Comtech EF Data KST-2000B Dokumentacja Strona 151

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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.
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