MT9076
Preliminary Information
Bit
Name
Functional Description
7
RxHDB3 High Density Bipolar 3 Encoding. If one, HDB3 encoding is enabled in the receive direction.
If zero, AMI signal without HDB3 encoding is received.
6
5
MLBK
Metallic Loopback. If one, then the external RRTIP and RRING signals are isolated from the
receiver, and TTIP and TRING are internally connected to the receiver analog input instead. If
zero, metallic loopback is disabled.
TxHDB3 High Density Bipolar 3 Encoding. If one, HDB3 encoding is enabled in the transmit
direction. If zero, AMI signal without HDB3 encoding is transmitted. HDB3 is always decoded
in the receive direction.
4
3
- - -
Unused.
DLBK
Digital Loopback. If one, then the digital stream to the transmit LIU is looped back in place of
the digital output of the receive LIU. Data coming out of DSTo will be a delayed version of
DSTi. If zero, this feature is disabled.
2
1
0
RLBK
SLBK
PLBK
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 MT9076. If zero, then this feature is disabled.
ST-BUS Loopback. If one, then all time slots of DSTi are connected to DSTo on the ST-BUS
side of the MT9076. If zero, then this feature is disabled. See Loopbacks section.
Payload Loopback. If one, then all time slots received on RTIP/RRING are connected to
TTIP/TRING on the ST-BUS side of the MT9076 (this excludes time slot zero). If zero, then
this feature is disabled.
Table 92 - Coding and Loopback Control Word (E1)
(Page 1, Address 15H)
Bit
Name
Functional Description
7 - 6
5
- - -
Unused.
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).
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 10H).
Table 93 - Non Frame Alignment Control Word (E1)
(Page 1, Address 16H)
96
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