Span Configuration

Overview

This section describes the first step in the basic ISDN configuration sequence, span configuration.

Span configuration includes:

• Assigning Logical Span IDs

• Configuring the Span Format and Line Length

Assigning Logical Span IDs

First, de-assign spans you want to use for ISDN with the Assign Logical Span ID message to clear all D channels and facility assignments. De-assigning a logical span ID results in taking the span and all associated channels and facilities that are assigned out-of-service. Then, assign Logical Span IDs to spans to the spans with the Assign Logical Span ID message.

Configuring Span Formats

Set the format of the span on which the ISDN D channel resides using the T1 Span Configure or E1 Span Configure messages

Configure the framing and line coding for all ISDN PRI spans as follows:

T1

• Framing - ESF

• Line Coding - B8ZS

• Signaling - Clear Channel

E1

• Coding - HDB3

• Signaling - Clear Channel

Important! If an E1 span is not configured for Euro-ISDN, the encoding format for all ISDN E1 channels defaults to u-law. You must change the encoding format with the PCM Encoding Format Configure message prior to bringing channels into service. If the format is not changed, DSP resource requests will result in a NACK of DSP Not Configured For Requested Function (0x27).

Euro-ISDN E1

• Coding - HDB3

• Error Checking - Enable CRC (bit 1) and FEBE (bit 2)

• Signaling - Clear Channel (bit 3)/E1 Layer 1 Management
(bit 5)

• Line Length - G.703.

Austel-ISDN

• Coding - HDB3

• Error Checking - Enable CRC (bit 1) and FEBE (bit 2)

• Signaling - Clear Channel (bit 3)/E1 Layer 1 Management (bit 6)

• Line Length - G.703.