In this section:


Each of the 8 port connections on the RMC348 faceplate (Figure RMC348 ?RTMs Faceplate) access one T1/E1/J1 channel. For information about the location of the connectors, see DSC 8000 System Cards.

Warning

Before connecting the RMC348 to the lines, the continuity of the Protective Earth (PE) should be checked between the host and the shielded connectors of this module (if provided), to verify the earth connection.

Note

The method for connecting your DSC 8000 system’s communication ports depends on whether the cables are T1/J1 PRI lines or E1 PRI lines. Generally, carriers in North America and Japan provide a T1/J1 PRI line, and carriers in Europe and Australia provide an E1 PRI line.

Connecting to T1/J1 PRI Lines

When you connect the RMC348 to a T1/J1 PRI line, first determine the appropriate connection method, cabling requirements, and link requirements. For information about the cable requirements, see T1 and J1 Cabling Requirements.

Connection Method

If the line distance is less than 655 feet or 200 meters, and the lines do not go outdoors, you can connect the module in a DSX1 (short haul) configuration directly to the T1/J1 PRI line.

If the total distance of the line to the other end is more than 655 feet or 200 meters (up to 6,200 feet or 1.8 kilometers), or if the lines go outdoors, you must use an external channel service unit (CSU) placed near the RMC348 that translates the short haul DSX1 interface into the longer distance DS1 (long haul) interface.

Warning

Direct connection to lines that go outdoors are subject to constraints imposed by safety considerations. The AMC348 T1 ports do not support direct connection to outdoor lines because it does not provide enough galvanic isolation between the outdoor lines and the system. The AMC348 can’t be directly connected to the T1 PRI line in a DS1 configuration.


Connecting to E1 PRI Lines

When you connect the module to an E1 PRI line, first determine the appropriate connection method, cabling requirements, and link requirements. Generally, use a Network Termination 1 (NT1) device to interface between the system and the metallic interface of the network. A 120 Ohm twisted pairs cable is used for E1.

For more information about the cable requirements, see E1 Cabling Requirements.

E1 Link Requirements

If the system connects to an E1 line, the RMC348 and NT1 must be configured with several common parameters to interoperate. The RMC348 E1 parameters are in accordance with the IUT-T I 431 recommendation, as follows:

  • Line coding: HDB3, according to IUT-T G.703
  • Frame format: according to IUT-T G.704
  • CRC4 to Non-CRC4 operation: according to IUT-T G.706 An.B
  • Line I/O impedance: 120 Ohm ± 5%



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