MT9075BP1 Zarlink, MT9075BP1 Datasheet - Page 58

• Manufacturer Part Number: MT9075BP1
• Description: PB FREE E1 SINGLE CHIP TRANSCEIVER
• Manufacturer: Zarlink

4 - 0
Bit
Bit
7
6
5
4
3
2
1
0
7
6
5
RNU4-8
RNFAB
Name
CALN
RALM
1SEC
2SEC
KLVE
Name
400T
RIU1
T1
T2
8T
Table 40 - Receive Non-Frame Alignment Signal
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.
Timer One. This bit will be high after a signal has been received, that
consists of non-normal operation frames, and persists 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 MT9075B 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.
400 msec. Timer Status. This bit changes state when the 400 msec.
CRC-4 multiframe alignment timer expires.
8 msec. Timer Status. This bit changes state when the 8 msec. CRC-4
multiframe alignment timer expires.
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 (page 03H, address
19H) has been high for at least 100msec. This bit will be low when AIS
goes low (I.431).
Receive International Use 1. This bit is received on the PCM 30 2048
kbit/sec. link in bit position one of the non-frame alignment signal. It is
used for CRC-4 multiframe alignment or international use.
Receive Non-frame Alignment Bit. This bit is received on the PCM 30
2048 kbit/sec. link in bit position two of the non-frame alignment signal.
This bit should be one in order to differentiate between frame alignment
frames and non-frame alignment frames.
Receive Alarm. This bit is received on the PCM 30 2048 kbit/sec. link in
bit position three (the A bit) of the non-frame alignment signal. It is used as
a remote alarm indication (RAI) from the far end of the PCM 30 link (1 -
alarm, 0 - normal).
Receive National Use Four to Eight. These bits are received on the
PCM 30 2048 kbit/sec. link in bit positions four to eight (the S
non-frame alignment signal.
Table 39 - Timer Status Word
(Page 03H, Address 12H)
(Page 03H, Address 13H)
Zarlink Semiconductor Inc.
MT9075B
58
Functional Description
Functional Description
a
Data Sheet
bits) of the