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MT9123

Dual Voice Echo Canceller

Mitel Networks 

MT9123

Preliminary Information

C4i

F0i

F0od

0

1

2

3

4

PORT1

Rin

Sout

76 543210 76 54321076 54321076 543210

ECA

ECB

76 543210 76 54321076 54321076 543210

PORT2

Sin

76 543210 76 54321076 54321076 543210

ECA

ECB

Rout

76 543210 76 54321076 54321076 543210

outputs=High impedance

inputs = don’t care

indicates that an input channel is bypassed to an output channel

ST-BUS Mode 3 supports connection to 2B+D devices where timeslots 0 and 1 transport D and C channels and both

echo canceller I/O channels are assigned to ST-BUS timeslots 2 and 3. Both PORT1 and PORT2 must be configured in

ST-BUS Mode 3.

Figure 7 - ST-BUS 8 Bit Companded PCM I/O with D and C channels (Mode 3)

C4i

F0i

F0od

Rin

PORT1

Sout

S S S 12 11 10 9 8 7 6 5 4 3 2 1 0 S S S 12 11 10 9 8 7 6 5 4 3 2 1 0

ECA

ECB

S S S 12 11 10 9 8 7 6 5 4 3 2 1 0 S S S 12 11 10 9 8 7 6 5 4 3 2 1 0

Sin

PORT2

Rout

S S S 12 11 10 9 8 7 6 5 4 3 2 1 0 S S S 12 11 10 9 8 7 6 5 4 3 2 1 0

ECA

ECB

S S S 12 11 10 9 8 7 6 5 4 3 2 1 0 S S S 12 11 10 9 8 7 6 5 4 3 2 1 0

outputs=High impedance

inputs = don’t care

ST-BUS Mode 4 allows 16 bits 2’s complement linear data to be transferred using ST-BUS I/O timing. Note that PORT1

and PORT2 need not necessarily both be in mode 4.

Figure 8 - ST-BUS 16 Bit 2’s complement linear PCM I/O (Mode 4)

8-58

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