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CDM-Qx Satellite Modem Revision 5
Introduction MN/CDMQx.IOM
1–7
1.4.1 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.
1.4.2 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.
1.4.3 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 product. The Activation Procedure is described in
Appendix C.
1.4.4 Hardware Options
There are four hardware options available.
There is the Comtech EF Data Turbo Product Codec (TPC), representing a very
significant development in the area of FEC. It consists of a plug-in daughter card
(SIMM module) that is field upgradeable. The TPC option provides data rate capability
up to 20 Mbps, and code rates of:
• Rate 5/16 (BPSK)
• Rate 21/44 (BPSK, QPSK)
• Rate 3/4 (QPSK, 8-PSK, and 16-QAM)
• Rate 7/8 (QPSK, 8-PSK, and 16-QAM)
• Rate 17/18 (QPSK, 8-PSK)