Comtech EF Data CRS-500 - Manual (Page 78)

CRS-500 1:N Redundancy System Revision 2
Cables and Connections MN-CRS500
4–22
4.3.2.2 CRS-500

CDM-750 Control Cable Connections
For 1:N connections between the CRS-500 CSU and CDM-750 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), so it is
always required.
1. The CDM-750’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 CDM-750 is equipped with
the optional G.703 Plug-In Interface Cards (PIIC). This traffic data type requires
the CRS-345 TMI.
Referring to Figure 4-8 (for GbE Ethernet Traffic Data Control/Comm) or Figure 4-9 (for G.703
Unbalanced Traffic Data Control/Comm):
• First, for the Redundant Modem, connect the CA-0000069 Control Cable between the
Redundant Modem and the CRS-505 RMI as follows:
o
Redundant Modem DB-9F connector labeled “J2 | REDUNDANCY” to
o
CRS-505 RMI HD-15F connector labeled “J1 | Control”.
• Then, for each Traffic modem, connect a CA-0000069 Control Cable between each TMI
and its corresponding Traffic Modem as follows:
o
HD-15F connector labeled “J1 Control” on CRS-516 TMI or “J1 Faults” on CRS-345
TMI to
o
Modem DB-9F connector labeled “J2 | REDUNDANCY”.