Ericsson LBI-39076B Spécifications télécharger pdf (Page 11)

DESCRIPTION LBI-39076

The Site Controller computer directs up to 16 levels of

toll call restrictions, up to 15 rotary hunt sequences, 8 de-

queuing priority levels, and inbound interconnect

enable/disable assignments, for each ID number. It also

accumulates interconnect call activity data for the System

Manager.

The standard ELI option consists of one or more GTI

units, one GTI Interface card, one set of two GTI

Configurator software diskettes, one set of two Site

Controller computer Personality PROMs, and the necessary

cables and hardware. The ELI option may also consist of an

optional Interconnect Accounting Manager (IAM) unit. The

GTI interface card is to be installed into one of the GTI units

making it the Master GTI.

The ELI option utilizes a distributed switching system

architecture that distributes the switching function between

the separate GTI units rather than concentrating it at a

centrally located telephone switch. Additionally, each GTI

unit receives its power from a separate repeater power

supply.

A typical ELI installation containing two GTI units, a

Master GTI, and an optional IAM is shown in

Figure 1. The function of each cable and bus

termination shown, is as follows (see parts list for part

numbers):

S - The serial data cables connect the Master GTI to the

Site Controller computer. (Two are used.)

P - The power cable connects the optional IAM to the

power supply of the associated repeater. (One is

used if an IAM is supplied.)

A/P - The audio/power cable connects a GTI or Master

GTI to a MASTR II/III repeater and its power

supply. (One is used for each GTI or Master GTI

assigned to a MASTR II/III repeater.)

PCM - The PCM/Data bus sections connect each GTI,

the Master GTI, and the optional IAM in a daisy-

chain. (Section lengths depend upon the position

of the units. The total number of bus sections is

one less than total number of units used.)

T - The termination for the PCM/Data bus terminates

the high channel end of the bus. (One is used.)

GTI UNITS

Each GTI (Global Telephone Interconnect) unit

contains both a radio channel interface and a telephone line

interface. For each interface, the GTI contains both analog-

to-digital and digital-to-analog converters, and a digital

signal processor. The relation of these circuits to the audio

paths is shown in

Figure 2.

The radio channel interface provides the following

functions:

• Decodes DTMF from radio for radio-originated

call.

• Sends ringback or busy tone to radio for radio-

originated call.

• Sends ringing signal to radio for telephone-

originated call.

Telephone

Interface

Repeater

Interface

CODEC

Digital/Analog

Converter

Digital/Analog

CODEC Digital

Signal

Processor

Digital

Signal

Processor

Driver

Bus

and

Receiver

PCM / Data Bus

Figure 2 - GTI Audio Paths

The telephone line interface provides the following

functions for telephone-originated calls:

• Detects signaling from telephone line.

• Applies signaling to seize telephone line.

• Detects and decodes overdialed telephone number

digits from telephone line.

• Sends voice prompts to telephone line.

• Detects end-of-call signaling from telephone line.

• Removes signaling to drop telephone line.

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Ericsson LBI-39076B Spécifications Page 11

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