ADC Kentrox ISDN NT1 1010 Spécifications télécharger pdf (Page 339)

100

101

Reference Guide

7-27

WAN Card WAN Card User Screens and Settings

The WAN links between the Device and the System Unit (A, B, A1, and B1) are called

tributaries

. The WAN link between the two SYS Units (C and C1) is referred to as a

trunk

In the normal condition (no WAN groups selected), a failure on any of the tributaries supplying

Device 1 would be reported at SYS 1 and Device 1 only. A failure of the trunk from C to C1

would be reported at SYS 1 and 2 only.

When Groups are created at both system units, a trunk failure (C to C1) will inform all of the

associated tributaries (A and B, A1 and B1) of that condition.

When groups are used in conjunction with the Network Management option (mentioned

earlier) and the AIS/ALM is set to

tcodr

, a failure of any of the tributaries will propagate the

failure through the trunk to the associated tributary at the other end (A to A1 or B to B1).

The following notification procedure is followed:

1. A Loss of Signal, Loss of Frame, Error Rate Exceeded, or AIS failure of the transmit

leg of W1-1(A) occurs between Device 1 and SYS 1.

2. SYS 1 detects the failure on the receive leg and declares an alarm for W1-1(A).

3. SYS 1 sets the A Bit (Yellow Alarm) in the transmit leg of W1-1(A). Device 1 detects

this condition and knows not to use W1-1(A).

4. SYS 1(C) sends an alarm message to SYS 2 (C1), telling it that W1-1(A) is either in a

CGA_RED or AIS alarm.

5. SYS 2 sets the transmit leg of W3-1(A1) into AIS (CGA_RED). Device 2 detects this

condition and knows not to use W3-1(A1).

When the original failure is corrected, the alarm is also cleared for downstream tributaries.

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ADC Kentrox ISDN NT1 1010 Spécifications Page 339

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