removed. Following this, the data passes to the Plesiochronous/Doppler buffer, which has
a programmable size, or may be bypassed. From here, the receive clock and data signals
are routed to the terrestrial interface, and are passed to the externally connected DTE
equipment.
Physically the CDM-600 modem is comprised of two main card assemblies.
• The first of these is the baseband framer card, which includes all of the interface
circuits, the framer/de-framer, plesiochronous/Doppler buffer, Reed Solomon
outer codec, and the main microcontroller.
• The second card is the modem itself, that performs all of signal processing
functions of modulation, demodulation, and Forward Error Correction.
These functions are shown in Figure 3-1.
TX G703 T1/E1
DEFRAMER AND
INTERFACE
(U46)
TX AUDIO INTERFACE
(U43 & U50)
RS-422, V.35 OR
RS-232
INTERFACE
(U63 & U67)
LVD S
INTERFACE
(U62 & U64)
G703 T2/E2
INTERFACE
(U74)
OVERHEAD
INTERFACES
(U55, 57, 59, 68, & 75)
RX AUDIO INTERFACE
(U60 & U61)
RX G703 T1/E1
DEFRAMER AND
INTERFACE
(U51)
INT CLK
DDS (U33)
TX LINE
DECODING
RX LINE
ENCODING
INSERT
INS CLK
DDS (U42)
BUFFER
BUFFER CLK
DDS (U41)
MUX (U22)
TX FRAMING
(IBS, IDR, D&I
OR EDMAC)
IBS OR
EDMAC
SCRAM-
BLER
MICROPROCESSOR (U44)
& PROCESSOR FPGA (U49)
RX DE-FRA MING
(IBS, IDR, D&I OR
EDMAC)
IBS OR EDMAC
DESCRAMBLER
DEMUX (U19)
AS/0423
BASEBAND
FRAMING
CARD
TX REED-
SOLOMON
WITH
SCRAMB-
LER
(U12)
ENC CLK
DDS (U24)
INS CLK
DDS (U42)
RX REED-
SOLOMON
WITH DESCRAMB-
LER
(U20)
AS/0424
MODEM
CARD
VIT/SEQ/OM73
DESCRAMBLERS
DLF/NCO (U47)
SEQ
ENCODER
VITERBI
& TCM
CODEC
(U48)
TURBO CODEC
W/ SCRAMBLER
& DESCRAMBLE R
LDPC CARD
(OPTIONAL CARD)
SEQ
DEC-
ODER
VIT/SEQ/OM73
SCRAMBLERS
I & Q FILTERS
RECOVERY (U45 )
SYM & BIT
TIMING
RECOVERY
BIT/SYM
DACS (U49)
TXFIR (U61)
TX IF
RX IF
FIR/PD & I/Q
CARRIER
DACS
(U52)
Figure 3-1. CDM-600 Modem Block Diagram
3–2
Page 49
Chapter 4. PHYSICAL
4.1 Introduction
The CDM-600 is constructed as a 1U high rack-mount chassis, which can be freestanding. Rack handles at the front ease removal from and placement into a rack. Figure
4-1 shows the front panel of the modem.
Figure 4-1. Front Panel
DESCRIPTION
4.2 Front Panel
The front panel contains the Vacuum Fluorescent Display (VFD), keypad, and eight LED
indicators. The user enters data via the keypad, and messages are displayed on the VFD.
The LEDs indicate, in a summary fashion, the status of the unit.
The VFD is an active display showing 2 lines of 40 characters each. It produces a blue
light with adjustable brightness. Viewing characteristics are superior to a Liquid Crystal
Display (LCD), and do not suffer problems of viewing angle or contrast.
The keypad comprises six individual keyswitches, mounted directly behind a fully sealed
membrane overlay. They have a positive ‘click’ action, which provides tactile feedback.
These six switches are identified as [↑], [↓], [→], [←] arrows, ENTER and CLEAR. The
functions of these keys are described in the ‘Front Panel Operation’ section.
There are 8 LEDs on the front panel. The behavior of these LEDs is also described in the
‘Front Panel Operation’ section.
External cables are attached to connectors on the rear panel of the CDM-600. These
comprise:
Name Ref Des Connector Type Function
Rx IF J1 BNC RF Input
Tx IF J2 BNC RF Output
Aux Serial P6 He1402 3 pin header Auxiliary Serial
Overhead P3A 25-pin D (male) Overhead Data
Data Interface P3B 25-pin D (female) Data Input/Output
External Reference J9 BNC Input
Audio P4A 9-pin D (female) Sound Input
Remote Control P4B 9-pin D (male) Remote Interface
IDR Alarm P5A 15-pin D (female) Alarm
Alarms P5B 15-pin D (male) FORM C Alarm
Balanced G.703 P7 15-pin D (female) Balanced G.703 Data
IDI J10A BNC Insert Data In
DDO J11A BNC Drop Data Output
Rx Unbalanced J10B BNC Receive G.703
Tx Unbalanced J11B BNC Transmit G.703
External Frequency Ref J12 SMA External IF reference
Input (Optional)
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.
4.3.1 IEC Line Input Connector
The IEC line input connector contains the ON/OFF switch for the unit. It is also fitted
with two fuses - one each for line and neutral connections (or L1, L2, where appropriate).
These are contained within the body of the connector, behind a small plastic flap.
• For 230 volt AC operation, use T0.75A, (slow-blow) 20mm fuses.
• For 115 volt AC operation, use T1.25A, (slow-blow) 20mm fuses.
For continued operator safety, always replace the fuses with the correct
The IF port connectors are both a 50Ω BNC female type. 75Ω cable connectors (male)
will have no problem mating with this 50Ω type. The electrical impedance presented by
these connectors is controlled internally by an RF-switching arrangement. This selection
between 50Ω and 75Ω is controlled either via the front panel menus, or via the remote
control bus.
4.3.3 Overhead Data Connector (P3A)
The Overhead data connector is a 25-pin ‘D’ type male (DB25-M). It is used for passing
components of INTELSAT specified overhead frame structures. These include 64 kbps
EIA-422 and 1/16 IBS overhead ESC at EIA-232. The IDR backward alarm inputs are
found on this connector.
4.3.4 Data Interface Connector (P3B)
The Data connector is a 25-pin ‘D’ type female (DB25-F). This connector conforms to
the EIA-530 pinout, which allows for connection of different electrical standards,
including EIA-422, V.35, and EIA232. A shielded 25-pin ‘D’ type provides a very solid
solution to EMC problems, unlike the sometimes used V.35 Winchester connector.
It is the responsibility of the user to provide the appropriate cables to
connect to this EIA-530 connector.
IMPORTANT
4.3.5 External Reference Connector (J9)
This is a BNC female connector. It is used for operating the buffer with an external
station reference. It requires an EIA-422 compatible level, so this unbalanced input
should have a zero volt offset and a swing of at least ± 2V into the 120 Ω termination
provided.
4.3.6 Audio Connector (P4A)
The Audio connector is a 9-pin ‘D’ type female (DB9-F). It is used for the two 32 kbps
ADPCM audio inputs and outputs (600 Ω transformer coupled, balanced signals). These
can be used for both ESC voice circuits in IDR mode, or as the primary data (FAST
option).
The Remote Control connector is a 9-pin ‘D’ type male (DB-9-M). Access is provide to
remote control ports of the modem, both EIA-232 and EIA-485.
4.3.8 IDR Alarm connector (P5A)
The Alarms connector is a 15-pin 'D' type female (DB15-F). Four Form C backward
alarm outputs specified by INTELSAT are found on this connector.
4.3.9 Form C Traffic Alarm Connector (P5B)
The Alarms connector is a 15-pin 'D' type male (DB15-M). This provides the user with
access to the Form-C relay contacts, which indicate the fault status of the unit. These are
typically connected to an external fault monitoring system, often found in satellite earth
stations. In addition, the receive I and Q demodulator samples are provided on this
connector. Connecting these signals to an oscilloscope in X, Y mode will provide the
receive signal constellation diagram, which is a useful diagnostic aid. A pin is also
provided which can mute the transmit carrier. This requires that the pin be shorted to
ground, or a TTL ‘low’, or an RS232 ‘high’ signal be applied. As an aid to antenna
pointing, or for driving step-track equipment, an analog AGC signal is provided on Pin 2
of this connector.
