MT9075B Mitel Networks Corporation, MT9075B Datasheet - Page 44

• Manufacturer Part Number: MT9075B
• Description: E1 Single Chip Transceiver
• Manufacturer: Mitel Networks Corporation

MT9075B
44
Bit
7
6
5
4
3
2
1
0
Name
CALN
1SEC
2SEC
KLVE
400T
T1
T2
8T
Table 39 - Timer Status Word
(Page 03H, Address 12H)
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
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
terminal
persisting for 10 msec. This bit shall
be
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).
Functional Description
low
consists
the
frame
MT9075B
when
of
synchronization
non-normal
non-normal
acquires
Table 40 - Receive Non-Frame Alignment Signal
4 - 0 RNU4-8 Receive National Use Four to
Bit
7
6
5
RNFAB Receive
Name
RALM
RIU1
(Page 03H, Address 13H)
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
alignment or international use.
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
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).
Eight. These bits are received on
the PCM 30 2048 kbit/sec. link in bit
positions four to eight (the S
of the non-frame alignment signal.
Preliminary Information
Functional Description
to
for
Non-frame
differentiate
CRC-4
Alignment
multiframe
between
a
bits)