Advance Information
MT9074
Bit Name
Functional Description
Bit
Name
Functional Description
5
TALM
Transmit Remote Alarm. This bit
is 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 10H).
2
RLBK Remote Loopback. If one, then all
bipolar data received on RRTIP/
RRING are directly routed to TTIP/
TRING on the PCM 30 side of the
MT9074. If zero, then this feature is
disabled.
1
0
SLBK ST-BUS Loopback. If one, then all
time slots of DSTi are connected to
DSTo on the ST-BUS side of the
MT9074. If zero, then this feature is
disabled. See Loopbacks section.
4-0
TNU4-8 Transmit National Use Four to
Eight (Sa4 - Sa8). These bits are
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 Sa4 - Sa8
control bits of the DL selection
word (page 01H, address 17H).
PLBK Payload Loopback. If one, then all
time slots received on RTIP/RRING
are connected to TTIP/TRING on the
ST-BUS side of the MT9074 (this
excludes time slot zero). If zero, then
this feature is disabled. If receive
channel 16 data is to be included in
the looped data, then the control bit
TxCCS (Page 1, Address 14H, bit 5)
must be set high, otherwise transmit
signalling data, or HDLC1 data will
be placed into the outgoing channel
16 timeslot.
Table 85 - Non Frame Alignment Control Word
(E1)
(Page 1, Address 16H)
Bit
Name
Functional Description
Unused
7
6
- - -
Table 84 - Coding and Loopback Control Word
(E1)
MFSEL Multiframe Select. This bit
determines which receive
(Page 1, Address 15H)
multiframe signal (CRC-4 or
signalling) the RxMF (pin 42 in
PLCC, 23 in MQFP) signal is
aligned with. If zero, RxMF is
aligned with the receive signalling
multiframe. If one, RxMF is aligned
Bit
Name
Functional Description
Unused.
7
6
- - -
RxNFA
Receive Non-frame Alignment
Byte. This bit decides the
contents of channel 0 of DSTo.
When RxNFA=1, channel 0 of
DSTo contains only data from the
received non frame alignment
signal (NFAS). When RxNFA = 0,
channel 0 of DSTo contains both
frame alignment and non frame
alignment bytes received with the
rest of the frame.
with
the
receive
CRC-4
multiframe.
5
- - - -
Unused
Table 86 - Multiframe and Data Link Selection
(E1)
(Page 1, Address 17H)
Table 85 - Non Frame Alignment Control Word
(E1)
(Page 1, Address 16H)
73
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