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3 idr engineering service channel – Comtech EF Data CDM-600/600L User Manual

Page 177

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CDM-600/600L Open Network Satellite Modem

Revision 3

Open Network Operations

MN/CDM600L.IOM

12–5

12.4.3

IDR Engineering Service Channel

Bi-directional processing of the components of the ESC channel, including the ADPCM audio
channels, 8 kbps 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 kbps ESC data
channel in addition to (and with the same format as) the 8 kbps data channel.

When using G.703 format for the primary IDR data path, the P3B primary data interface (25-pin)
is used for the 8kbps overhead channel. If RS-422 or V.35 is used, P3B becomes the primary
interface and the 8kbps channel is unavailable.