Preliminary Information
MT9075B
2
TxTRSP Transmit Transparent Mode. If
Bit
Name
Functional Description
one, the MT9075B is in transmit
transparent mode. No framing or
signaling is imposed on the data
transmit from DSTi onto the line. If
zero, it is in termination mode.
(0)
7
TIU1
(1)
Transmit International Use One.
When CRC-4 operation is disabled
(CSYN=1), this bit is transmit on the
PCM 30 2048 kbit/sec. link in bit
position one of time-slot zero of
non-frame-alignment frames. It is
reserved for international use and
should normally be kept at one. If
CRC processing is used, i.e., CSYN
=0, this bit is ignored.
1
CSYN CRC-4 Synchronization. If zero,
basic CRC-4 synchronization
(0)
processing is activated, and TIU0
bit and TIU1 bit programming will
be overwritten. If one, CRC-4
synchronization is disabled, the
first bits of channel 0 are used as
international use bits and are
programmed by TIU0 and TIU1.
6
5
- - -
Unused. Set low for normal
operation.
TALM Transmit Remote Alarm. This bit is
0
AUTC Automatic CRC-interworking. If
transmitted on the PCM 30 2048
kbit/sec. link in bit position three (A
bit) of time slot zero of NFAS
frames. It is used to signal an alarm
to the remote end of the PCM 30
link (one - alarm, zero - normal).
This control bit is ignored when
ARAI is zero (page 01H, address
11H).
(1)
zero, automatic CRC-interworking
is activated. If one, it is deactivated.
See Framing Algorithm section for
a detail description.
(0)
Table 14 - Mode Selection Control Word
(Page 01H, Address 11H)
4 -0 TNU4-8 Transmit National Use Four to
Eight (S - S ). These bits are
(11111)
a4
a8
transmitted on the PCM 30 2048
kbit/sec. link in bit positions four to
eight of time slot zero of the NFA
frame, if selected by S
- S
a4
a8
control bits of the DL selection word
(page 01H, address 10H).
Table 15 - NFA Control Word
(page 01H, Address 12H)
31
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