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CDM-600L Satellite Modem
Introduction
1.3.5
Supporting Hardware and Software
The CDM-600L incorporates an FSK serial link that can be activated on the TX-IF port
for the purpose of communicating with an FSK capable BUC. In this manner, a user may
monitor, configure, and control the BUC using the front panel display and keypad of the
modem or the modem's remote control interface. The EDMAC channel can be used to
convey M&C interface to a BUC at the distant end of a satellite link if it is connected to a
CDM-600L. This FSK interface with the BUC includes a BUC output power leveling
mode where the modem M&C monitors the detected BUC output power level reported on
the FSK link, and automatically adjusts the modem transmit output power to maintain a
constant BUC transmit output level.
The CDM-600L 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, contact the factory.
1.4
Compatibility
The CDM-600L is fully backwards-compatible with the Comtech EF Data CDM-500,
CDM-550, CDM-550T, and CDM-600 modems.
Being an Open Network Modem, the CDM-600L is fully compatible with modems from
other manufacturers that are compliant with the IESS-308/-309/-310/-314/-315
specifications.
1.5
New in this Release
Revision 2 of this document includes information on the the following new features:
* Low-Density Parity Check (LDPC) Codec (supported in Firmware Version 1.3.0
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
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 1.3.0 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 1.3.0 onwards. Please see
Chapter 13 for more details.
nd
Generation TPC (Turbo) functionality. Please see Chapter 7 for
1–7
Revision 2
MN/CDM600L.IOM
TM
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