MT9074
Advance Information
Bit
Name
Functional Description
Bit
Name
Functional Description
2
CSYN
CRC-4 Synchronization. If zero,
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 double-frame
periods (512 bits per double
frame).
basic
CRC-4
synchronization
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.
6
CRCM
CRC-4 Modification. If one
activates the CRC-4 remainder
modification function when the
device is in transparent mode. The
received CRC-4 remainder is
modified to reflect only the
changes in the transmit DL. If zero,
time slot zero data from DSTi will
not be modified in transparent
mode.
1
0
REFRM Reframe. If one for at least one
frame, and then cleared, the
device will initiate a search for a
new
basic
frame
position.
Reframing function is activated on
the one to zero transition of the
REFRM bit.
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.
5
4
AUTC
ARAI
Automatic CRC-interworking. If
zero, automatic CRC-interworking
is activated. If one
it is
Framing
detailed
deactivated.
Algorithm
See
for
a
description.
Table 79 - Mode Selection Control Word (E1)
(Page 1, Address 10H)
Automatic
Remote
Alarm
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.
Bit Name
Functional Description
Unused
7
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
and
CRC-4
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
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.
5
4
TAIS16 Transmit AIS Time Slot 16. If one, an
all ones signal is transmitted in time
slot 16. If zero, time slot functions
normally.
Multiframe
Word.
Alignment
Control
TxAO Transmit All Ones. When low, this
control bit forces an unframed all ones
to be transmit at TTIP and TRING.
Table 79 - Mode Selection Control Word (E1)
(Page 1, Address 10H)
Table 80 - Transmit Alarm Control Word (E1)
(Page 1, Address 11H)
70
MITEL [ MITEL NETWORKS CORPORATION ]
