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CDM-600 Satellite Modem Revision 7
Introduction MN/CDM600.IOM
1–9
1.5 New in this Release
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
nd
Generation TPC functionality. This new codec is supported in in
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.