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Advance Data Sheet
T7633 Dual T1/E1 3.3 V Short-Haul Terminator
May 1998
76
Lucent Technologies Inc.
Frame Formats
(continued)
CEPT Time Slot 16 Multiframe Structure
The T7633 supports three CEPT signaling modes: channel associated signaling (CAS) or per-channel signaling
(PSC0 and PSC1); common channel signaling (CCS) (T7230A mode)
1
; and international remote switching module
(IRSM) signaling.
1. See Lucent Technologies Microelectronics Group T7230A Primary Access Framer/Controller Preliminary Data Sheet (DS96-007TIC)
pages 49—50.
Channel Associated Signaling (CAS)
The channel associated signaling (CAS) mode utilizes time slot 16 of the FAS and NOT FAS frames. The CAS for-
mat is a multiframe consisting of 16 frames where frame 0 of the multiframe contains the multiframe alignment pat-
tern of four zeros in bits 1 through 4. Table 32 illustrates the CAS multiframe of time slot 16. The T7633 can be
programmed to force the transmitted line CAS multiframe alignment pattern to be transmitted in the FAS frame by
selecting the PCS0 option or in the NOT FAS frame by selecting the PCS1 option. Alignment of the transmitted line
CAS multiframe to the CRC-4 multiframe is arbitrary.
Table 32. ITU CEPT Time Slot 16 Channel Associated Signaling Multiframe Structure
Notes:
Frame 0 bits 1—4 define the time slot 16 multiframe alignment.
X0—X2 = time slot 16 spare bits defined in FRM_PR41 bit 0—bit 2.
Y
M
= yellow alarm, time slot 16 remote multiframe alarm (RMA) bit (1 = alarm condition).
Common Channel Signaling (T7230A Mode) (CCS)
In the common channel signaling mode, selected if FRM_PR44 bit 4 = 1, data contained in the transmit signaling
registers, FRM_TSR0—FRM_TSR31, is written transparently into time slot 16 of the transmit line bit stream. The
received signaling data from time slot 16 is stored transparently in receive signaling registers FRM_RSR0—
FRM_RSR31.
Time Slot 16
Channel
Associated
Signaling
Multiframe
Frame
Number
Bit
1
0
2
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
B
9
B
10
B
11
B
12
B
13
B
14
B
15
3
0
4
0
5
X
0
A
16
A
17
A
18
A
19
A
20
A
21
A
22
A
23
A
24
A
25
A
26
A
27
A
28
A
29
A
30
6
7
8
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Y
M
B
16
B
17
B
18
B
19
B
20
B
21
B
22
B
23
B
24
B
25
B
26
B
27
B
28
B
29
B
30
X
1
C
16
C
17
C
18
C
19
C
20
C
21
C
22
C
23
C
24
C
25
C
26
C
27
C
28
C
29
C
30
X
2
D
16
D
17
D
18
D
19
D
20
D
21
D
22
D
23
D
24
D
25
D
26
D
27
D
28
D
29
D
30
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
A
10
A
11
A
12
A
13
A
14
A
15
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
8
C
9
C
10
C
11
C
12
C
13
C
14
C
15
D
1
D
2
D
3
D
4
D
5
D
6
D
7
D
8
D
9
D
10
D
11
D
12
D
13
D
14
D
15