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Network interfaces and equipment 10 Networking
Overview
555-233-001 — Issue 2 — November 2000
10-
8
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.