Avaya 555-233-001 manual Network interfaces and equipment, Trunk group circuits

Network interfaces and equipment 10 Networking

Network interfaces and equipment

DEFINITY ONE supports a variety of interfaces to voice and data networks. Trunks supply links between DEFINITY ONE, the public network, and other switches. DS1 interfaces offer high-speed digital connectivity between switches.

Trunk group circuits

Trunks provide the communications links between DEFINITY ONE and other switches, including central office switches and other premises switches. Trunks that perform the same function are grouped together and administered as trunk groups. Trunks interface with DEFINITY ONE via port circuit packs. DEFINITY ONE’s trunk group circuit types include the following:

Local exchange trunks Local exchange trunks connect DEFINITY ONE to a central office. The following are some of the types available:

• Central office trunks, which connect DEFINITY ONE to the local central office for incoming and outgoing calls

• Foreign exchange trunks, which connect DEFINITY ONE to a central office other than the local one

• Wide Area Telecommunications Service trunks, which allow you to place long- distance outgoing voice-grade calls to telephones in defined service areas, priced according to distance in the service area, length of the call, time of day, and the day of the week

• 800-service trunks, which let your business pay the charges for inbound long- distance calls so that callers can reach you toll-free

• Direct Inward Dialing (DID) trunks, which connect DEFINITY ONE to the local

	central office for incoming calls dialed directly to stations without attendant
	assistance
	• Digital Service 1 (DS1) trunks, which can be used to provide ISDN Primary Rate
	Interface local exchange trunk services. DS1 by itself can be used to provide local
	exchange trunk services
Tie trunks	Tie trunks carry communications between DEFINITY ONE and other switches in a
	private network. Several types of trunks can be used, depending on the type of private
	network you establish.
Auxiliary trunks	Auxiliary trunks connect devices with the switch. Some of the features that are
	supported with this type of trunk are recorded announcements, telephone dictation
	service, malicious call trace, and loudspeaker paging.

	Overview
10-8	555-233-001 — Issue 2 — November 2000