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E1/PRI Line
32 Interphase Corporation
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:
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.
WAN Adapter
WAN Adapter
Telco
Telco
NTI