Filter
Top Products
CRS-300 1:10 Redundancy Switch Revision 16
Cables and Connections MN/CRS300.IOM
4–60
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
I
MPORTANT
1. Traffic modems with differing data types are not supported by the Redundant
Modem. For example, the CRS-300 can not be populated with Traffic
modems with ASI and Traffic modes with HSSI.
2. Depending on the traffic data type, the appropriate jumper settings are
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.
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.
Table 4-3. CDM-710 Interface Card Combinations
CDM-710 Modem Configuration 1:N CRS-300 Configuration
Notes
Interface Slot 1 Interface Slot 2 TMI Card RMI Card
ASI (CDI-40) None
CRS-325 CRS-306
-
ASI (CDI-40)
GbE (CDI-70)
Can be used as
Redundant Modem
HSSI (CDI-60)
None
CRS-336
-
None
GbE (CDI-70) CRS-306 -
HSSI (CDI-60)
GbE (CDI-70)
Can be used as
Redundant Modem
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.