MT9074AL Zarlink Semiconductor, Inc., MT9074AL Datasheet - Page 84

• Manufacturer Part Number: MT9074AL
• Description: T1/E1/J1 Single Chip Transceiver
• Manufacturer: Zarlink Semiconductor, Inc.

MT9074
84
Bit
7
6
5
4
3
2
1
0
Table 103 - Synchronization Status Word
MFSYNC Receive Multiframe Alignment.
CRCSYN Receive CRC-4 Synchronization.
CRCIWK CRC-4
CRCRF CRC-4 Reframe. A one indicates
Name
SYNC
REB1
REB2
RED
(Page 3, Address 10H) (E1)
Receive Basic Frame Alignment.
SYNC indicates the basic frame
alignment status (1 - loss; 0 -
acquired).
MFSYNC indicates the multiframe
alignment status (1 - loss; 0 -
acquired).
CRCSYN
multiframe alignment status (1 -
loss; 0 - acquired).
Receive E-Bit One Status. REB1
indicates the status of the received
E1 bit of the last multiframe.
Receive E-Bit Two Status. REB2
indicates the status of the received
E2 bit of the last multiframe.
that the receive CRC-4 multiframe
synchronization could not be found
within the time out period of 8 msec.
after
synchronization. This will force a
reframe when the maintenance
option is selected and automatic
CRC-4 interworking is de-selected.
RED Alarm. RED goes high when
basic frame alignment has been lost
for at least 100 msec. This bit will be
low when basic frame alignment is
acquired (I.431).
indicates the CRC-4 interworking
status (1 - CRC-to-CRC; 0 - CRC-
to-non-CRC).
Functional Description
detecting
Interworking.
indicates
basic
the
CRCIWK
CRC-4
frame
Bit
7
6
5
4
3
2
(Page 3, Address 11H) (continued) (E1)
CRCS1
CRCS2
AIS16S
RFAIL
Name
LOSS
AISS
Table 104 - Alarm Status Word 1
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.
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.
Remote
Generator/Detector
one, then 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.
Loss of Signal Status. If one,
indicates the presence of a loss of
signal condition. If zero, indicates
normal operation. A loss of signal
condition
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 192 contiguous
pulse positions starting with a
pulse.
Alarm
Status. If one, indicates an all
ones alarm is being received in
channel
operation. Updated on a frame
basis.
Alarm Indication Status Signal.
If one, indicates that a valid AIS
or
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.
all
Functional Description
ones
Indication
16.
CRC-4
occurs
If
signal
Data Sheet
zero,
when
Signal
Failure.
Multiframe
is
normal
being
192
16
If