Comtech EF Data CRS-300 - Manual (Page 142)

CRS-300 1:10 Redundancy Switch MN/CRS300.IOM
Cables and Connections Revision 19
4–68
4.9 CDM-710 Modem Connections
When adding a modem to an operating 1:N system, you must take care not to 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 Sect. 6.2.2.5 CONFIG: ACTIVE (Activate Modems).
4.9.1 RMI/TMI Limitations and Considerations
1) Traffic modems with differing data types are not supported by the Redundant
Modem. For example, the Switch 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 Switch TMI to ensure proper operation for HSSI with CA/TA
signals using the CRS-336 TMI. See Chapter 5. MODEM, TMI, AND SWITCH
CONFIGURATION for this important configuration information.
4.9.2 Interface Combinations
The two plug-in interface module slots in the CDM-710 allow for many possible interface card
combinations. The Switch can cover many of these combinations, but not all – capability is
limited by the Switch’s backplane configuration. For example, if you configure the Switch
backplane to handle one HSSI interflow, then this limits the supported Redundant and Traffic
modems to one HSSI interface per unit as well. Table 4-3 details the CDM-710 interface card
combinations that are compatible with the Switch.
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 either 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.