Preliminary Information
MT9075B
Bit
Name
Functional Description
Bit
Name
Functional Description
7
CRCS1 Receive CRC Error Status One. If
one, the evaluation of the last
received submultiframe 1 resulted in
an error. If zero, the last
submultiframe 1 was error free.
Updated on a submultiframe 1
basis.
1
RAIS
Remote Alarm Indication Status.
If one, there is currently a remote
alarm condition (i.e., received A bit
is one). If zero, normal operation.
Updated on a non-frame alignment
frame basis.
0
RCRS RAI and Continuous CRC Error
Status. If one, there is currently an
RAI and continuous CRC error
condition. If zero, normal operation.
Updated on a multiframe basis.
6
5
CRCS2 Receive CRC Error Status Two. If
one, the evaluation of the last
received submultiframe 2 resulted in
an error. If zero, the last
submultiframe 2 was error free.
Updated on a submultiframe 2
basis.
Table 46 - Alarm Status Word One
(Page 03H, Address 19H)
RFAIL Remote
CRC-4
Multiframe
Generator/Detector Failure. If one,
each of the previous five seconds
have an E-bit error count of greater
than 989, and for this same period
the receive RAI bit was zero (no
remote alarm), and for the same
period the SYNC bit was equal to
zero (basic frame alignment has
been maintained). If zero, indicates
normal operation.
Bit
Name
Functional Description
Bit (latched by C8S ). It is
7
S
S
a5
a5
a6
cleared once this register is read.
Sa6nibble
6-3
S
Nibble (latched by C8S ). It is
a6 a6
cleared once this register is read.
2
1
---
Unused
C8S
Eight Consecutive S
nibbles.
a6
a6
Upon detection of the eighth
consecutive S nibble with the
same pattern, this bit goes high. It is
cleared once this register is read.
4
LOSS Loss of Signal Status Indication.
If one, indicates the presence of a
loss of signal condition. If zero,
indicates normal operation. A loss
of signal condition occurs when 127
consecutive bit periods are zero. A
loss of signal condition terminates
when an average ones density of at
least 12.5% has been received over
a period of 127 contiguous pulse
positions starting with a pulse.
a6
0
CS
Changed
detection of a change of state within
the received S nibbles, this bit
S
nibble.
Upon
a6
a6
a6
goes high. It is cleared once this
register is read.
Table 47 - Changed Sa6 Report Word
(Page 03H, Address 1AH)
3
2
AIS16S Alarm Indication Signal 16
Status. If one, indicates an all ones
alarm is being received in channel
16. If zero, normal operation.
Updated on a frame basis.
Bit
Name
Functional Description
7 - 0
ID7-0 Contains device code 10101010.
Table 48 - Identification Word
(Page 03H, Address 1FH)
AISS
Alarm Indication Status Signal. If
one, indicates that a valid AIS or all
ones signal is being received. If
zero, indicates that a valid AIS
signal is not being received. The
criteria for AIS detection is
determined by the control bit ASEL
(page 01H, address 10H).
Table 46 - Alarm Status Word One
(Page 03H, Address 19H)(continued)
47
MITEL [ MITEL NETWORKS CORPORATION ]
