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CDM-600 Satellite Modem Revision 7
Open Network Operations MN/CDM600.IOM
9–3
Buffer Clock Reference Derived from Insert Data In (Insert Clock)
External, RX (satellite) or TX (Terrestrial)
Asynchronous Engineering Service Channel
ESC Data Interface Type EIA-232, Asynchronous
ESC Data Rate 1/2000 of primary data rate
ESC Data Circuits Supported SD, RD, DSR
Synchronous Engineering Service Channel
ESC Data Interface Type EIA-232, synchronous to primary data
ESC Data Rate 1/480 of primary data rate
ESC Data Circuits Supported SD, ST, RD, RT, DSR
Faults and Alarms
Satellite Backward Alarm 1 (per IESS-309)
Receive BWA Output Enabled onto terrestrial secondary alarm
9.3.1 D&I Primary Data Interfaces
When configured for D&I operation, multiplexing/demultiplexing follows the IBS
satellite frame structure and ESC features, but with the following changes:
• Accepts and outputs primary data through the G.703 connectors.
• The data rate must be at T1 or E1 rates only. This includes additional links
for Drop Data Out and Insert Data In.
• Clock recovery, dejitter, and encoding/decoding are performed as before.
9.3.2 D&I Framing
The IBS satellite framing/deframing is applied only to selected time slots of the data’s
G.704 terrestrial structure.