Avaya 03-300430 User Manual

Note:

Many trunk problems are caused by incorrect settings of parameters on the trunk 
group administration screen. Settings must be compatible with the local 
environment and with parameter settings on the far end. See Administrator Guide 
for Avaya Communication Manager, 03-300509. The Application Notes section of 
that book shows the correct settings for administrable timers and other 
parameters on a country-by-country basis.

Note:

See the figures in the 

maintenance object for an illustration of the principles described below. 
Throughout this section, the general term DS1 circuit pack refers to TN464 and 
TN767 series circuit packs for systems supporting circuit packs (S8700, S8500), 
and to MM710 DS1 Media Modules for systems supporting media modules 
(S8300, G700, G350).

For additional repair information, see also 

on page 978 for 

TN767 ports, 

on page 2374 for TN464C or higher 

suffix ports, and 

on page 1594 for MM710 Media 

Module ports.
A DS1 ISDN trunk is a 64-kbps bearer channel used to transmit digitized voice or data traffic. 
These trunks, or B channels, use a separate channel, the D channel for call-control signaling. 
This mode of operation is known as out-of-band signaling, as opposed to in-band robbed-bit 
signaling, in which signaling is carried in the same channel as the voice or data traffic. One D 
channel, or ISDN signaling link (ISDN-LNK), carries signaling messages for several B channels, 
forming an ISDN signaling group (ISDN-SGR).
A B channel may be a port on a TN464 series UDS1 circuit pack, a TN767 series DS1 Interface 
circuit pack, or an MM710 DS1 Interface Media Module.

ISDN-TRK

MAJ

1

1. A MAJOR alarm on a trunk indicates that alarms on these trunks are not 

downgraded by the set options.

test port location l

DS1 ISDN Trunk

ISDN-TRK

MIN

test port location l

DS1 ISDN Trunk

ISDN-TRK

WRN

test port location s

DS1 ISDN Trunk