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CRS-300 1:10 Redundancy Switch Revision 16

Cables and Connections MN/CRS300.IOM

4–16

4.4 CDM-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.

MPORTANT

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

Modem.

4.4.1 Control 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.

MPORTANT

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

using the CRS-370 TMI. Refer to Chapter 4. MODEM, TMI, AND SWITCH

CONFIGURATION for this important configuration information.

Refer to Figure 4-7 to 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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Comtech EF Data CDM-700 Specifiche Pagina 76