MT9075AP datasheet(22/78 Pages) MITEL

22 / 78 page

MT9075A

Preliminary Information

4-150

Figure 10 - Synchronization State Diagram

>914 CRC errors

in one second

3 consecutive

incorrect frame

alignment

signals

YES

CRC-to-non-CRC interworking. Maintain primary

basic frame alignment. Continue to send CRC-4

data, but stop CRC processing. E-bits set to ‘0’.

Indicate CRC-to-non-CRC operation. Note 7.

Search for primary basic frame

alignment signal RAI=1, Es=0.

Out of synchronization

Verify Bit 2 of non-frame

alignment signal.

Parallel search for new basic frame

alignment signal.

Notes 6 & 7.

YES

400 msec timer expired

CRC multiframe

alignment

* only if CRC-4 synchronization is selected and automatic CRC-4

interworking is de-selected.

** only if automatic CRC-4 interworking is selected.

8 msec.

timer expired**

CRC-to-CRC interworking. Re-align to new basic

frame alignment. Start CRC-4 processing. E-bits set

as per G.704 and I.431. Indicate CRC synchronization

achieved.

Notes 7& 8.

Signalling multi-frame alignment

Primary basic frame synchronization

acquired. Enable trafﬁc RAI=0, E’s=0. Start

loss of primary basic frame alignment

checking. Notes 7 & 8.

YES

CRC-4 multi-frame alignment

YES

Verify second occurrence of

frame alignment signal.

Start 8 msec timer.

Note 7.

Multiframe synchronization

acquired as per G.732.

Note 7.

Find two CRC frame

alignment signals.

Note 7.

Check for two consecutive errored

multiframe alignment signals.

Notes 7 & 8.

Start 400 msec timer.

Note 7.

Search for multiframe

alignment signal.

Note 7.

YES

Basic frame

alignment acquired

No CRC

multiframe

alignment.

No CRC

multiframe alignment.

8 msec. timer expired*

MT9075AP Datasheet(PDF) 22 Page - Mitel Networks Corporation

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