4.3.10 Auxiliary Serial Connector (P6)
This is an additional EIA-232 serial port, which is only used when the modem is part of a
1:1 pair. It uses a USB Type B connector.
Although this port uses a USB connector, the signals are not
USB compatible. Do NOT connect this port to the USB port of
WARN ING
a PC, or other computing device.
4.3.11 Balanced G.703 Interface Connector (P7)
A 15-pin 'D' type female (DB15-F) for balanced operation at the G.703 data rates of T1
(1.544 Mbps), E1 (2.048 Mbps) or T2 (6.312 Mbps).
Two additional female BNC 75Ω connectors for unbalanced operation at the G.703 data
rate of E1 (2.048 Mbps). These are the Insert Data In (IDI) and Drop Data Out (DDO)
port.
An alternative use for these ports is for sub-rate G.703 auxiliary operation on modems
with hardware revision 2.0 or higher. This permits operation at the additional rates of 512
and 1024 kbps. In this mode, IDI serves as the TX terrestrial input port, and DDO as the
output port.
4.3.13 Unbalanced G.703 Tx/Rx (J10B and J11B)
Two female BNC 75Ω connectors for unbalanced operation at the G.703 data rates of E1
(2.048 Mbps), T2 (6.312 Mbps), or E2 (8448 kbps).
4.3.14 External Frequency Reference Connector (J12)
connection of a high-stability external reference signal.
This is an SMA female connector. It is an optional connector used to permit the
The rear panel connectors (Figure 5-1) provide all necessary external connections
between the modem and other equipment.
Figure 5-1. Rear Panel
Table 5-1. External Connections
Name Ref Connector Type Function
RX IF J1 BNC RF Input
TX IF J2 BNC RF Output
Aux Serial P6 USB Type B (female) Auxiliary Serial
Overhead P3A 25-pin D (male) Overhead Data
Data Interface P3B 25-pin D (female) Data Input/Output
External Reference J9 BNC Input
Audio P4A 9-pin D (female) Audio Signal Input/Output
Remote Control P4B 9-pin D (male) Remote Interface
IDR Alarm P5A 15-pin D (female) Alarm
Alarms P5B 15-pin D (male) FORM C Alarms
Balanced G.703 P7 15-pin D (female) Balanced G.703 Data
IDI J10A BNC Insert Data In/Sub-rate Auxiliary Tx G.703 In
DDO J11A BNC Drop Data Output/ Sub-rate Auxiliary Rx G.703 Out
RX Unbalanced J10B BNC Receive G.703 (IDO)
TX Unbalanced J11B BNC Transmit G.703 (DDI)
External Frequency Reference J12 SMA High-Stability External Reference (Optional)
Note: To maintain compliance with the European EMC Directive (EN55022, EN50082-1) properly shielded cables are
The BNC connectors are located on the rear panel of the modem. Refer to Table 5-2 for
pin assignments.
Table 5-2. BNC Connectors
BNC Connector Reference Description Direction
RX-IF J1 RX-IF signals In
TX-IF J2 TX-IF signals Out
EXT REF J9 External Baseband Input In
IDI J10A Insert Data Input In
DDO J11A Drop Data Output Out
RX (IDO) J10B RX G.703 (Unbalanced) Out
TX (IDI) J11B TX G.703 (Unbalanced) In
5.3 Overhead Interface Connector (P3A)
The overhead interface connector is a 25-pin male D interface located on the rear panel of the
modem. Refer to Table 5-3 for pin assignments.
The Data Interface connector, a 25-pin D type female, conducts data input and output
signals to and from the modem, and connects to customer’s terrestrial equipment,
breakout panel, or protection switch. Refer to Table 5-4 for pin assignments.
Table 5-4. Data Interface Connector Pin Assignments
Pin #
2 Transmit Data A DTE to Modem SD A SD A BA 103
14 Transmit Data B DTE to Modem SD B SD B - 103
24 Transmit Clock A DTE to Modem TT A SCTE A DA 113
11 Transmit Clock B DTE to Modem TT B SCTE B - 113
15 Internal Transmit
12 Internal Transmit
3 Receive Data A Modem to DTE RD A RD A BB 104
16 Receive Data B Modem to DTE RD B RD B - 104
17 Receive Clock A Modem to DTE RT A SCR A DD 115
9 Receive Clock B Modem to DTE RT B SCR B - 115
8 Receiver Ready A Modem to DTE RR A RLSD * CF 109
10 Receiver Ready B Modem to DTE RR B - - 109
23 External Carrier Off
7 Signal Ground - SG SG AB 102
Generic Signal
description
Clock A
Clock B
(EIA-232 ‘1' or TTL
‘low’ )
Direction
Modem to DTE ST A SCT A DB 114
Modem to DTE ST B SCT B - 114
DTE to Modem - - - -
EIA-422
EIA 530
LVDS
V.35 EIA-232 Circuit #
1 Shield - Shield FG AN 101
Notes:
1. Receiver Ready is an EIA-232 -level control signal on a V.35 interface.
2. DO NOT connect signals to pins which are not shown - these pins are reserved for use by the redundancy
system.
3. ‘B’ signal lines are not used for EIA-232 applications.
4. For X.21 operation, use the EIA-422 pins, but ignore Receive Clock if the Modem is DTE, and ignore
Transmit clocks if the Modem is DCE.
5. For IDR operation using G.703, this primary interface becomes the 8 kbps EIA-422 overhead channel.
Pin # Signal Function Direction
1 Tx Audio 1 + In
6 Tx Audio 1 - In
2 Rx Audio 1 + Out
7 Rx Audio 1 - Out
8 Tx Audio 2 + In
4 Tx Audio 2 - In
9 Rx Audio 2 + Out
5 Rx Audio 2 - Out
3 Common
5.6 Remote Control Interface Connector (P4B)
The remote control interface connection is a 9-pin male connector located on the rear
panel of the modem. Refer to Table 5-6 for pin assignments.The remote control port is
intended for connection to an M&C computer, or terminal device. This interface is user
selectable for either EIA-232 or EIA-485.
Table 5-6. Remote Control Interface Connector Pin Assignments
Pin #
1 Ground
2 EIA-232 Transmit Data Out
3 EIA-232 Receive Data In
4 Reserved - do not connect to this pin
5 Ground
6 EIA-485 Receive Data B * In
7 EIA-485 Receive Data A * In
8 EIA-485 Transmit Data B Out
9 EIA-485 Transmit Data A Out
1* Drop Data Input ( - ) DDI– In
9* Drop Data Input (+) DDI+ In
2 Ground GND
10 Not Used
3* Insert Data Output ( - ) IDO– Out
11* Insert Data Output (+) IDO+ Out
4 Ground GND
12 Drop Data Output ( - ) DDO– Out
5 Drop Data Output (+) DDO+ Out
13 Insert Data Input ( - ) IDI– In
6 Insert Data Input (+) IDI+ In
14 Not Used
7 Not Used
15 Not Used
8 Not Used
* Use for all non-Drop and Insert and T2/E2 balanced applications.
The user can fully control and monitor the operation of the CDM-600 from the front
panel, using the keypad and display. Nested menus are used, which display all available
options, and prompt the user to carry out a required action.
The display has two lines each of 40 characters. On most menu screens, the user will
observe a flashing solid block cursor, which blinks at a once-per-second rate. This
indicates the currently selected item, digit, or field. Where this solid block cursor would
obscure the item being edited (for example, a numeric field) the cursor will automatically
change to an underline cursor.
If the user were to display the same screen for weeks at a time, the display could become
‘burnt’ with this image. To prevent this, the unit has a ‘screen saver’ feature that will
activate after 1 hour. The top line of the display will show the Circuit ID (which can be
entered by the user) and the bottom line will show the circuit Eb/No value (if the demod
is locked) followed by ‘Press any key....’. The message moves from right to left across
the screen, then wraps around. Pressing any key will restore the previous screen.
OPERATION
Figure 6-1. Front Panel View
6–1
Page 64
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
The behavior of the front panel LEDs is described below in Table 6-1.
