MT9079 Mitel Semiconductor, MT9079 Datasheet - Page 14

• Manufacturer Part Number: MT9079
• Description: CMOS ST-BUS FAMILY Advanced Controller for E1
• Manufacturer: Mitel Semiconductor

MT9079
4-250
* only if CRC-4 synchronization is selected and automatic CRC-4 interworking is de-selected.
** only if automatic CRC-4 interworking is selected.
basic frame alignment. Start CRC-4 processing.
E-bits set as per G.704 and I.431. Indicate
CRC-to-CRC interworking. Re-align to new
CRC-4 multi-frame alignment
>914 CRC errors
in one second
CRC multiframe
alignment
CRC synchronization achieved.
No CRC
multiframe alignment.
8 msec. timer expired*
Start 400 msec timer.
Find two CRC frame
Start 8 msec timer.
alignment signals.
Notes 7& 8.
Note 7.
Note 7.
Note 7.
Figure 6 - Synchronization State Diagram
NO
alignment acquired
acquired. Enable traffic RAI=0, E’s=0. Start
loss of primary basic frame alignment
timer expired**
Primary basic frame synchronization
Basic frame
Verify Bit 2 of non-frame
of frame alignment signal.
Verify second occurrence
Search for primary basic
No CRC
multiframe
8 msec. timer expired*
frame alignment signal
8 msec.
checking. Notes 7 & 8.
alignment.
No CRC
multiframe
alignment.
Out of synchronization
alignment signal.
Basic frame
RAI=1, Es=0.
alignment
acquired
send CRC-4 data, but stop CRC processing.
primary basic frame alignment. Continue to
E-bits set to ‘0’. Indicate CRC-to-non-CRC
CRC-to-non-CRC interworking. Maintain
Parallel search for new basic frame
YES
YES
YES
YES
NO
NO
alignment signal.
operation. Note 7.
Notes 6 & 7.
Check for two consecutive errored
400 msec timer expired
multiframe alignment signals.
Multiframe synchronization
NO
acquired as per G.732.
Search for multiframe
NO
CRC-4 multi-frame alignment
alignment signal.
Notes 7 & 8.
Note 7.
Note 7.
YES
3 consecutive
incorrect frame
alignment
signals
YES