Comtech EF Data CRS-500, Installation And Operational Manual

Page: 79 / 220

CRS-500 1:N Redundancy System
Revision 4
Cables and Connections 5–19 MN-CRS-500
5.3.2.2 CRS-500

CDM-750/760 Control Cable Connections
For 1:N connections between the CRS-500 CSU and CDM-750 or CDM-760 Modems:
The CA-0000069 Control Cable (HD-15M to DB-9M, 6’) provides the modem’s fault status
information to the CRS-500 as well as the control path to the modem’s external Tx IF-mute (for
the offline modem). Therefore, it is always required.
1. The modem’s “J3 | REMOTE” port is not used in CRS-500 operations.
2. Do not connect directly to any modem for User Remote M&C Connections. All User
Remote M&C connections should use the CSU rear panel CRS-530 System Controller
Serial “Remote Control” or Ethernet “10/100 M&C” ports.
3. G.703 Unbalanced traffic is possible only when the modem is equipped with the optional
G.703 Plug-In Interface Cards (PIIC). This traffic data type requires the CRS-345 TMI.
See Figure 5-8 (for GbE Ethernet Traffic Data Control/Comm) or Figure 5-9 (for G.703
Unbalanced Traffic Data Control/Comm). Do these steps:
1. For the Redundant Modem, connect the CA-0000069 Control Cable between the
Redundant Modem and the CRS-505 RMI:
a. Redundant Modem DB-9F connector labeled “J2 | REDUNDANCY” to
b. CRS-505 RMI HD-15F connector labeled “J1 | Control”.
2. For each Traffic Modem, connect a CA-0000069 Control Cable between each TMI and its
corresponding Traffic Modem:
a. HD-15F connector labeled “J1 Control” on CRS-516 TMI or “J1 Faults” on CRS-
345 TMI to
b. Modem DB-9F connector labeled “J2 | REDUNDANCY”.