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CDM-600L Satellite Modem
Introduction
In order to operate in Turbo (TPC) Mode:
To operate in 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 / 8-
QAM FAST option enabled.
For example, if LDPC operation at 20 Mbps, 8-QAM mode is required, the modem must
be configured with the following:
•
TPC/LDPC Codec hardware option
•
Full rate variable FAST option
•
High-Rate LDPC FAST option
•
8-PSK /8-QAM FAST option
1.3.1
FAST Accessible Options
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 on-
location 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.
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Revision 2
MN/CDM600L.IOM
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