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CDM-Qx Satellite Modem Revision 5
Introduction MN/CDMQx.IOM
1–6
1.4 FAST Options and Hardware Options
The Modem is extremely flexible and powerful, and incorporates a large number of
optional features. Some customers may not require all of these features, and therefore, in
order to permit a lower initial cost, the Modem may be purchased with only the desired
modules and features enabled. If, at a later date, a customer wishes to upgrade the
functionality of a modulator or demodulator, Comtech EF Data provides a system known
as FAST (Fully Accessible System Topology) which permits the purchase and
installation of options through the use of special authorization codes, entered through the
front panel, or remotely.
The base configuration of the modulators and demodulators are equipped with Viterbi
and R-S codecs. It offers modulation types, and data rates up to 5 Mbps. It is, however,
limited to Closed Network operation.
The following table shows what other options are available:
Modulator & Demodulator
Options
Description and Comments
Option
Installation
Method
Low Rate Variable Data rate 32 kbps to 5 Mbps Base Unit
Mid-Rate Variable Data rate 32 kbps to 10.0 Mbps FAST
Full Rate Variable Data rate 32 kbps to 20.0 Mbps FAST
8-PSK Modulation Type FAST
16-QAM Modulation Type FAST
DoubleTalk Carrier-in-Carrier 128 ksps – 512 kbps FAST
DoubleTalk Carrier-in-Carrier 128 ksps – 1 Mbps FAST
DoubleTalk Carrier-in-Carrier 128 ksps – 2.5 Mbps FAST
DoubleTalk Carrier-in-Carrier 128 ksps – 5 Mbps FAST
DoubleTalk Carrier-in-Carrier 128 ksps – 1.0 Mbps FAST
DoubleTalk Carrier-in-Carrier 128 ksps – 20 Mbps FAST
Redundancy Capability 1:1 or 1:2 or 1:3 Redundancy FAST
Turbo Codec – high rate 20 Mbps Turbo Codec Hardware
High Stability Reference Internal 10 MHz reference – 0.1 x 10
-6
Hardware*
Low Stability Reference Internal 10 MHz reference – 1 x 10
-6
Hardware*
75Ω TX/RX Impedance 75Ω impedance with BNC female connectors
Hardware*
50Ω TX/RX Impedance 50Ω impedance with N female connectors (L-
Band)
Hardware*
*Factory installed only.