MT9079 Просмотр технического описания (PDF) - Mitel Networks

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Компоненты Описание

производитель

MT9079

CMOS ST-BUS™ FAMILY Advanced Controller for E1

Mitel Networks 

MT9079

Out of synchronization

>914 CRC errors

in one second

YES

NO

Search for primary basic

frame alignment signal

RAI=1, Es=0.

YES

NO

Verify Bit 2 of non-frame

alignment signal.

3 consecutive

incorrect frame

alignment

signals

YES

No CRC

multiframe alignment.

8 msec. timer expired*

Verify second occurrence

NO

of frame alignment signal.

YES

CRC-4 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.

CRC-4 multi-frame alignment

Start 400 msec timer.

Note 7.

Search for multiframe

alignment signal.

Note 7.

Start 8 msec timer.

NO

Basic frame

alignment

acquired

Note 7.

Basic frame

alignment acquired

No CRC

multiframe

NO

alignment.

Find two CRC frame

alignment signals.

8 msec. timer expired*

No CRC

multiframe

Note 7.

alignment.

CRC multiframe

alignment

8 msec.

timer expired**

Multiframe synchronization

acquired as per G.732.

Note 7.

YES

Check for two consecutive errored

multiframe alignment signals.

Notes 7 & 8.

YES

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.

Parallel search for new basic frame

alignment signal.

Notes 6 & 7.

400 msec timer expired

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.

* only if CRC-4 synchronization is selected and automatic CRC-4 interworking is de-selected.

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

Figure 6 - Synchronization State Diagram

4-250

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