MT8982AC datasheet(8/14 Pages) MITEL

8 / 14 page

MT8982 ISO-CMOS

2-38

Applications

Digital Key Telephone System

Figure 5 shows a block diagram of a Digital Key

Telephone System (DKTS) implemented with the

MT8982.

This DKTS can support up to 64

connections

organized

any

combination

subscriber lines or trunks.

A very small system

consisting of six lines and one trunk can very easily

and economically be designed on one board. The

MT8982 signiﬁcantly reduces the tracking and board

space required for competitive switch matrices.

Distributed Switching System

The MT8982 can be used to distribute switching

capability in a very large system.

In Figure 6 the

MT8982 is shown with the microport in serial bus

mode. This allows the central microprocessor to set

up and tear down connections at the remote

locations by programming the remote MT8982's

through their CSTi pins. A microcontroller in each

remote switch would not be required.

Primary Rate Serial Controller

Figure 7 shows the MT8982 used in a primary rate

serial control application.

The MT8982 is used as

the control interface from a microcontroller to

MITEL’s MH89760/790 T1 Primary Rate Interfaces

using the microcontroller’s serial microport.

The

MT8982

ofﬂoads

signalling

and

trunk

control

functions from the central switch matrix leaving more

capacity for switching.

ST-BUS to GCI Conversion

The MT8982 MiniDX may be used to provide a

gateway

between

MITEL's

ST-BUS

family

components and an architecture which utilizes the

General Circuit Interface (GCI) operating at 2048

kbit/s (Figure 8). The MT8982 performs automatic

adaptation of the different frame pulse signals. The

master frame pulse to the MT8982 can be supplied

either by the ST-BUS or the GCI components. The

MT8982 will then provide either a delayed or

advanced frame pulse to the other components as

shown in Figures 9 and 10.

When an ST-BUS component is supplying the master

frame pulse (F0i), the MiniDX will supply the output

frame pulse (F0o) delayed by ﬁve channels.

This

ensures that frame integrity is maintained between

the ST-BUS and GCI components.

When a GCI

component supplies the master frame pulse (F0i),

F0o is advanced by ﬁve channels.

Figure 8 shows a block diagram of a GCI to ST-BUS

conversion circuit. External inversion of the clock

signal is required between the ST-BUS and GCI

components because the ST-BUS and GCI master

C4 clocks use different edges to mark bit boundaries.

To program a connection between a ST-BUS channel

and a GCI channel, some channel conversion is

necessary.

Figure

shows

the

relationship

between the ST-BUS

basic access frame and the

GCI basic access frame. Because the MT8982 shifts

the GCI frame pulse (input or output) by ﬁve

channels,

all

the

GCI

channels

must

incremented by ﬁve to be correctly addressed by the

Figure 5 - Digital Key Telephone System (DKTS)

MT8972

DNIC

MT8972

DNIC

MT8972

DNIC

MT8982

MiniDx

MH88630/1

C.O. Trunk

Central

Ofﬁce

Microcontroller

•

CENTRAL DKTS CONTROLLER

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