Chapter 3: Connecting to the Line

E1 Link Requirements

If the board connects to the E1 line, the board and NT1 must be configured with several common parameters to interoperate. The board’s 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.BLine I/O impedance: 120 Ohm ± 5%

5536 PRI RAS Communications Controller Users Guide

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