Lucent Technologies 555-230-024 manual Trunk Group Features, DS1 Trunk Service, Isdn General

Features

Trunk Group Features

DEFINITY ECS offers an array of features for managing trunk groups efficiently.

DS1 Trunk Service

Bit-oriented signaling that multiplexes 24 channels into a single 1.544-Mbps stream. DS1 can be used for voice or voice-grade data and for data-transmission protocols. E1 trunk service is bit-oriented signaling that multiplexes 32 channels into a single 2.048-Mbps stream. Both DS1 and E1 provide a digital interface for trunk groups.

Digital Multiplexed Interface

Supports two signaling techniques: bit-oriented signaling and message-oriented signaling for direct connection to host computers.

ISDN — General

Gives you access to a variety of public and private network services and facili- ties. The ISDN standard consists of layers 1, 2, and 3 of the Open System Inter- connect (OSI) model. DEFINITY ECS can be connected to an ISDN using standard frame formats: Basic Rate Interface (BRI) and the Primary Rate Inter- face (PRI).

An ISDN provides end-to-end digital connectivity and uses a high-speed interface which provides service-independent access to switched services. Through internationally accepted standard interfaces, an ISDN provides circuit or packet-switched connectivity within a network and can link to other ISDN supported interfaces to provide national and international digital connectivity.

R6 BRI Trunk Enhancements

Adds support for public-network access outside the U.S. on point-to-midpoint connections, with the restriction that DEFINITY ECS must not be configured in a passive bus arrangement with other BRI endpoints. It will also support the use of ISDN-BRI trunks as inter-PBX tie lines using the QSIG peer protocol.

BRI: Basic Rate Interface. This standard ISDN interface consists of two 64 Kbps B-channels and one 16 Kbps D-channel.

ISDN: Integrated Services Digital Network.

NT Interface on TN556C

Support for the NT (network) side of the T interface has been added in R6 using the TN556C circuit pack, which DEFINITY R5 uses only for voice and data end- points. This gives R6 full tie trunk capability using BRI trunks. R6 supports leased

A-52Issue 5 January 1998 555-230-024