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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.

See Integrated Services Digital Network.
Range of channels provided by T1 or E1 transmission service. A physical span is a group of channels taking up a single physical wire. A logical span is a group of channels taking up less than a single logical wire, or carried over more than one physical wire.
Options for line length when configuring a T-1 span on a Excel platform are as follows.
0 - 133 Feet
134 - 166 Feet
167 - 299 Feet
300 - 533 Feet
534 - 655 Feet
G.703 ITU-T
Digital communications link - voice, data, and video at a 1.544 Mbps rate (24 64 Kbps channels)
A digital communications link - voice, data, and video at a 2.048 Mbps rate; 30B/2D or 31B/1D (ISDN); non-North American version of T1.
Error control procedure for digital communication channels providing definable bit patterns to allow the receiver to identify the start of each frame of data and the signaling data.
Extended Super Frame
Bipolar with 8-Zero Substitution. Coding method used with Clear Channel signaling to allow true 64Kbps channel data transmission speeds. See also ZBTSI.
Signaling technique where the full channel bandwidth is used for data transmission, while the framing and control bits (signaling) use a separate channel. No control or signaling is performed on this path. See B8ZS and ZBTSI.
See Pulse Code Modulation.
Digital Signal Processor
Negative acknowledgement to a message.