ComStream CM601, Installation And Operation Manual

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1-2 Overview
The CM601 is a complete 4.8 to 512 kbps modem contained in a one-rack-unit-
high chassis. The modem card contains a modulator, demodulator, Doppler buffer,
and an RS-449/442 or V.35 interface port. The modem supports variable rates in
1 bps steps. The card offers QPSK and BPSK operations with Viterbi decoding at
rates of
1
/
2
,
3
/
4
, and
7
/
8
or sequential decoding rates of
1
/
2
and
3
/
4
. All programmable
modem features can be modified through the front panel or serial remote control
port.
The CM601 can inter-operate with standard, full-featured CM701 modems or
DT7000/8000 earth stations. CM701 or DT7000/8000 option cards, such as the
Reed-Solomon codec, satellite control channel (SCC), and the CX101/801 line of
redundancy switches are fully compatible with the CM601 modem.
Applications
The CM601 is particularly well-suited for bandwidth on demand or as a means to
support applications requiring more than one data rate. The CM601 is typically
used in the following applications:
Point-to-point, clear-channel applications that connect computers or support
trunk data traffic
Point-to-multipoint applications that support telephony, facsimile (fax), and
data using voice/data multiplexers
Point-to-point applications that support trunking telephony voice circuits
A single carrier per channel (SCPC) application using the ComStream CM601 is
shown in Figure 1-2.
Figure 1-2 SCPC Application Using the CM601
Demultiplexer
CM601
Indoor Unit
Outdoor Unit
Remote Station
#1
#2
Antenna
G630-01