Ericsson LBI-39001 Manual del operador descargar pdf (Pagina 3)

1. OVERVIEW

This manual contains installation and maintenance information for the Enhanced Digital Access Communications System

(EDACS) Jessica Private Branch Exchange (PBX) Gateway, known simply as Jessica. Jessica is a communications gateway

that connects an EDACS radio system to the local public switched telephone network (PSTN). Jessica works as a centralized

subsystem within an EDACS Multisite Network to allow interconnect calls to the PSTN by EDACS users, as well as calls to

EDACS users from the PSTN. For calls originating from a telephone, Jessica represents a single point of entry to every site in

an EDACS network.

Jessica incorporates the Ericsson MD110 PBX. A default configuration tailored for Jessica is provided; however, those

installing Jessica must modify the MD110 configuration to meet the customer’s MD110 requirements. A questionnaire on the

MD110 (refer to Appendix A of LBI-39039) should be completed by the customer and provided to the installer of the

MD110.

Jessica provides common telephone features (such as common speed dialing) to EDACS radio users and those persons

calling into EDACS from the PSTN. Standard ringing and busy tones are incorporated on both inbound and outbound calls.

The Jessica subsystem is shown below.

6-Wire

4-Wire

Audio

Jessica

MD Terminal

RS-232

RS-422

RS-232

EDACS

System

Administrators

MD110

MUX

Interface

EDACS

T1/E1 ISDN

T1/E1 Audio

PSTN/PBX

Interface

PSTN

Extension

Interface

Extensions

EDACS

Radios

EDACS

Radio

EDACS

Multisite

Network

Modem

PSTN

PI Field Console

Figure 1 - Block Diagram of Jessica

1 2 3 4 5 6 7 8 ... 45 46

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Ericsson LBI-39001 Manual del operador Pagina 3

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