Comtech EF Data CRS-500 - Manual (Page 74)

CRS-500 1:N Redundancy System Revision 2
Cables and Connections MN-CRS500
4–18
4.3.1.5 CDM-625 IF Cable Connections
Refer to Sect. 4.4 for information and examples for the establishment of IF cabling for single and
multiple transponder configurations, with or without the use of the CRS-500’s CRS-282xx Tx/Rx
IF Switch Units (ISUs).
4.3.1.6 CRS-500 DSU
 CDM-625 User Data Interface Connections
Because the Redundant Modem’s function is to replace a faulted Traffic Modem,
the RMI does not have a User Data Interface.
Connect the traffic data from an external router, switch, or test data generator to the TMI
connectors labeled “User Data Interface.” This interface replaces the direct connection to the
Traffic CDM-625’s “Data Interface” connectors.
4.3.1.7 CDM-625 Carrier-in-Carrier
®
(CnC) Data Connections
The CA-0000275 cable bypasses the CRS-500 1:N Redundancy System.
The CDM-625’s DoubleTalk TM Carrier-in-Carrier ® (CnC) option uses a patented signal processing
algorithm. CnC uses adaptive cancellation to allow both the forward and reverse carriers of a full
duplex link to share the same segment of transponder bandwidth.
Referring to Figure 4-7:
If CnC is used with any Traffic Modem, connect and secure the CA-0000275 PMSI Multi-drop
CnC ® Plus Cable ([11X] DB-9M, 8.25’) between the Redundant Modem and any CnC-enabled
Traffic Modem(s) as follows:
• DB-9F connector labeled “PMSI” on the Redundant Modem, to
• DB-9F connector labeled “PMSI” on each CnC-enabled Traffic Modem.