Table 6-1. Front Panel LED Indicators
LED Color Condition
Unit
Status
Traffic
Traffic
On line
Stored Event
Remote
EDMAC Mode
Test Mode
Red A Unit Fault exists (Example: PSU fault)
Orange No Unit Faults, but a Traffic Fault exists
Green No Unit Faults, or Traffic Faults
Green No Tx Traffic Faults Transmit
Off A Tx Traffic fault exists OR the Tx Carrier is in OFF state
Green No Rx Traffic Faults (demod and Viterbi decoder are locked, everything is OK) Receive
Off An Rx Traffic fault exists (the demod may still be OK)
Green The Unit is On Line, and carrying traffic
Off
Orange
Off There are no Stored Events
Orange The Unit is in Remote Mode - local monitoring is possible, but no local control
Off The Unit is in Local Mode - remote monitoring is possible, but no remote control
Flashing
Orange
Off Either no EDMAC, EDMAC Master, or Transparent mode is selected
Orange A Test Mode is selected (Example: IF Loopback)
Off There is no Test Mode currently selected
The Unit is Off Line (standby) - forced by externally connected 1:1 or 1:N
redundancy system
There is a Stored Event in the log, which can be viewed from the front panel, or
retrieved via the remote control interface
ODU control has been enabled, and there is a communications fault, or there is a
ODU status fault
Framing on, EDMAC on, and unit defined as Slave - local monitoring is possible,
but no local control
IMPORTANT
In general, the Alarm relay state will reflect the state of the Front Panel LEDs. For
instance, if the Unit Status LED is red, the Unit Alarm relay will be active, etc. The
one exception is the Transmit Traffic relay. This will only be activated if a Transmit
Traffic Fault exists – it does not reflect the state of the TX carrier.
6–2
Page 65
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
The keypad is shown in Figure 6-2:
Figure 6-2. Keypad
The function of these keys is as follows:
ENTER
CLEAR
Left, Right
[←], [→]
Up, Down
[↑], [↓]
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 arrows are used to move to the next selection or to move the cursor functions. At times,
they may also used to move from one section to another.
These arrows are used primarily to change configuration data (numbers). At times, they may
also be used to move from one section to another.
The keypad has an auto-repeat feature. If a key is held down for more than 1 second,
the key action will repeat, automatically, at the rate of 15 keystrokes per second.
This is particularly useful when editing numeric fields, with many digits, such as
IMPORTANT
frequency or data rate.
6–3
Page 66
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
SELECT
CONFIGURE
TEST
INFORMATION
MONITOR
STORE/LOAD
UTILITY
ODU
FAST
CONFIGURE
CONFIGURE ALL
CONFIGURE MODE
CONFIGURE TRANSMIT
CONFIGURE RECEIVE
CONFIGURE CLOCKS
DROP AND INSERT
EDMAC
MISC
REMOTE
MASKS
IMPEDANCE
STATISTICS
TEST
NORMAL
TRANSMIT CW
TRANSMIT ALT 1,0
IF LOOPBACK
DIGITAL LOOPBACK
I/O LOOPBACK
RF LOOPBACK
INFORMATION
ALL
CIRCUIT ID
FORMAT
TRANSMIT
RECEIVE
CLOCKS
EDMAC
DROP
INSERT
REMOTE
ALARM MASK
MISCELLANEOUS
MONITOR
LIVE ALARMS
STORED EVENTS
STATISTICS
AUPC PARAMS
RX PARAMETERS
STORE/LOAD
STORE
LOAD
UTILITY
REAL-TIME CLOCK
BRIGHTNESS
LAMP TEST
MANUAL 1:1 SWITCH
EDIT CIRCUIT ID
ODU
(SEE SEPARATE
USER'S GUIDE)
FAST
VIEW/UPGRADE
OPTIONS
CONFIGURE ALL
(COMPLETE CONFIGURATION)
CONFIGURE MODE
TX MODE AND INTERFACE
RX MODE AND INTERFACE
CONFIGURE TRANSMIT
TRANSMIT IF
POWER
ENCODER
MODULATION
DATA
SCRAMBLER
CONFIGURE RECEIVE
RECEIVE IF
DECODER
DEMOD
DATA
DESCRAMBLER
Eb/No ALARM THRESHOLD
Permits the user to completely configure the unit, being prompted, step
by step, to make choices, or edit data. This is highly recommended for
new users, as it will clearly lead the user through all the configuration
parameters.
Permits the user to select Frame Type and Data Format for TX and RX.
Permits the user to define, on a parameter-by-parameter basis, the TX
configuration of the unit. These menu sub-branches would be used if the
user wished to change, for example, just the TX Frequency.
Permits the user to define, on a parameter-by-parameter basis, the RX
configuration of the unit. These menu sub-branches would be used if the
user wished to change, for example, just the RX data rate.
Permits the user to select TX-Clocking, RX-Buffer/Clock, or External
Reference.
Permits the user to select Drop or Insert options.
Permits the user to select EDMAC options.
Permits the user to select, view, or change various other parameters.
Permits the user to define whether the unit is being controlled locally, or
remotely, and to configure the Remote Control parameters: baud rate,
I/O format, address.
Permits the user to activate or MASK an alarm condition.
Permits the user to select the impedance at the IF connectors,
either 50 or 75 Ω.
Permits the user to enable and configure the logging of various statistics,
including Eb/No and AUPC parameters
The modem may be monitored over the remote control bus at any
time. When in Local mode, however, configuration parameters may
only be changed through the front panel. Conversely, when in
Remote mode, the unit may be monitored from the front panel, but
IMPORTANT
configuration parameters may only be changed via the remote
control bus.
6–6
Page 69
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
6.3.1.1 CONFIG: ALL
ALL = START
(STOP, START)
This menu permits the user to configure the unit, in a step-by-step process by viewing
each menu in succession. Use the [←] [→] [↑] and [↓] arrow keys to select and edit the
various parameters. Press ENTER to continue through all the configuration. Press
CLEAR to discontinue.
6.3.1.2 CONFIG: MODE
The MODE is a key parameter when configuring the modem. To simplify the menu
choices, the user must first determine the INTERFACE and FRAMING type for both
IMPORTANT
Transmit and Receive. Once these have been selected, the user is only presented
with menu choices that are applicable to those particular modes.
Examples:
• If a G.703 interface is selected, the data rate menu will be restricted to only
the appropriate G.703 rates.
• If an IDR framing mode is selected, the data rate choices will be limited to
TX-IF: POWER ENCODER MOD DATA SCRAMBLER
DATA=20000.000kbps SYMBOL=10000.000ksym
Select the parameters on the top line to be edited using the [←] [→] arrow keys. Observe
the Data/Symbol rates on the bottom line. Press ENTER
CONFIG: TX: TX-IF
TX-IF: CARRIER = ON (ON,OFF,RTI)
TX FREQ=176.0000MHz SPECTRUM
Three TX settings can be set from this menu. Select the parameter to edit using the [←]
[→] arrow keys. The options for the TX carrier are shown in parentheses. To change the
settings use the [↑] [↓] arrow keys. Select either ON, OFF, or RTI, then press ENTER.
IMPORTANT
RTI means RECEIVE/TRANSMIT INHIBIT. When selected, it will prevent
the TX carrier from being transmitted, until the demodulator is locked. To
avoid the Tx Carrier from being turned off when the demodulator loses lock
for a very short period of time, the demodulator must be unlocked
continuously for a period of 10 seconds before the transmit carrier is inhibited.
This time interval is fixed and the user cannot change it.
Having this feature enabled does not affect the internal IF loopback feature.
But, be aware that if an external IF loopback is attempted (connecting an
external cable from the Tx IF output to the Rx IF input), then this will not
work! (The Tx carrier cannot turn on until the demod is locked, and the
demod cannot lock, because the TX output is off. The net result is that the
demod will not lock, and the Tx carrier will not turn on. USE THE RTI
FEATURE WITH EXTREME CARE!
6–8
Page 71
CDM-600 Satellite Modem Revision 7
N
Front Panel Operation MN/CDM600.IOM
Select each digit of the TX frequency to be edited using the [←] [→] arrow keys. Edit the
value of the digit using the [↑] [↓] arrow keys. When editing is complete, press ENTER.
Note that the range is from 52 to 88 MHz, and 104 to 176 MHz. The resolution is 100Hz.
