MT9074
Advance Information
Bit
Name
Functional Description
Bit
Name
Functional Description
1-0
X2, X3 These bits are transmitted on the
PCM 30 2048 kbit/sec. link in bit
3
MSN
Most Significant Signalling
Nibble. If one, the CSTo and
positions
seven
and
eight
CSTi
channel
associated
respectively, of time slot 16 of
frame zero of every multiframe.
X2 and X3 are normally set to
one. If receive channel 16 data is
to be included in the looped data
then the control bit TxCCS (Page,
Address 14H, bit 5) must be set
high, otherwise transmit signaling
data, or HOLCC data will be
placed into the outgoing channel
16 timeslot.
signalling nibbles will be valid in
the most significant portion of
each ST-BUS time slot. If zero,
the CSTo and CSTi channel
associated signalling nibbles will
be valid in the least significant
portion of each ST-BUS time slot.
2-0
- - -
Unused.
Table 83 - Interrupt and Signalling Control Word
(E1)
(Page 1, Address 14H)
Table 82 - Transmit Multiframe Alignment
Signal (E1)
(Page 1, Address 13H)
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
Bit
Name
Functional Description
7
DSToEn DSTo Enable. If zero pin DSTo is
tristate. If set, the pin DSTo is
enabled.
6
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.
6
5
CSToEn CSTo Enable. If zero pin CSTo is
tristate. If set, the pin CSTo is
enabled.
TxCCS
Transmit Common Channel
Signalling. If one, the transmit
section of the device is in common
channel signalling (CCS) mode. If
zero, it is in Channel Associated
Signalling (CAS) mode.
5
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.
4
DBNCE, Debounce Select. This bit selects
the debounce period (1 for 14
msec.; 0 for no debounce). Note:
there may be as much as 2 msec.
added to this duration because
the state change of the signalling
equipment is not synchronous
with the PCM 30 signalling
multiframe.
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.
Table 83 - Interrupt and Signalling Control Word
(E1)
(Page 1, Address 14H)
Table 84 - Coding and Loopback Control Word
(E1)
(Page 1, Address 15H)
72
MITEL [ MITEL NETWORKS CORPORATION ]
