MT90823AP MITEL [Mitel Networks Corporation], MT90823AP Datasheet - Page 22

• Manufacturer Part Number: MT90823AP
• Description: 3V Large Digital Switch
• Manufacturer: MITEL [Mitel Networks Corporation]

MT90823
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, t
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
22
E1
E1
E1
E1
E1
E1
247
255
15
8
0
7
Trunk Card
Trunk Card
Trunk Card
(Figure 10)
8 x E1/T1
8 x E1/T1
8 x E1/T1
Figure 8 - 256 E1/T1 Digital Access Cross-Connect System (DACS)
CMOS
TC31
SOD
TC0
TC1
, as specified in the AC
Each line represents a stream
128 channels at 8.192Mb/s
64 output streams
64 input streams
that consists of
x
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).
8,192 x 8,192 channel
Sixteen MT90823
(8 Mb/s mode)
(See Figure 9)
Switch Matrix