Instruction manual

DEFINITY® Business Communications System and GuestWorks® Issue 6

Overview

555-231-208

Issue 1

April 2000

Introduction

2-21Connections to the system

Telephone connections

All signals between analog telephones and the system are in analog form over a

pair of wires. Digital telephones (such as the 6400-series telephones) using the

Digital Communications Protocol (DCP) employ digital transmission for integrated

voice and data signals and control signals. Transmission is over a connection

consisting of one or two pairs of wires. Each connection supports one signaling

channel and two information (voice and data) channels.

Like the digital DCP telephones, ISDN telephones transmit voice, data, and con-

trol signals digitally. With the ISDN telephones however, the transmission employs

the worldwide standard BRI protocol between the system and the telephone.

Network connections

Lucent Technologies is the first vendor to provide compatibility with the QSIG

global networking protocol. This means you can connect the system with other

switches throughout the world. QSIG Global Networking was developed to comply

with the QSIG standards developed by the European Computer Manufacturer’s

Association and the International Standardization Organization. It supports the

ISDN-PRI connection from system to system as long as both systems support the

same protocol.

The system supports both E1 and DS1 facilities. As industry standards around the

world, E1 and DS1 provide the latest alternative to analog trunking. T1/E1 access

and conversion allows simultaneous connection to both T1 (1.544 Mbps)

and E1 (2.048 Mbps).

The system’s support of ISDN-PRI, ISDN-Basic Rate Interface, and available pub-

lic network services means that you can achieve full end-to-end ISDN connectivity

and take advantage of ISDN services and features. The system provides ISDN

support for up to 84 (R8csi), 1000 (R8s), and 7000 (R8r) telephones.

The system also supports connection to an Electronic Tandem Network. Different

Electronic Tandem Network locations are connected via analog or digital tie

trunks. For example, a Digital Signal Level 1 interface can act as a high-speed

(1.544 Mbps) digital backbone for voice and data communications between Elec-

tronic Tandem Network locations.

For more information, see Chapter 9, ‘‘Networking Solutions.’’