mt9074ap1 Zarlink Semiconductor, mt9074ap1 Datasheet - Page 108

• Manufacturer Part Number: mt9074ap1
• Description: T1/e1/j1 Single Chip Transceiver With Wide Dynamic Range Liu
• Manufacturer: Zarlink Semiconductor

Bit
7
6
5
4
3
2
1
0
Name
1SEC
CALN
KLVE
2SEC
400T
T1
T2
--
One Second Timer Status. This bit changes state once every 0.5 second and
is synchronous with the 2SEC timer.
Two Second Timer Status. This bit changes state once every second and is
synchronous with the 1SEC timer.
400 msec. Timer Status. This bit changes state when the 400 msec. CRC-4
multiframe alignment timer expires.
Unused.
CRC-4 Alignment. This bit changes state every msec. When CRC-4 multiframe
alignment has been achieved state changes of this bit are synchronous with the
receive CRC-4 synchronization signal.
Keep Alive. This bit is high when the AIS status bit has been high for at least
100msec. This bit will be low when AIS goes low (I.431).
Timer One. This bit will be high upon loss of terminal frame synchronization
persisting for 100 msec. This bit shall be low when T2 becomes high. Refer to
I.431 Section 5.9.2.2.3.
Timer Two. This bit will be high when the MT9074 acquires terminal frame
synchronization persisting for 10 msec. This bit shall be low when non-normal
operational frames are received. I.431 Section 5.9.2.2.3.
Table 105 - Timer Status Word
(Page 3, Address 12H) (E1)
Zarlink Semiconductor Inc.
MT9074
108
Functional Description
Data Sheet