Ibs Framing; Ibs Engineering Service Channel; Ibs Scrambling; C.9.4 Ibs Framing - Comtech EF Data SDM-300A Installation And Operation Manual

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SDM-300A Satellite Modem

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.

Bi-directional processing of the components of the ESC channel, including the

asynchronous or synchronous EIA-232 data channel, and fault/alarm indications.

Provides the synchronous scrambling/descrambling of the satellite framed data specified

in IESS-309. Base modem scrambling/descrambling is assumed to be disabled in this

Specifications