D&I Primary Data Interfaces; D&I Framing - Comtech EF Data CDM-600 Operating Instructions Manual

CDM-600 Satellite Modem
Open Network Operations
Buffer Clock Reference
ESC Data Interface Type
ESC Data Rate
ESC Data Circuits Supported
ESC Data Interface Type
ESC Data Rate
ESC Data Circuits Supported
Satellite Backward Alarm
Receive BWA Output
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:
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.
Asynchronous Engineering Service Channel
Synchronous Engineering Service Channel
•
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.
Derived from Insert Data In (Insert Clock)
External, RX (satellite) or TX (Terrestrial)
EIA-232, Asynchronous
1/2000 of primary data rate
SD, RD, DSR
EIA-232, synchronous to primary data
1/480 of primary data rate
SD, ST, RD, RT, DSR
Faults and Alarms
1 (per IESS-309)
Enabled onto terrestrial secondary alarm
9–3
Revision 7
MN/CDM600.IOM