Mocomtech CDM-600/600L Modem Connections, Control and Data Connections CRS-300 to Modems

CRS-300 1:10 Redundancy Switch	Revision 16
Cables and Connections	MN/CRS300.IOM

4.4CDM-600/600L 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 Chapter 7.4.5 (CONFIG) ACTIVE MODEMS.

Traffic modems with differing data types can all be supported by the Redundant Modem.

IMPORTANT

4.4.1Control and Data Connections – CRS-300 to Modems

The 25-pin Control/Data Cable CA/WR0066 provides the EIA-422/-232/LVDS traffic data path and serial communication path between the Switch and the modems, and is therefore always required even if the data type is G.703.

Depending on the traffic data type, the appropriate jumper settings are provided on the TMI to ensure proper operation for EIA-422 with RTS/CTS, DTR/DSR signals using the CRS-340 TMI, and for HSSI with CA/TA signals

IMPORTANT using the CRS-370 TMI. Refer to Chapter 4. MODEM, TMI, AND SWITCH CONFIGURATION for this important configuration information.

Refer to Figure 4-7to connect and secure the CA/WR0066 cables between each CDM-600/600L and the CRS-300 as follows:

•DB-25M connector labeled “P1” on the RMI or TMI(s), to

•DB-25F connector labeled “P3B Data Interface” on the CDM-600/600Ls.

If G.703 is the traffic data type, also connect the CA/WR9038-6 data cable, used for either Balanced or Unbalanced G.703 data, as follows:

•DB-15M connector labeled “P2” on the RMI or TMI(s), to

•DB-15F connectors labeled “P7 Balanced G.703” on the CDM-600/600Ls.

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