Alarm Settings; Alarm Descriptions - Panasonic T-SMART DBS-EX23-530 Reference Manual

Philips telephone user manual

Table of Contents

Programming Reference

Alarm Settings

ISDN alarms can be reported through LEDs on the ISDN card, an alarm relay

on the ISDN MDF card, or FF keys on a key phone. Table 4-1 summarizes

the types of alarms that can occur with the ISDN. Table 4-2 summarizes

alarm settings for all three types of alarms.

Table 4-1. ISDN alarm definitions

Alarm

Description

Red

The DBS activates a red alarm when a loss of sig-

nal or out-of-frame condition lasts for more than

2.5 seconds.

Yellow

A yellow alarm is sent to the distant end of the

ISDN link to indicate that a red alarm has occurred.

If a red alarm occurs at the CO, the CO sends a yel-

low alarm to the DBS. If a red alarm occurs at the

DBS, the DBS sends a yellow alarm to the CO.

Frame

The DBS activates an OOF alarm when more than

one out of four consecutive framing bits is in error.

Loss

Slip

The DBS activates a slip alarm when a data bit is

lost due to a frame misalignment. Frame misalign-

ment is caused by timing errors.

Sync

The DBS activates a sync loss alarm due to timing

errors. Timing errors result in frame misalignment.

Loss

AIS

The CO sends an AIS (Alarm Indication Signal) to

indicate an "out-of-service" condition on the net-

work side. The AIS, also referred to as the "keep

alive signal," is comprised of all 1s and is

unframed. The DBS sends an AIS through the

"AIS Signal Transmission" code (page 4-37).

Revised April 2000

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