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DEFINITY Enterprise Communications Server Release 8.2
Overview
555-233-002
Issue 1
April 2000
System Management Features
83
Trunk Management
Digital Multiplexed Interface
Supports two signaling techniques: bit-oriented signaling and message-oriented signaling
for direct connection to host computers.
Digital Multiplexed Interface offers two major advantages. It delivers a standard,
single-port interface for linking host computers internally and externally via T1 carrier.
And, since it is compatible with ISDN standards and is licensed to numerous equipment
manufacturers, it promotes multi-vendor connectivity.
DEFINITY ECS supports two versions of Digital Multiplexed Interface, each differing in
the way information is carried over the 24th channel:
■ Digital Multiplexed Interface-Bit-Oriented Signalling carries framing and alarm data
and signalling information for connections to host computers and other vendor
equipment.
■ Digital Multiplexed Interface Message-Oriented Signalling, fully compatible with
ISDN-PRI, uses the same message-oriented signalling format, Link Access
Procedure on the D-channel, as ISDN-PRI for control and signalling. These
signalling capabilities extend the advantages of Digital Multiplexed
Interface-Message Oriented Signalling multiplexed communications to the public
ISDN network.
Miscellaneous Trunks
Miscellaneous trunks perform functions that do not fit neatly into any of those already
described:
■ Release-link trunks are used between switch locations to provide Centralized
Attendant Service or Automatic Call Distribution group availability.
■ Remote-access trunks provide off-premises users with access to DEFINITY ECS
features and networking.
Digital Interfaces
E1 Interface
DEFINITY ECS also supports E1 connections. T1/E1 access and conversion allows
simultaneous connection to both T1 (1.544 Mbps) and E1 (2.048 Mbps) facilities (using
separate circuit packs).
233002_1.book Page 83 Monday, February 21, 2000 8:28 AM