Lucent Technologies 8400 Digital Multiplexed Interface, Miscellaneous Trunks, Digital Interfaces

DEFINITY Enterprise Communications Server Release 8.2	Issue 1
Overview 555-233-002	April 2000
System Management Features
Trunk Management	83

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).