E1/PRI Line

E1/PRI Line

When you connect the board to an E1/PRI line, first determine the appropriate connection method, cabling requirements, and link requirements.

Connection Method

Generally, your E1/PRI carrier provides a Network Termination 1 (NT1) device to interface between the WAN board and the metallic interface of the WAN. You need to connect the WAN board to the NT1, as shown in the following illustration:

WAN Adapter

NTI

Telco

Figure 3-4. Connection Through an External NT1 Device

E1/PRI Cabling Requirements

The cable between the board and the NT1 must meet the following standard E1 attenuation and transmission requirements:

120 Ohms

Two twisted pairs, category 3 or better

Maximum length: 200 m (655 feet)

The cable must include an RJ48C plug at the end dedicated to the WAN board. It must also provide the appropriate plug or cabling system at the end dedicated to the NT1. See Connector Pinouts on page 34 and your NT1 documentation for details.

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Interphase Corporation