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MT9074
Advance Information
70
Bit
Name
Functional Description
7
ASEL
AIS Select.
This bit selects the
criteria on which the detection of a
valid Alarm Indication Signal (AIS)
is based. If zero, the criteria is less
than three zeros in a two frame
period (512 bits). If one, the criteria
is less than three zeros in each of
two
consecutive
periods (512 bits per double
frame).
double-frame
6
CRCM
CRC-4
activates the CRC-4 remainder
modification function when the
device is in transparent mode. The
received CRC-4 remainder is
modified
to
reflect
changes in the transmit DL. If zero,
time slot zero data from DSTi will
not be modified in transparent
mode.
Modification.
If
one
only
the
5
AUTC
Automatic CRC-interworking.
If
zero, automatic CRC-interworking
is activated. If one it is
deactivated.
See
Algorithm
for
description.
Framing
detailed
a
4
ARAI
Automatic
Indication
. if zero, the Remote
Alarm Indication bit (the A bit) will
function automatically. That is,
RAI=1 when basic synchronization
has been acquired. And, RAI=0
when basic synchronization has
not been acquired. if one, the
remote alarm indication bit is
controlled through the TALM bit of
the transmit Non-Frame Alignment
Control Word.
Remote
Alarm
3
AUTY
Automatic Y-Bit Operation.
If
zero, the Y-bit of the transmit
multiframe alignment signal will
report the multiframe alignment
status to the far end i.e., zero -
multiframe alignment acquired,
one - lost. If one, the Y-bit is under
the manual control of the Transmit
Multiframe
Alignment
Word.
Control
Table 79 - Mode Selection Control Word (E1)
(Page 1, Address 10H)
2
CSYN
CRC-4 Synchronization.
If zero,
basic
CRC-4
processing is activated, and the
TIU0 Bit and the TIU1 bit
programming will be overwritten.
If one, CRC-4 synchronization is
disabled. If AUTC (Page 1,
Address 10H, bit 5) is also one
then the first bits of channel 0 are
used as international use bits and
are programmed by the TIU0 and
TIU1.
synchronization
1
REFRM
Reframe.
If one for at least one
frame, and then cleared, the
device will initiate a search for a
new
basic
frame
Reframing function is activated on
the one to zero transition of the
REFRM bit.
position.
0
MFRF
Multiframe Reframe.
If one, for at
least one frame, and then cleared
the MT9074 will initiate a search
for a new signalling multiframe
position. Reframing function is
activated on the one to zero
transition of the MFRM bit.
Bit
Name
Functional Description
7
- - -
Unused
6
TE
Transmit E bits.
When zero and
CRC-4 synchronization is achieved,
the E-bits transmit the received CRC-
4 comparison results to the distant
end of the link, as per G.703. That is,
when
zero
synchronization is lost, the transmit E-
bits will be zero. If one, and CRC-4
synchronization is lost the transmit E-
bits will be one.
and
CRC-4
5
TAIS16
Transmit AIS Time Slot 16
. If one, an
all ones signal is transmitted in time
slot 16. If zero, time slot functions
normally.
4
TxAO
Transmit All Ones
. When low, this
control bit forces an unframed all ones
to be transmit at TTIP and TRING.
Table 80 - Transmit Alarm Control Word (E1)
(Page 1, Address 11H)
Bit
Name
Functional Description
Table 79 - Mode Selection Control Word (E1)
(Page 1, Address 10H)