For units manufacured after February 2005, and which display CDM-600(E) on the
opening menu, the range of IF frequencies has been extended to 50 - 90 MHz, and 100 180 MHz.
SPECTRUM INVERT should normally be in the OFF position. When in
the ON position, for all FEC types, except BPSK, the transmit spectrum
IMPORTANT
is inverted (which is the same as reversing the direction of phase rotation
in the modulator). In BPSK, the time-order of bits out of the FEC
encoder is reversed, to make the modem compatible with certain other
manufacturer’s modems.
Select the parameter to edit using the [←] [→] arrow keys. Edit the output level mode,
either MANUAL or AUPC, using the [↑] [↓] arrow keys. Select each digit of the TX
Power Level using the [←] [→] arrow keys. Edit the value of the digit using the [↑] [↓]
arrow keys. When editing is complete, press ENTER.
If AUPC mode is selected, the lower line changes:
(Note that EDMAC, or D&I++, or ESC++ framing must be enabled for AUPC to
function.)
Use the [←] [→] arrow keys to select either TARGET-EbNo/RANGE or ALARM
ACTION, then press ENTER
If TARGET-EbNo/RANGE is selected, the following menu will be displayed:
MINIMUM EbNo OF REMOTE MODEM = 5.0dB
MAXIMUM PERMITTED POWER INCREASE = 9dB
Edit the target Eb/No of the remote modem. The default value is 3.0 dB, and upper limit
is 9.9 dB. Edit the maximum permitted increase in power level when in AUPC mode.
The default value is 1dB, and upper limit is 9 dB. The user should then press ENTER.
6–9
Page 72
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
If ALARM ACTION is selected, the following menu will be displayed:
MAX TX PWR ACTION = NONE (NONE, TX-ALM)
REM DEMOD UNLOCK ACT = NOM-PWR(NOM, MAX)
Select the action that will occur if the AUPC causes the maximum output power level to
be reached, either NONE or TX ALARM.
Select the action that will occur if the remote demod is unlocked. The choices are: NOM-PWR (Nominal Power), where the output level will revert to the nominal power level set
under MANUAL or MAX-PWR, (Maximum Power), where the output level will change
to the maximum permitted. The user should then press ENTER.
CONFIG: TX: ENCODER
ENCODER = TPC (NONE,VIT,SEQ,TCM,TPC,LDPC)
REED-SOLOMON= OFF (ON,OFF)
Select the parameter to edit using the [←] [→] arrow keys.
The Encoder options are shown in the parentheses. Select using the [↑] [↓] arrow keys,
• LDPC (Hardware option) Note: This option of encoding is only displayed if
the TPC/LDPC Codec is installed.
Select ON or OFF for Reed-Solomon using the [↑] [↓] arrow keys, then press ENTER. If
Reed-Solomon is ON, proceed to the next menu.
If None is selected, the bottom line of the display will change from the R-S selection to
the Differential Encoding selection, as shown below:
ENCODER = NONE (NONE,VIT,SEQ,TCM,TPC,LDPC)
DIFF-ENCODER= OFF (ON, OFF)
If the user selects Differential Encoding=OFF, there is no way for the
modem to resolve the phase ambiguities associated with PSK
IMPORTANT
modulations. For BPSK there is a 1 in 2 chance that the polarity of the
data will be correct. IN QPSK there is a 1 in 4 chance the data will be
correct.
6–10
Page 73
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
CONFIG: TX: ENCODER: REED-SOLOMON ON
REED-SOLOMON ENCODING = ON(200/180)
Use the [↑] [↓] arrow keys to select one of the listed parameters, and press ENTER.
Selections depend on the Framing mode. Possible selections include:
• IESS-310 (219/201), open or closed network
• IBS (126/112), open or closed network
• EDMAC (200/180), closed network
• IDR (225/205), open network
• IDR (194/178), open network
• UNFRAMED (220/200), closed network
• LEGACY EF DATA (225, 205 with V.356 scrambling), closed network
6–11
Page 74
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
CONFIG: TX: DATA
TX DATA RATE = 01544.000 kbps
DATA INVERT = OFF (ON,OFF)
The top line permits the data rate to be edited. Select the digit of Transmit Data Rate to
be edited using the [←] [→] arrow keys. The value of the digit is changed using the [↑]
[↓] arrow keys. Press ENTER.
NOTE: The minimum and maximum data rates are dependent on Modulation type and
FEC encoder Rate. If the user changes the Modulation or FEC, and the data rate becomes
invalid, the Data Rate will be adjusted automatically. The upper range of data rate will
be dictated by the FAST option installed.
When Drop Framing or the G.703 interface type is used the [↑] [↓] arrow keys will scroll
through the available data rates. If in Drop Mode and the data rate is edited to 1920 kbps,
a comment is shown to indicate that E1 fixed channel mode will be implemented.
When G.703 is used and the Modem is Hardware Revision 2.0 or higher, three auxiliary
rates will also be available (512, 1024 and 2048 kbps) indicated by the word AUX
appearing to the right of the decimal place. (For example, 00512.AUX kbps). Refer to
Section 4.3 IDI/DDO connectors for information on how to connect the cables for the
AUX data rates.
The bottom line permits the user to select the data inversion feature (added for
compatibility with certain older equipment). Select either ON or OFF, using the [↑] [↓]
arrow keys, then press ENTER.
CONFIG: TX: SCRAMBLER
6–13
TX SCRAMBLER = ON (ON,OFF)
FRAME SCRAMBLER
Select either ON or OFF, using the [↑] [↓] arrow keys, then press ENTER.
The choice of scrambler is selected automatically, and will be depend on the exact
operating mode. For example, if no framing is being used, the ITU V.35 scrambler
(Intelsat variant) will be used. If IBS framing is selected, the IESS-309 scrambler will be
used, etc. If Turbo encoding is used a second scrambler selection is available: IESS-315
V.35 instead of the TPC scrambler.
Edit the Acquisition Sweep Range of the demodulator. The value of the digit is changed
using the [↑] [↓] arrow keys. Press ENTER.
The value entered determines the amount of frequency uncertainty the demodulator will
sweep over in order to find and lock to an incoming carrier. When operating at low bit
rates, large values of sweep range (compared to the data rate) will cause excessively long
acquisition times. For example: selecting ± 32 kHz with a data rate of 2.4 kbps, BPSK,
will result in an average acquisition time of around 3 minutes.
Edit the Receive Frequency (RX FREQ) of the demodulator. Select the digit to be edited
using the [←] [→] arrow keys. The value of the digit is changed using the [↑] [↓] arrow
keys. Press ENTER. Note that the range is from 52 to 88 MHz, and 104 to 176 MHz. The
resolution is 100Hz.
For units manufacured after February 2005, and which display CDM-600(E)on the
opening menu, the range of IF frequencies has been extended to 50 - 90 MHz, and 100 180 MHz.
SPECTRUM INVERT should normally be in the OFF position. When in
the ON position, the receive spectrum is inverted (which is the same as
IMPORTANT
reversing the direction of phase rotation in the demodulator). Note that in
BPSK mode, the demodulator will automatically synchronize to either the
normal time-ordering of bits FEC codeword pairs, or the inverted ordering
used by certain other manufacturers.
6–14
Page 77
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
CONFIG: RX: DECODER
DECODER = VIT NONE,VIT,SEQ,TCM,TPC,LDPC)
REED-SOLOMON = OFF (ON,OFF)
Select the parameter to edit using the [←] [→] arrow keys.
The Decoder options are shown in the parentheses. Select using the [↑] [↓] arrow keys,
then press ENTER. The choices are:
• LDPC (Hardware option) Note: This option of decoding is only displayed if
the TPC/LDPC Codec is installed.
Select ON or OFF for Reed-Solomon using the [↑] [↓] arrow keys, then press ENTER. If
Reed-Solomon is ON, proceed to the next menu.
If NONE is selected, the bottom line of the display will change from the RS selection to
the Differential Encoding selection, as shown below:
DECODER = NONE (NONE,VIT,SEQ,TCM,TPC,LDPC)
DIFF-DECODER= OFF (ON,OFF)
If the user selects Differential Decoding = OFF, there is no way for the
modem to resolve the phase ambiguities associated with PSK
IMPORTANT
modulations. For BPSK there is a 1 in 2 chance that the polarity of the
data will be correct. In QPSK there is a 1 in 4 chance that the data will
be correct.
