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CRS-300 1:10 Redundancy Switch
Cables and Connections
4.5
CDM-625 Modem Connections
If adding a modem to an operating 1:N system, care needs to be taken to not interfere with the
existing traffic. The cabling and power-up sequence must be correct to avoid contention in the
system from the modem Tx carrier. This sequence is detailed in
ACTIVE MODEMS
4.5.1 RMI/TMI Limitations and Considerations
With some exceptions, Traffic modems with differing data types can all be supported by the
Redundant Modem.
Refer to Table 4-1 for the RMI, TMIs, and cables required to set up a properly configured
redundant system. As shown, and regardless of driving traffic data type, the CRS-300 1:10
Redundancy Switch uses the CRS-310 Redundant Modem Interface (RMI) for all driving traffic
configurations.
When using the CDM-625 in a CRS-300 1:10 Redundancy system, TMIs may be mixed within
the same CRS-300 with some limitations: while the "P2" (DB-15M) connector on the CRS-310
RMI may be used for Balanced / Unbalanced G.703 or Quad E1 traffic, only one of these two
traffic data types can be used within the TMIs. Accordingly, a CRS-300 that uses any
combination of the CRS-325, CRS-330, or CRS-340 TMIs for Balanced / Unbalanced G.703
traffic cannot have the CRS-365D TMI (for Quad E1 traffic) installed in the same system.
Refer to Figure 4-10 through Figure 4-12 for graphic examples of this operational dependency;
each figure shows permissible TMI types that can be used for the Traffic Modems.
1. Depending on the traffic data type, the appropriate jumper settings are
IMPORTANT
2. When using the CDM-625 in Dedicated Management Port mode, all four of the
4.5.2
Carrier-in-Carrier
The CA-0000275 cable bypasses the CRS-300 1:10 Redundancy Switch.
IMPORTANT
If Carrier-in-Carrier
connect and secure the PMSI Multi-drop CnC Plus Cable CA-0000275 (<11X> DB-9M, 8.25')
between the Redundant CDM-625 and any CnC-enabled Traffic CDM-625(s) as follows:
•
DB-9F connector labeled "PMSI" on the Redundant CDM-625, to
•
DB-9F connectors labeled "PMSI" on all CnC-enabled Traffic CDM-625(s).
.
provided on the TMI to ensure proper operation for EIA-422 with RTS/CTS,
DTR/DSR signal using the CRS-316, CRS-320 (obsolete), or CRS-340 TMI; or
HSSI with CA/TA signals using the CRS-336 TMI. Refer to Chapter 4.
MODEM, TMI, AND SWITCH CONFIGURATION in this manual for this
important configuration information.
offline modem's Ethernet ports will be disabled unless the user configures
one of the four ports as the 'Dedicated Management Port.' For more
information, refer to Sect. 5.4.13.3 CONFIG: IP
Advanced Satellite Modem Installation and Operation Manual.
®
(CnC) Data Connections
®
(CnC) is utilized with any Traffic CDM-625, refer to Figure 4-9 to
4–22
Revision 16
MN/CRS300.IOM
Chapter 7.4.5 (CONFIG)
Setup in the CDM-625
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