Idr Framing; Idr Engineering Service Channel; C.11.3 Idr Framing - Comtech EF Data SDM-300A Installation And Operation Manual

SDM-300A Satellite Modem
C.11.3

IDR Framing

Multiplexes in compliance with the standard IESS-308 96 kbit/s ESC overhead onto the
data and provides both the data and rate exchanged clock to the modulator portion of the
base modem.
Performs the corresponding demultiplexing of RX satellite data received from the
demodulator portion of the modem. Resulting G.703 data is optionally encoded (AMI,
B8Z5, or HDB3) before being output on the 50-pin connector.
C.11.4

IDR Engineering Service Channel

Bi-directional processing of the components of the ESC channel, including the ADPCM
audio channels, 8 kbit/s data channel, and fault indications specified by IESS-403 and
IESS-308.
Option of using the ADPCM portion of the satellite overhead for a single 64 kbit/s ESC
data channel in addition to (and with the same format as) the 8 kbit/s data channel.
Rev. 4
Specifications
C–53