6–15
Page 78
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
CONFIG: RX: DECODER: REED-SOLOMON ON
REED-SOLOMON DECODING = ON(200/180)
Use the [↑] [↓] arrow keys to select one of the listed parameters, and press ENTER.
Selections depend on the Framing mode. Possible selections include:
• IESS-310 (219/201), open or closed network
• IBS (126/112), open or closed network
• EDMAC (200/180), closed network
• IDR (225/205), open network
• IDR (194/178), open network
• UNFRAMED (220/200), closed network
• LEGACY EF DATA (225,205, with V.35 scrambling), closed network
6–16
Page 79
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
RECEIVE DATA RATE = 00064.000 kbps
DATA INVERT = OFF (ON,OFF)
The top line permits the data rate to be edited Select the digit of the Receive Data Rate
using the [←] [→] arrow keys. Edit the value of the digit using the [↑] [↓] arrow keys.
Press ENTER.
6–17
Page 80
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
NOTE: The minimum and maximum data rates are dependent on Demodulation type and
FEC decoder Rate. If the user changes the Modulation or FEC, and the data rate becomes
invalid, the Data Rate will be adjusted automatically. The upper range of data rate will
be dictated by the FAST option installed.
When Insert Framing or the G.703 interface type is used the [↑] [↓]arrow keys will scroll
through the available data rates. If in Drop Mode and the data rate is edited to 1920 kbps,
a comment is shown to indicate that E1 fixed channel mode will be implemented. The
bottom line permits the user to select the data inversion feature (added for compatibility
with certain older equipment). Select either ON or OFF, using the [↑] [↓] arrow keys,
then press ENTER.
When G.703 is used and the Modem is Hardware Revision 2.0 or higher, three auxiliary
rates will also be available (512, 1024, and 2048 kbps) indicated by the word AUX
appearing to the right of the decimal place. (For example, 00512.AUX kbps).
Refer to Section 4.3 IDI/DDO connectors for additional information about how to
connect the cables for the new AUX data rates.
The bottom line permits the user to select the data inversion feature (added for
compatibility with certail older equipment). Select either ON or OFF, using the [↑ ] [↓]
arrow keys, then press ENTER.
CONFIG: RX: DESCRAMBLER
RX DESCRAMBLER = ON (ON,OFF)
FRAME DESCRAMBLER
Select either ON or OFF, using the [↑] [↓] arrow keys, then press ENTER.
The choice of descrambler is selected automatically, and will be depend on the exact
operating mode. For example, if no framing is being used, the ITU V.35 descrambler
(Intelsat variant) will be used. If IBS framing is selected, the IESS-309 descrambler will
be used.
If Turbo decoding is used a second scrambler selection is available: IESS-315 V.35
instead of the TPC scrambler.
If LDPC decoding is selected the standard ITU V.35 descrambler will be used.
6–18
Page 81
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
CONFIG: RX: EbNo
RECEIVE EbNo ALARM POINT = 02.0 dB
Select the digit of the Alarm point to be edited using the [←] [→] arrow keys. Edit the
value of the digit using the [↑] [↓] arrow keys. Press ENTER.
The range of values is from 00.1 to 16.0 dB. The user may select a value here, and if the
Eb/No falls below this value, a receive traffic fault will be generated.
Use the [↑] [↓] arrow keys to select from the choices shown in parentheses, then press
ENTER.
INTERNAL (SCT) Indicates that the unit will supply a clock to the DTE, which is derived from its
TX-TERRESTRIAL
(TT)
RX-LOOP Will allow the modem’s internal clock to be phase locked to the RX buffer clock
Example: The user has an available high stability 10 MHz clock source but the end
EXTERNAL CLOCK Indicates that an unbalanced high-stability source is expected at the J9 BNC
internal high-stability source. This is the required setting when the TX interface type
is Audio.
Indicates that the unit expects to receive a clock from the DTE, to which the unit
can phase-lock its internal circuits. If no clock is detected the modem will substitute
its internal clock and generate an alarm. This is the required setting when the
modem’s interface type is G.703.
source. This output clock is Send Timing. Choosing RX-LOOP will not automatically
select RX-SAT as the buffer clock source. This allows for increased flexibility for
modem clock selection. Normally the user will select RX-SAT but the other choices
also are available.
equipment will only accept a clock at the information data rate. Selecting TX Clock
= RX-LOOP and RX buffer clock as EXT-REF will provide receive timing and send
timing to the end equipment that is sourced from the 10 MHz reference.
connector, or a balanced version at the P3A connector. The frequency must match
that programmed in the CONFIG: CLOCKS, EXTERNAL-BASEBAND-CLOCK
menu, and must be equal to the TX data rate.
6–19
Page 82
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
CONFIG:CLOCKS: RX BUFFER/CLOCK
CLK= RX-SAT (RX-SAT,TX-TERR,EXT-CLK,INS)
BUFFER-SIZE = 00016bytes(00002ms) CENTER
Use the [←] [→] arrow keys to select one of the three parameters on the screen to edit.
Edit the RX clock options
RX-SAT
TX-TERR
EXT-CLK
INS
Sets the Receive buffer clock source to the satellite clock (The receive buffer will
be bypassed.) Note: This will fix the buffer size to minimum.
In this timing mode, data is clocked out of the receive buffer using the external
transmit clock.
In this timing mode, data is clocked out of the receive buffer using an External
clock.
Sets the buffer clock to the Insert stream (INSERT mode only).
Buffer-Size indicates the size, in bytes, of the Plesiochronous/Doppler Buffer. In
parentheses after this, the size in milliseconds is shown. Edit each digit of the buffer size
using the [↑] [↓] arrow keys. Press ENTER.
Note: When the RX data rate is set to one of the four G.703 rates, the minimum buffer
size and step size are limited to the value shown in the table below. In addition, Insert
Framing follows the same rule, regardless of n x 64 data rate, depending upon whether
the Insert Type is T1 or E1. If none of these cases is true, the minimum buffer size is
16 bytes with a step size of 2 bytes.
RX Data Rate Buffer Step Size
1544 kbps (T1) or open network D&I at T1 1158 bytes or 3 milliseconds for D4
2048 kbps (E1) or open network D&I at E1 1024 bytes or 4 milliseconds
D&I++ at n = 1, 3 or 5 720 bytes
D&I++ at n = 2, 6 10 or 15 1440 bytes
D&I++ at n = 9 2160 bytes
D&I++ at n = 4, 12 or 20 2880 bytes
D&I++ at n = 18 4320 bytes
D&I++ at n = 7 or 21 5040 bytes
D&I++ at n = 8 or 24 5760 bytes
D&I++ at n = 11 7920 bytes
D&I++ at n = 13 9360 bytes
D&I++ at n = 14 10080 bytes
D&I++ at n = 16 11520 bytes
D&I++ at n = 17 12240 bytes
D&I++ at n = 19 13680 bytes
D&I++ at n = 22 15840 bytes
D&I++ at n = 23 16560 bytes
6312 kbps (T2) 1578 bytes or 2 milliseconds
8448 kbps (E2) 528 bytes or 0.5 milliseconds
using the [↑] [↓] arrow keys, then press ENTER
(6 milliseconds for ESF)
6–20
Page 83
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
If CENTER is selected, the following sub-menu is displayed:
CONFIG: CLOCKS: RX BUFFER/CLOCK: CENTER
Follow the instructions on the screen.
PRESS ENTER TO CENTER THE BUFFER
OTHERWISE, PRESS CLEAR
CONFIG: CLOCKS: EXT-BASEBAND-CLOCK
EXTERNAL BASEBAND CLOCK = 02048.000 kHz
TYPE = UNBAL (UNBAL,BAL)
To edit the EXTERNAL BASEBAND CLOCK, select the digit to be edited using the
[←] [→] arrow keys. Edit the value of the digit using the [↑] [↓] arrow keys. Press
ENTER.
