MT90823AP datasheet(22/34 Pages) MITEL

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MT90823 CMOS

Wide Frame Pulse (WFP) Frame Alignment

Mode

When the device is in the wide frame pulse mode

and if the input data streams are sampled at 3/4 bit

time, the device can operate in the HMVIP and

MVIP-90 environment. When input data streams are

sampled at half-bit time as speciﬁed in the HMVIP

and MVIP-90 standard, the device can only operate

with data rate of 2 Mb/s. Refer to the ST-BUS output

delay parameter, tSOD, as speciﬁed in the AC

Electrical Characteristic table.

The MT90823 is designed to accept a common

frame pulse F0i, the 4.096 MHz and 16.384 MHz

clocks required by the HMVIP standards. To enable

the Wide Frame Pulse Frame Alignment Mode, the

WFPS pin has to be set to HIGH and the DR1 and

DR0 bits set for 8.192Mb/s data rate operation.

Digital Access Cross-Connect System

Figure 8 illustrates the use of MT90823 devices to

construct a 256 E1/T1 Digital Access Cross- connect

System (DACS). The system consists of 32 trunk

cards each having eight E1 or T1 trunk interfaces for

a total of 256 trunks. Each trunk card uses two

MT8986 Multi-rate Digital Switches. The central

switching block uses 16 MT90823 devices.

The block diagram at Figure 9 shows how an 8,192 x

8,192 channel switch can be constructed from 4,096

x 4,096 channel switch modules. Figure 6 shows the

implementation of the individual 4,096 x 4,096

channel switch modules from four MT90823 devices.

Figure 10 shows an eight-stream trunk card using

MT8986 Multi-rate Digital Switches to concentrate

32-channel 2.048 Mb/s ST-BUS (DSTi and DSTo)

streams at each E1/T1 trunk onto four 128-channel

8.192 Mb/s streams.

The DACS switching matrix that formerly required

256 MT8986 devices in a square (16 x 16)

conﬁguration can now be provided by 64 MT8986

and 16 MT90823 devices (see Figure 8).

Figure 8 - 256 E1/T1 Digital Access Cross-Connect System (DACS)

8 x E1/T1

Trunk Card

E10

E17

8 x E1/T1

Trunk Card

E18

TC1

E115

8 x E1/T1

Trunk Card

E1247

TC31

E1255

64 input streams

64 output streams

Sixteen MT90823

(8 Mb/s mode)

8,192 x 8,192 channel

Switch Matrix

(See Figure 9)

(Figure 10)

128 channels at 8.192Mb/s

Each line represents a stream

TC0

that consists of

MT90823AP Datasheet(PDF) 22 Page - Mitel Networks Corporation

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