
MT9071
Preliminary Information
122
4
RSV
(0)
SLBK
(0)
Reserved
. Must be set to 0 for normal operation.
3
ST-BUS Loopback.
If one, the first 24 timeslots and the last bit in the frame of DSTi are
connected to DSTo on the ST-BUS side of the selected framer (Y). If zero, this feature is
disabled. See Section 15.0 Loopbacks.
Payload Loopback.
If one, all timeslots received on RTIP/RRNG are connected to TTIP/
TRNG on the ST-BUS side of the selected framer (Y). If zero, this feature is disabled. See
Section 15.0 Loopbacks.
Transmit Loop Up Code
. If this bit is set, inband line loop up code is sent. The loop up
code to be sent is determined by the TXLACL data bits detailed in Table 101 - T1 Transmit
Loop Activate Code Control - R/W Address Y0D. Note that the receiver will detect either
framed or unframed inband loop codes.
Transmit Loop Down Code
. If this bit is set, inband line loop down code is sent. The loop
down code to be sent is determined by the TXLDCL data bits detailed in Table 102 - T1
Transmit Loop Deactivate Code Control - R/W Address Y0E. Note that the receiver will
detect either framed or unframed inband loop codes.
Table 88 - T1 LoopBack Control - R/W Address Y05
2
PLBK
(0)
1
TLU
(0)
0
TLD
(0)
Bit
Name
Functional Description
15-11 (#### #) Not Used
11
RFL
(0)
10
DBNCE
(0)
Receive Signaling Freeze due to Loss.
If one, the receive signaling is frozen if a receive loss
of signal is detected. The freeze is cleared upon clearance of loss.
Debounce Select.
This bit selects the receive CAS debounce period. If one, 14 ms of debounce
is used. There may be as much as 2 ms added to this duration because the state change of the
signaling equipment is not synchronous with the PCM 30 signaling multiframe. If zero, no
debounce is used.
Not Used
Transmit Multiframe Alignment Bits One to Four.
These bits are transmitted on the PCM30
link, in the Multiframe Alignment Signal (MFAS) positions (one to four of timeslot 16) of frame
zero of every Channel Associated Signaling (CAS) multiframe. These bits are used by the far
end to identify specific frames of a CAS multiframe. TMA1-4 = 0000 for normal operation.
9-8
7
6
5
4
(##)
TMA1
TMA2
TMA3
TMA4
(0000)
X1
(1)
3
Transmit Non-Multiframe Alignment Signal (NMAS) Spare Bit.
This bit is transmitted on the
PCM30 link in bit position five of timeslot 16 of frame zero of every signaling multiframe. X1 is
normally set to one.
Transmit Remote Multiframe Alarm Signal.
This bit is transmitted on the PCM30 link in bit
position six of timeslot 16 of frame zero of every signaling multiframe when control bit AUTY (see
Table 79 - E1 Alarms and Framing Control - R/W Address Y00) is set to one. The Y bit is used to
indicate the loss of multiframe alignment to the remote end of the link. If one, loss of multiframe
alignment; if zero, multiframe alignment acquired.
Transmit Non-Multiframe Alignment Signal (NMAS) Spare Bits.
These bits are transmitted
on the PCM30 link in bit positions seven and eight respectively, of timeslot 16 of frame zero of
every signaling multiframe. X2 and X3 are normally set to one.
Table 89 - E1 CAS Control and Data - R/W Address Y05
2
Y
(1)
1
0
X2
X3
(11)
Bit
Name
Functional Description
15-12
(####)
Not Used
Table 90 - T1 HDLC & DataLink Control - R/W Address Y06
Bit
Name
Functional Description