CONFIG: CLOCKS: EXT-FREQ-REF
EXTERNAL FREQUENCY REFERENCE: INTERNAL
(HIGH-STABILITY INTERNAL,1,2,5,10,20MHz)
For units with Firmware Version: 1.4.0 or greater, and with a High-Stability module
installed:
Edit the selection using the [↑] [↓] arrow keys. Press ENTER.
CONFIG: CLOCKS: INTERNAL REFERENCE
INTERNAL HI-STABILITY 10 MHz REFERENCE
FINE ADJUST: +048 (+/-999)
For units with Firmware Version: 1.4.0 or greater, with a High-Stability module installed,
and with the Hi-Stability Internal 10 MHz Reference selected:
Very fine adjustment of the Internal 10MHz Reference may be made. The adjustment
value is retained in EEPROM memory, and hence is not lost when the Nvram memory is
cleared (which happens on uploading new firmware). Note: changes made to the adjust
value are implemented immediately, not after the ENTER key is pressed.
Select the digit to be edited using the [←] [→] arrow keys. Edit the value of the digit
using the [↑] [↓] arrow keys. Press ENTER.
6–21
Page 84
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
6.3.1.6 CONFIG: DROP & INSERT
Drop and Insert is discussed in the Chapter “Clock modes and
Drop and Insert (D&I)” later in this manual.
sing the [←] [→] arrow keys, select one of the five parameters on the screen.
Note that Drop and Insert operation is a FAST option. Selecting LOOP will tie Drop
Data Out (DDO) to Insert Data Input (IDI) without the user having to externally
connect cables to these ports.
The Drop-Type and Insert-Type and Loop (Y/N) are edited on this screen using the [↑]
[↓] arrow keys. The Drop & Insert-Types are:
To edit the Channel Timeslots (CHAN/TS) for either Drop or Insert, press ENTER and
another screen will be shown:
• T1 – D4
• T1 – ESF
• E1 – CCS
• E1 – CAS
CONFIG: DROP & INSERT: DROP CHANNEL TIMESLOTS
DRP-CH: 1 2 3 4
TS: 01 02 03 04
Select the Time-slot to edit using the [←] [→]arrow keys and edit the value using the
[↓] [↑] arrow keys, then press ENTER.
The number of Channels and Time-slots shown depends on the data rate.
If the data rate is 1920 kbps, then only the E1 formats are available, and the CHAN/TS
menus are disabled. This is the ‘fixed channel’ mode where all timeslots are allocated in
order.
6–22
Page 85
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
CONFIG: DROP & INSERT: INSERT CHANNEL TIMESLOTS
INS-CH: 1 2 3 4
TS: 01 02 03 04
Select the Time-slot to edit using the [←] [→] arrow keys and edit the value using the [↑]
[↓]arrow keys, then press ENTER.
The number of Channels and Time-slots shown depends on the data rate.
If the data rate is 1920 kbps, then only the E1 formats are available, and the CHAN/TS
menus are disabled. This is the ‘fixed channel’ mode where all timeslots are allocated in
order.
Select the parameter to edit using the [←] [→] arrow keys, then press ENTER.
6–23
Page 86
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
CONFIG: MISC: G.703 CODE
Tx G703/DDO CODE = AMI (AMI,B8ZS)
Rx G703/IDI CODE = AMI (AMI,B8ZS)
Parameters may only be edited if the Interface Type is G.703.
Use the [←] [→] arrow keys to select the parameter to edit. Select either appropriate
G.703 code using the [↑] [↓] arrow keys, then press ENTER.
Note that the choices displayed here will depend on the G.703 interface type, which has
been selected. The choices are:
• HDB3 (for E1, E2 or sub-rate operation)
• B8ZS ( for T1 and unbalanced T2 operation)
• B6ZS (for balanced T2 operation)
CONFIG: MISC: IDR-ESC-TYPE
TX–IDR-TYPE: 64k DATA (64k DATA,AUDIO)
RX-IDR-TYPE: 64k DATA (64k DATA,AUDIO)
Parameters may onlybe edited if the Interface Type is G.703.
Parameters may only be edited if the Framing Mode is IDR.
This menu permits a user to decide if the 64 kbps channel in the IDR overhead (normally
reserved for the two 32 kbps ADPCM audio channels) should carry user data instead. The
rear panel Overhead connector provides the appropriate EIA-422 interface for this option.
Use the [←] [→] arrow keys to select the parameter to edit. Select the appropriate IDRESC Type, using the [↑] [↓] arrow keys, then press ENTER.
CONFIG: MISC: ADPCM AUDIO VOLUME
TX-1 VOLUME= +0 dB TX-2 VOLUME= -2 dB
RX-1 VOLUME= +2 dB RX-2 VOLUME= -4 dB
This menu permits the gain (or volume) of the audio ESC circuits, for both Receive and
Transmit, to be varied. Note that the step size is 2dB.
Select the appropriate volume, using the [←] [→] arrow keys, and edit the volume using
the [↑] [↓] arrow keys, and press ENTER.
6–24
Page 87
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
CONFIG: MISC: HIGH-RATE-ESC
HIGH-RATE-ESC = OFF (ON,OFF)
BAUDRATE = 9600 PARITY:DATA:STOP = N81
The ESC type defined here depends on the framing type selected under CONFIG,
MODE. The two options are either High-Rate IBS ESC, or ESC++
For units with Firmware Version: 1.3.1 or greater:
Service Channel) is available as a FAST option in conjunction with IBS framing. If
enabled, the lower of the TX or RX primary data rate, according to the table below, limits
the maximum baud rate. Both TX and RX framing must be IBS to enable this feature.
For units with Firmware Version: 2.0.1 or greater:
enabled, the lower of the TX or RX primary data rate, according to the table below, limits
the maximum baud rate. Both TX and RX framing must be set to ESC++. See Chapter 13
for more details on the framing used.
For units with Firmware Version: 1.4.0 or greater, and with a High-Stability module
installed: The High-Stability Reference Module contains an oven for the crystal. It can
take a little time for the oven & crystal to come up to temperature. During this time, the
frequency accuracy is not guaranteed. This menu allows the user to select a warm-up
delay, which will be implemented on power-up. The delay is calculated by the modem,
based on temperature and the amount of time the unit was turned off.
Page 88
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
If the Warm-up Delay is enabled, when the modem is powered up, a Warm-Up Delay
Countdown will be activated, during which the TX is suppressed. The Countdown of the
remaining Warm-up Delay is displayed on the front panel, for example:
Use the [←] [→] arrow keys to select the parameter to edit, then press ENTER.
One of the following sub-menus will be displayed:
CONFIG: MASK: AIS
AIS: TX-TERR-AIS= MASKED (ACTIVE,MASK)
RX-SAT-AIS = ACTIVE (ACTIVE,MASK)
Use the [←] [→] arrow keys to select the parameter to edit: Select either ACTIVE or
MASKED, using the [↑] [↓] arrow keys, then press ENTER.
If TX-TERR-AIS is set to ACTIVE, a fault will be generated whenever the
modulator senses that the ‘all ones’ condition is present in the terrestrial data.
If RX-SAT-AIS is set to ACTIVE, a fault will be generated whenever the
demodulator senses that the ‘all ones’ condition is present in the receive data.
If an alarm is MASKED, no alarm will be generated.
6–27
Page 90
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
CONFIG: MASK: BUFFER SLIP
BUFFER SLIP= ACTIVE (ACTIVE,MASK)
Select either ACTIVE or MASKED, using the [↑] [↓] arrow keys, then press ENTER.
• If the user selects ACTIVE, then a Buffer Slip fault will be generated whenever
the receive circuitry senses that the buffer has either underflowed, or overflowed.
• If the user selects MASKED, no alarm will be generated.
CONFIG: MASK: RX-IF
RXIF: AGC = ACTIVE (ACTIVE,MASK)
EbNo = MASKED (ACTIVE,MASK)
Use the [←] [→] arrow keys to select the parameter to edit: AGC or EbNo. Select either
ACTIVE or MASKED, using the [↑] [↓] arrow keys, then press ENTER.
If the user selects ACTIVE, then an AGC will be generated whenever the
receive signal level exceeds –20 dBm (for the desired carrier). An Eb/No fault
will be generated whenever the demodulator sees the receive Eb/No fall below
the pre-determined value.
If the user selects MASKED, no alarm will be generated.
