Comtech EF Data CDM-625A Installation And Operation Manual page 716

Advanced satellite modem (18 kbps – 25 mbps)

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CDM-625A Advanced Satellite Modem

P.2.1 IBS Clock/Data Recovery and De-jitter

This feature performs clock and data recovery on the G.703 format. Clock de-jitter and data

encoding/decoding is done as with the IDR configuration.

P.2.2 IBS Framing

IBS Framing multiplexes/demultiplexes the primary data in compliance with the standard IESS-

309 overhead ratio of 1/15 (4 overhead bytes per 60 data bytes) and provides the rate

exchanged transmit clock to the modulator portion of the base modem.

P.2.3 IBS Engineering Service Channel

The IBS Engineering Service Channel provides bi-directional processing of the components of the

ESC channel, including the ASYNC or SYNC EIA-232 data channel, and fault/alarm indications.

Alternately, a high-rate ESC channel – at up to 1/20

using Async EIA-232 format.

P.2.4 IBS Scrambling

IBS Scrambling provides the synchronous scrambling/descrambling of the satellite-framed data

specified in IESS-309. Base modem scrambling/descrambling is disabled in this mode.

of the primary data rate – is available,

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