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CDM-600L Satellite Modem
Introduction
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.
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.
1.3.4
Hardware Options
There are five hardware options available. There are two Comtech EF Data Turbo
Product Codecs, representing a very significant development in the area of FEC. They are
plug-in daughter cards (SIMM modules), both field upgradeable. The Low Rate option
provides data rate capability up to 5 Mbps, and code rates limited to Rate 5/16 (BPSK,
Rate 21/44 (BPSK) and Rate 3/4 (QPSK, Offset QPSK, 8-PSK and 16-QAM). The High
Rate option provides data rate capability up to 20 Mbps, in addition to Rate 7/8 and Rate
0.95 capability. Turbo Product Coding provides the best Forward Error Correction
technology currently available, and is now offered with a sufficient range of code rates
and modulation types to optimize link performance under any conditions.
The third hardware option is the Internal Reference Stability. The high stability option
includes a 2 x 10
stability option places a 1 x 10
must be fitted in the factory at the time of order.
-8
10 MHz reference oscillator on the modem board, while the low
-6
10 MHz reference on the modem board. This option
1–5
Revision 0
MN/CDM600L.IOM
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