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

SDM-300A Satellite Modem
C.9.4

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.
C.9.5

IBS Engineering Service Channel

Bi-directional processing of the components of the ESC channel, including the
asynchronous or synchronous EIA-232 data channel, and fault/alarm indications.
C.9.6

IBS Scrambling

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
mode.
Rev. 4
Specifications
C–49