
Preliminary Information
MT9071
121
9
CSIGEN
(0)
Common Channel Signaling Enable. Setting this bit enables common channel Signaling.
See Table 100 - T1 CCS Map Control - R/W Address Y0B for the mapping between the
CST and PCM streams.
Robbed Bit Signaling Enable.
Setting this bit multiplexes the AB or ABCD signaling bits
into bit position 8 of all DS0 channels of every 6th frame; providing the control register bit
CC detailed in Table 166 - T1 Per Channel 1 to 24 Control Registers - R/W Address Y90-
YA7 is not set.
Not Used
Receive Signaling Debounce.
Setting this bit causes incoming signaling bits to be
debounced for a period of 6 to 9 milliseconds before reporting on CSTo streams or in the
receive signaling data registers see Table 164 - T1 Receive CAS Data Registers - R Address
Y70-Y87.
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.
Not Used
Signaling Message.
These two bits are used to fill the vacant bit positions available on CSTo
when the device is operating on a D4 trunk. The first two bits of each reporting nibble of CST
contain the AB signaling bits. The last two will contain SM1 and SM0 (in that order). When the
device is connected to ESF trunks, four signaling bits (ABCD) are reported and the bits SM1-0
are unusable.
Signaling Interrupt Period.
These two bits determine the update interval of the signaling
interrupt bit CASRI detailed in Table 151 - T1 Receive Line and Timer Interrupt Status - R
Address Y35.
SIP1
SIP0
Function
0
0
1 msec period
0
1
4 msec period
1
0
8 msec period
1
1
16 msec period
Table 86 - T1 Signaling Control - R/W Address Y04
8
RBEN
(0)
7
6
(#)
RSDB
(0)
5
RFL
(0)
(#)
SM1
SM0
(00)
4
3
2
1-0
SIP1
SIP0
Bit
Name
Functional Description
15-2 (#### #### #### ##) Not Used
1-0
SIP1
SIP0
Signaling Interrupt Period.
These two bits determine the update interval of the
signaling interrupt bit CASRI detailed in Table 154 - E1 National Interrupt Status - R
Address Y36.
SIP1
SIP0
Function
0
0
1 msec period
0
1
4 msec period
1
0
8 msec period
1
1
16 msec period
Table 87 - E1 Signaling Control - R/W Address Y04
Bit
Name
Functional Description
15-6 (#### #### ##) Not Used
5
DLBK
(0)
Digital Loopback.
If one, all timeslots of DSTi are connected to DSTo at the framer to LIU
interface point of the selected framer (Y). If zero, this feature is disabled. See Section 15.0
Loopbacks.
Table 88 - T1 LoopBack Control - R/W Address Y05
Bit
Name
Functional Description