Fast System Theory; Implementation; Hardware Options; Supporting Hardware And Software - Comtech EF Data CDM-625 Installation And Operation Manual

CDM-625 Advanced Satellite Modem
Introduction
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 modem. The Activation Procedure is described in Appendix C.
1.4.4

Hardware Options

Several hardware options are available:
• Combination Low-density Parity Check (LDPC) and TPC Codec - a plug-in
daughter card that can be factory-installed at the time of ordering, or installed by the
user in the field. This is capable of data rates up to 25 Mbps, and provides the full
range of code rates/modulation.
• DoubleTalk
installed at the time of ordering, or installed by the user in the field.
• BUC power supplies – either 24 or 48 volt options.
• AC (115/230 volt) or DC (-48 volt) unit power supply options.
1.4.5

Supporting Hardware and Software

For 1:1 applications the CDM-625 is supported by the CRS-170A (L-Band) and CRS-180 low-cost
external switchs. For Hub applications, the CDM-625 is supported by a 1:N switch, the CRS-300.
The CDM-625 is a companion product for the Comtech EF Data line of RF Transceivers. The
Modem incorporates an FSK serial link that can be activated on the Rx-IF port for the purpose of
communicating with a ComtechTransceiver (CSAT or KST), if connected. In this manner, a user
may monitor, configure, and control the Transceiver, using the front panel display and keypad of
® ®
Carrier-in-Carrier option - a plug-in daughter card that can be factory-
1–7
MN-0000036 (Ref MN/CDM625.IOM)
Revision 1