MT8985

Data Sheet

10

Zarlink Semiconductor Inc.

Applications

Typical Exchange, PBX or Multiplexer

Figure 7 shows a typical implementation of line cards being interconnected through a central routing matrix that can

scale up in channel capacity to accommodate different number of ports depending on the application. In a

configuration where the switched services utilize concatenated or grouped time slots to carry voice, data and video

(channels of 128, 256 Kb/s, ISDN H0 and others), the central routing matrix has to guarantee constant throughput

delay to maintain the sequence integrity between input and output channels.

Figure 7 shows an example where

the MT8985 device guarantees data integrity when data flows from the T1/E1 to the S/U interface links and vice-

versa. Modern technologies available today such as Frame Relay network using dedicated fractional T1 are one of

the key applications for the MT8985 device.

Figure 7 - Typical Exchange, PBX or Multiplexer Configuration

S/U

Basic Rate Line Card

MT8930/31

MT8910

MT8972

ST-BUS

To other lines

Layers

2 & 3

Entity

MT8940/

MT8941

ROUTING

MATRIX

MT8985’s

MH89760/

MH89790

MT8920

µC

ST-BUS

ST-BUS

T1/E1

Link

To other lines

Primary Rate Card

C

P

U