CONFIG: MASK: SATELLITE ALARMS
Select either TX or RX, using the [←][→] arrow keys, then press ENTER.
SATELLITE ALARMS
TRANSMIT RECEIVE
CONFIG: MASK: SATELLITE ALARMS: TX
PROCESS ALARMS FROM (H/W, S/W, OFF)
BWA1=OFF BWA2=OFF BWA3=S/W BWA4=H/W
Select the Backward Alarm (BWA) to be edited using the [←][→] arrow keys. Edit the
settings using the [↑] [↓] arrow keys, then press ENTER. Select how the TX IDR
6–28
Page 91
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
backward alarm inputs are to be used. An activated alarm may respond to a hardware
input at P5A (H/W) or be software controlled by a receive fault on the modem (S/W).
CONFIG: MASK: SATELLITE ALARMS: RX
PROCESS ALARMS RECEIVED FROM SATELLITE
BWA1=N, BWA2=N, BWA3=N, BWA4=N
Select which Receive IDR backward alarms are to be monitored.
CONFIG: MASK: TERR-ALM
TERR-ALM: TX = ACTIVE (ACTIVE,MASK)
RX = OFF (OFF,ENABLED)
These alarms are only valid for D&I operation.
Use the [←] [→] arrow keys to select the parameter to edit. Edit the alarms using the [↑]
[↓] arrow keys, then press ENTER.
6.3.1.11 CONFIG: IMPEDANCE
IF IMPEDANCE = 50 (50,75 OHMS)
Select either 50 or 75Ω, using the [↑] [↓] arrow keys, then press ENTER.
Note that this affects both the Rx and Tx IF ports simultaneously.
6.3.1.12 CONFIG: STATISTICS
6–29
LINK STATISTICS LOGGING INTERVAL:
00 minutes (00 TO 90)
Edit the logging interval (the period of time over which the statistics will be measured),
using the [↑] [↓] arrow keys, then press ENTER. Setting a value of 00 disables the
feature (no logging).
The user can choose 00, 10, 20, 30, 40, 50, 60, 70, 80, or 90 minutes. For more
information about the Statistics data taken, refer to Section 6.3.4.3 Monitor: Statistics.
Page 92
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
6.3.2 TEST
MODEM TEST MODE = NORMAL
(NORM,TX-CW,TX-1/0,IF↓,RF↓,DIG↓,I/O↓)
Select TEST Mode or Normal Operation from the parameters shown in the parentheses
using the [↑] [↓] arrow keys, then press ENTER.
This sub-menu permits the user to select the following test modes:
NORM
TX-CW
TX-1,0
IF LOOP
DIG LOOP
I/O LOOP
RF LOOP
(Normal) This clears any test modes or loopbacks, and places the unit back
into an operational state.
(Transmit CW) This is a test mode, which forces the modulator to transmit a
pure carrier (unmodulated).
(Transmit an alternating 1,0,1,0 pattern) This is a test mode, which forces the
modulator to transmit a carrier modulated with an alternating 1,0,1,0 pattern, at
the currently selected symbol rate. This causes two discrete spectral lines to
appear, spaced at +/- half the symbol rate, about the carrier frequency. This
mode is used to check the carrier suppression of the Modulator.
(IF Loopback) This test mode invokes an internal IF loop. This is a particularly
useful feature, as it permits the user to perform a quick diagnostic test without
having to disturb external cabling. Furthermore, all of the receive configuration
parameters are temporarily changed to match those of the transmit side.
When NORMAL is again selected, all of the previous values are restored.
(Digital Loopback) This test mode invokes a digital loopback, which loops data
at the output of the Reed-Solomon encoder on the transmit side, back into the
Reed-Solomon decoder on the receive side. This tests all of the interface,
transmit baseband circuits, FEC encoder, FEC decoder, and buffer.
(Inward/Outward loopback) This test mode invokes two distinct loopbacks. The
first of these is the inward loop, which takes data being received from the
satellite direction, and passes it directly to the modulator. Simultaneously, the
outward loop is invoked, whereby data being fed to the transmit data interface
is routed directly back out of the receive data interface.
(RF Loopback) This test mode is almost identical to the IF loop mode. All of
the receive configuration parameters (except Rx Spectrum Invert) are
temporarily changed to match those of the transmit side, however, no internal
connection is made. This is useful for performing a satellite loopback. When
NORMAL is again selected, all of the previous values are restored.
The IF, Digital, and I/O Loopback modes are illustrated in Figure 6-1.
6–30
Page 93
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
Figure 6-4. Loopback Modes
6–31
Page 94
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
6.3.3 INFORMATION
INFO: ALL ID FORMAT TX RX CLOCKS EDMAC
DROP INSERT REMOTE ALARM-MASK MISC
Select information to view using the [←][→] arrow keys, then press ENTER.
Note: INFO screens display information on the current configuration of the modem
without risking inadvertent changes.
INFO:ALL
ALL = START
(STOP, START)
This menu permits the user to view the configuration of the unit, in a step-by-step process
by scrolling through each menu in succession. Press ENTER to continue through all the
configurations.
Note that the user may only view the configurations – no editing is possible.
Press CLEAR to discontinue.
INFO: ID
MODEM CIRCUIT ID:
----A TEST MESSAGE TO SHOW CIRCUIT ID---
This displays the user-defined Circuit ID string (40 characters), which is entered via the
UTILITY, ID screen. To return to the previous menu, press ENTER.
INFO: MODE
INFO: MODE: TX = G.703B: DROP (B8ZS)
RX = G.703B: INSERT (B8ZS)
An example of a Mode Information screen is shown above.
6–32
Page 95
CDM-600 Satellite Modem Revision 7
V
V
Front Panel Operation MN/CDM600.IOM
INFO: TX
TX:ON 070.00000MHz Z=50 PWR=-20.0 TSI=N
IT+RS:220/200 00604.000 QPSK 7/8 SCRM
A sample display of TX Info is shown. The information displayed here is as follows:
Top Line:
TX carrier
TX Frequency
Impedance
Power
TSI
Bottom line:
Encoder
Data Rate
Modulation
FEC rate
Scrambler
INFO: RX
RX:070.00000MHz Z=50 02.0dB +-30 RSI=N
IT+RS:126/112 00604.000 QPSK 1/2 SCRM
A sample display of RX Info is shown. The information displayed here is as follows:
Top line:
RX Frequency
Impedance
Eb/No
Sweep Range
RSI
Bottom line:
Decoder
Data Rate
Demodulation
FEC rate
Descrambler
XXXXX.XXX MHz
50 or 75 Ω
12 dB (Alarm Point)
up to ± 32 kHz
RSI = RX Spectral Inversion, I=Inverted (on), N=Not inverted (off)
FEC type: VITERBI, SEQ, TCM, VIT+RS, SEQ+RS, TCM+RS, TPC, LDPC
NONE: x (x = Differential Encoder setting, , shown as DE-OFF or DE-ON)
xxxxx.xxx kbps (an asterix * indicates that the data sense is inverted)
BPSK, QPSK, OQPSK, 8-PSK, 8-QAM, 16-QAM
1/2, 2/3, 3/4, 7/8, 0.95, 5/16, 21/44 or 1/1
SCRM, NONE, or IESS (Turbo Only)
ON, OFF, or RTI
xxxxx.xxx MHz
50 or 75 Ω
Power Level (dB)
TSI = TX Spectral Inversion, I=Inverted (on), N=Not inverted (off)
FEC type: VITERBI, SEQ, TCM, VIT+RS, SEQ+RS, TCM+RS, TPC, LDPC
NONE: x (x = Differential Encoder setting, shown as DE-OFF or DE-ON)
xxxxx.xxx kbps (an asterix * indicates that the data sense is inverted)
BPSK, QPSK, OQPSK, 8-PSK, 8-QAM, 16-QAM
1/2, 2/3, 3/4, 7/8, 0.95, 5/16, 21/44 or 1/1
SCRM, NONE, or IESS (Turbo Only)
The TX Clock, RX Clock and Buffer information is displayed.
Note: The Clock (CLK) information is shown only if Rx Clock is set to EXT-CLK.
