
Preliminary Information
MT9071
173
2
T2M
(0)
Timer 2 Mask.
This is the mask bit for the corresponding T2I bit in the E1 National Interrupt
Status - R Address Y36. If this mask bit is one, the interrupt bit will remain inactive. If this mask
bit is zero, the interrupt bit will function normally.
Timer 1 Mask.
This is the mask bit for the corresponding T1I bit in the E1 National Interrupt
Status - R Address Y36. If this mask bit is one, the interrupt bit will remain inactive. If this mask
bit is zero, the interrupt bit will function normally.
One Second Timer Status Mask.
This is the mask bit for the corresponding ONESECI bit in
the E1 National Interrupt Status - R Address Y36. If this mask bit is one, the interrupt bit will
remain inactive. If this mask bit is zero, the interrupt bit will function normally.
Table 161 - E1 National Interrupt Mask - R/W Address Y46
1
T1M
(0)
0
ONESEC
M
(0)
Bit
Name
Functional Description
15-4 (#### #### ####) Not Used
3
TA(n)
(#)
Transmit Channel Associated Signaling (CAS) Bit A for Channel 1 to 24.
Address Y50 to Y67 correspond to n=1 to n=24 which correspond to channel 1 to 24
and the corresponding TA bit is transmitted on the DS1 link in bit position 8 of the 6th
DS1 frame (within the 12 frame superframe structure for D4 superframes and the 24
frame structure for ESF superframes).
Transmit Channel Associated Signaling (CAS) Bit B for Channel 1 to 24.
Address Y50 to Y67 correspond to n=1 to n=24 which correspond to channel 1 to 24
and the corresponding TB bit is transmitted on the DS1 link in bit position 8 of the 12th
DS1 frame (within the 12 frame superframe structure for D4 superframes and the 24
frame structure for ESF superframes).
Transmit Channel Associated Signaling (CAS) Bit C for Channel 1 to 24.
Address Y50 to Y67 correspond to n=1 to n=24 which correspond to channel 1 to 24
and the corresponding TC bit is transmitted on the DS1 link in bit position 8 of the 18th
DS1 frame within the 24 frame structure for ESF superframes. These bits are not used
in D4 mode.
Transmit Channel Associated Signaling (CAS) Bit D for Channel 1 to 24.
Address Y50 to Y67 correspond to n=1 to n=24 which correspond to channel 1 to 24
and the corresponding TD bit is transmitted on the DS1 link in bit position 8 of the 24th
DS1 frame within the 24 frame structure for ESF superframes. These bits are not used
in D4 mode.
2
TB(n)
(#)
1
TC(n)
(#)
0
TD(n)
(#)
For CAS operation, the robbed bit enable control register bit RBEN (see Table 86 - T1 Signaling Control - R/W Address Y04) must be
set to one. In addition, CAS operation must be enabled on a per channel basis by setting the clear channel per timelsot control
register bit CC (see Table 166 - T1 Per Channel 1 to 24 Control Registers - R/W Address Y90-YA7) to zero.
Refer to 10.1 T1 CAS.
Table 162 - T1 Transmit CAS Data Registers - R/W Address Y50-Y67
Bit
Name
Functional Description