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CRS-300 1:10 Redundancy Switch
Cables and Connections
4.8
CDM-710 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, power-up sequence and communication connections must be correct
to avoid contention in the system from the modem Tx carrier. This information is detailed in
Chapter 7.4.5 (CONFIG) ACTIVE MODEMS
4.8.1
RMI/TMI Limitations and Considerations
1. Traffic modems with differing data types are not supported by the Redundant
2. Depending on the traffic data type, the appropriate jumper settings are
IMPORTANT
4.8.2
Interface Combinations
With (2) interface card slots available in the CDM-710 modem, there are many possible
interface card combinations. The CRS-300 can cover many of these combinations, but not all.
capability is limited by the CRS-300's backplane configuration. For example, if the CRS-300's
backplane is configured to handle one HSSI interflow, then the supported Redundant and Traffic
modems are limited to one HSSI interface per unit as well. Table 4-3 provides details for the
CDM-710 interface card combinations that are compatible with the CRS-300.
CDM-710 Modem Configuration
Interface Slot 1
ASI (CDI-40)
ASI (CDI-40)
HSSI (CDI-60)
None
HSSI (CDI-60)
Notes:
1. The Redundant Modem must have the same interface cards in each slot as any of the
Traffic Modems.
2. The Traffic Modem must have the same interface cards in each slot as any of the other
Traffic Modems have, or a blank panel installed.
3. Interface Slots 1 and 2 are not active simultaneously .
Modem. For example, the CRS-300 can not be populated with Traffic
modems with ASI and Traffic modes with HSSI.
provided on the TMI to ensure proper operation for HSSI with CA/TA signals
using the CRS-336 TMI. Refer to Chapter 4. MODEM, TMI, AND SWITCH
CONFIGURATION for this important configuration information.
Table 4-3. CDM-710 Interface Card Combinations
Interface Slot 2
None
GbE (CDI-70)
None
GbE (CDI-70)
GbE (CDI-70)
.
1:N CRS-300 Configuration
TMI Card
RMI Card
CRS-325
CRS-306
CRS-306
CRS-336
4–60
Revision 16
MN/CRS300.IOM
Notes
-
Can be used as
Redundant Modem
-
-
Can be used as
Redundant Modem
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