A major alarm on a trunk indicates that alarms on these trunks are not downgraded by set options and that at least 75 percent of the trunks in this trunk group are alarmed.
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. Refer to Administering Avaya Aura® Communication Manager for information on how to administer trunks. Contact your Avaya representative for the correct settings for administrable timers and other parameters on a country-by-country basis.
A DS1 Direct Inward Outward Dialing (DIOD) trunk provides a link for digitized voice or data communications between the system and a central office switch. There are two types of DS1 interfaces:
24 DS0 channels on a 1.544-Mbps link
31 DS0 channels + 1 framing channel on a 2.048-Mbps link
The DS1 media module supports low-level CO trunk signaling interfaces for both ground-start and loop-start trunks. This maintenance strategy covers the inline errors log, initialization tests, periodic tests, scheduled tests, demand tests, and alarm resolution and escalation.
Three trunk service states are specified by DS1 DIOD trunk maintenance:
out-of-service
The trunk is in a deactivated state and cannot be used for either incoming or outgoing calls.
in-service
The trunk is in an activated state and can be used for both incoming and outgoing calls.
disconnect (ready-for-service)
The trunk is in an activated state, but can only be used for an incoming call.