INFO: EDMAC
EDMAC FUNCTION= O
EDMAC MODE= MASTER EDMAC ADDR= 0020
This screen shows if EDMAC is enabled or not. If it is enabled, the EDMAC Mode and
Address are shown.
INFO: DROP TYPE
DROP TYPE= CH:1
E1-CCS TS:01
This screen shows the Drop Type. Pressing ENTER takes the user back to the previous
menu.
INFO: INSERT TYPE
INSERT TYPE= CH:1
E1-CCS TS:01
This screen shows the Insert Type. Pressing ENTER takes the user back to the previous
menu.
6–34
Page 97
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
INFO: REMOTE
REMOTE-CONTROL= LOCAL ADDRESS= 0000
INTERFACE = RS-232 9600 BAUD N81
This screen shows if the unit is in Local or Remote mode, provides the details of the
electrical interface type selected, the unit’s address and the baud rate selected. Pressing
ENTER takes the user back to the previous menu.
INFO: ALARMS MASK
If an alarm is not masked, a blank is displayed in the relevant screen position.
ALARMS MASKED: TX-AIS RX-AIS BUF-SLIP
AGC EBNO SAT
This screen shows only the alarm(s) that are currently masked:
• TX-AIS
• RX-AIS
• BUF-SLIP
• AGC
• EBNO
• SAT
• TERR
INFO: MISC
MISCELLANEOUS: NORMAL
1:1 SWITCH = NOT CONNECTED ONLINE
This screen shows the following:
• Test Mode
• 1:1 Link Status
• Redundancy Status
6–35
Page 98
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
LIVE UNIT= NONE NET= NONE
ALARMS RECV=DEMOD LOCK XMT= NONE
An example of an Alarm screen is shown. The highest priority alarm currently active for
each of the four alarm types is shown:
Unit PSU: Power supplies (+5V, +12V, -5V, +18V, -12V) are always monitored by an
onboard supervisory IC.
TX and RX SYNTH: The PLLs in the IF sections are monitored for an unlocked
condition.
POWER CAL: Calibration data stored in EEPROM is checked at power up to verify
that the factory calibration has not been corrupted.
FPGA downloads (Main chain, Turbo FEC, Modem “Top” card, Mux and Demux) are
verified to have been loaded successfully.
Hi-Stab Freq Ref Module: No PLL Lock – This will suppress the TX carrier.
Transmit NO CLOCK: Clock activity from the Tx terrestrial source is checked, if expected. If
absent, the modem falls back to the internal SCT clock to drive the modulator.
FIFO SLIP: alarm occurs when the terrestrial clock source differs from the
programmed data rate, or may indicate a hardware failure.
TX AIS: Alarm Indication Signal (all 1’s) present at the Tx terrestrial input is
monitored.
AUPC LEVEL: If AUPC is enabled, a Tx alarm occurs if the power increase limit has
been reached.
Hi-Stab Freq Ref Module: Ref Activity Fault
Receive DEMOD LOCK: indicates either the demodulator or the following FEC decoder
cannot lock to the incoming signal.
AGC ALARM: is indicated if the demod signal level is >-20 or <-60 dBm.
FRAME SYNC: indicates that the de-framing unit (EDMAC, IBS or IDR) or Reed-
Solomon outer decoder cannot synchronize to the data being sent to it by the demod
and/or FEC decoder.
BUFF SLIP: occurs when Doppler or Plesiochronous effects cause the Rx data
buffer to empty or fill completely. The results in a reset to 50%.
RX AIS: Alarm Indication Signal (all 1’s) present at the Rx satellite input is monitored.
EbNo ALARM: occurs when the monitored level drops below that programmed by
the user in the CONFIG, RX, EbNo menu.
BUFF CLOCK: indicates that the desired buffer reference is not present, causing the
buffer to fall back on Rx satellite timing to clock its output.
arrow keys, then press ENTER.
6–36
Page 99
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
Unit
Network
LOSE TxFRM: Loss of Tx frame occurs in Drop & Insert operation,
when the incoming T1 or E1 frame cannot be found by the modem.
BER >10E-3: This error rate monitor is enabled for IBS and IDR
framing.
LOSE TxMUL: Loss of Tx multiframe occurs in E1-CAS D&I operation,
when the multiframe marker for CAS signaling data cannot be found.
Tx Sig AIS: An AIS condition in the signaling positions of an incoming
E1-CAS frame is monitored.
TX TERR RM indicates the presence of the Tx terrestrial remote alarm
on the incoming T1 or E1 frame.
IBS RX REM indicates the presence of the IBS satellite remote alarm
(backward alarm) on the incoming IBS frame from the transmit side of
the link.
IDR RX BW1-4: Multi-destinational backward alarms are the
corresponding satellite alarms used by the IDR frame structure.
IDR TX BW1-4: Backward alarms 1-4 indicate that the hardware inputs
available on the back panel of the modem have triggered, resulting in
the corresponding Tx backward alarm being generated by the modem’s
IDR framer.
An example of a Stored Events screen is shown. Use the [↑] [↓] arrow keys to select
Clear All: YES or NO,
Use the [←][→] arrow keys to select the ‘#’ character on the bottom line to view the log
entries. Scroll backwards or forwards through the entries in the event log, using the [↑]
[↓] arrow keys. Pressing ENTER or CLEAR will take the user back to the previous
menu. The event log can store up to 199 events. When a fault condition occurs, it is timestamped and put into the log. Similarly, when the fault condition clears, this is also
recorded.
If the user selects CLEAR ALL, the event log is cleared, and the user is taken directly
back to the previous menu. However, if there are faults present on the unit at this time,
they will be re-time-stamped, and new log entries will be generated.
Note that in accordance with international convention, the date is shown in DAYMONTH-YEAR format.
then press ENTER.
6–37
Page 100
CDM-600 Satellite Modem Revision 7
Front Panel Operation MN/CDM600.IOM
6.3.4.2 MONITOR: STATISTICS
STATISTICS: STA114: 16.0,16.0,9.0,9.0
09/12/99 14:48:06 CLEAR ALL: NO (N/Y)
The user may scroll backwards or forwards through the entries in the statistics log, using
the [↑] [↓] arrow keys. Pressing ENTER or CLEAR will take the user back to the
previous menu. The top line displays the log entry number and event log. The bottom line
of the display indicates the time and date of the entry shown in DAY-MONTH-YEAR
format. The display shows the statistics data that has been measured and recorded. The
statistics log can store up to 199 log entries. (To enable statistics logging, see Section
6.3.1.12.)
The meaning and format of the numbers is as follows:
• The user defines a measurement interval (see CONFIG, STATS) and during this
interval, Eb/No and Transmit Power Level Increase (TPLI) are observed, at a
1 second rate.
• At the end of this period, the average Eb/No is calculated and recorded, and the
minimum value seen in the interval.
• Similarly, the average TPLI is calculated, along with the highest value seen in the
interval.
If the demod has lost lock during the measurement interval, the
minimum Eb/No will show ‘LOSS’ rather than indicate a value.
However, the average value (while the demod was locked) will still be
IMPORTANT
calculated and shown. If, on the other hand, the demodulator has
been unlocked for the entire measurement interval, the average
Eb/No will also show ‘LOSS’. (The display will show ‘LOSS,LOSS’.)
• If the measured values are ≥ 16.0 dB, the display will show 16.0 dB.
• If AUPC is not enabled, the values of maximum and average TPLI will both
show ‘0.0'.
Example:
Example:
08.0,13.5,2.5,1.8 means:
Minimum Eb/No observed in the measurement interval = 8.0 dB
Average Eb/No observed in the measurement interval = 13.5 dB
Maximum TPLI observed in the measurement interval = 2.5 dB
Average TPLI observed in the measurement interval = 1.8 dB
LOSS,04.5,0.0,0.0 means:
There was a loss of demod lock during the measurement interval
Average Eb/No observed in the measurement interval = 4.5 dB
Maximum TPLI observed in the measurement interval = 0 dB
Average TPLI observed in the measurement interval = 0 dB (Which indicates
no AUPC activity, or that AUPC is disabled.)
Use the [←] or [→ ] arrow keys to select the CLEAR ALL option. Select Yes or No
using the [↑ ] or [↓] arrow keys and press ENTER to implement, or CLEAR.
6–38
Loading...
+ hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.