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Advance Data Sheet
T7633 Dual T1/E1 3.3 V Short-Haul Terminator
May 1998
66
Lucent Technologies Inc.
Frame Formats
(continued)
CEPT 2.048 Basic Frame, CRC-4 Time Slot 0, and Signaling Time Slot 16 Multiframe Struc-
tures
As defined in ITU Rec. G.704, the CEPT 2.048 frame, CRC-4 multiframe, and channel associated signaling multi-
frame structures are illustrated in Figure 23.
5-4548(F).cr.1
Figure 23. ITU 2.048 Basic Frame, CRC-4 Multiframe, and Channel Associated Signaling Multiframe
Structures
0 1 A S
A4
S
A5
S
A6
S
A7
S
A8
C
2
0 0 1 1 0 1 1
0 1 A S
A4
S
A5
S
A6
S
A7
S
A8
C
3
0 0 1 1 0 1 1
1 1 A S
A4
S
A5
S
A6
S
A7
S
A8
C
4
0 0 1 1 0 1 1
0 1 A S
A4
S
A5
S
A6
S
A7
S
A8
C
1
0 0 1 1 0 1 1
1 1 A S
A4
S
A5
S
A6
S
A7
S
A8
C
2
0 0 1 1 0 1 1
1 1 A S
A4
S
A5
S
A6
S
A7
S
A8
C
3
0 0 1 1 0 1 1
E 1 A S
A4
S
A5
S
A6
S
A7
S
A8
C
4
0 0 1 1 0 1 1
E 1 A S
A4
S
A5
S
A6
S
A7
S
A8
C
1
0 0 1 1 0 1 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 1
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
TIME SLOT 31
FRAME 0 OF CRC-4
MULTIFRAME
TIME SLOT 0
TIME SLOT 1
TIME SLOT 16
TIME SLOT 31
Si 1 A S
A4
S
A5
S
A6
S
A7
S
A8
TIME SLOT 1
TIME SLOT 31
Si 0 0 1 1 0 1 1
TIME SLOT 1
TIME SLOT 31
FRAME 15 OF CRC-4
MULTIFRAME
FAS FRAME
NOT FAS FRAME
0 0 0 0 X
0
Y
M
X
1
X
2
1
2
3
4
5
6
7
8
8-bit TIME SLOT = 3.90625
μ
s
256-bit FRAME = 125
μ
s
PRIMARY BASIC FRAME
STRUCTURE
A
1
B
1
C
1
D
1
A
16
B
16
C
16
D
16
A
2
B
2
C
2
D
2
A
17
B
17
C
17
D
17
A
3
B
3
C
3
D
3
A
18
B
18
C
18
D
18
A
4
B
4
C
4
D
4
A
19
B
19
C
19
D
19
A
5
B
5
C
5
D
5
A
20
B
20
C
20
D
20
A
6
B
6
C
6
D
6
A
21
B
21
C
21
D
21
A
7
B
7
C
7
D
7
A
22
B
22
C
22
D
22
A
8
B
8
C
8
D
8
A
23
B
23
C
23
D
23
A
9
B
9
C
9
D
9
A
24
B
24
C
24
D
24
A
10
B
10
C
10
D
10
A
25
B
25
C
25
D
25
A
11
B
11
C
11
D
11
A
26
B
26
C
26
D
26
A
12
B
12
C
12
D
12
A
27
B
27
C
27
D
27
A
13
B
13
C
13
D
13
A
28
B
28
C
28
D
28
A
14
B
14
C
14
D
14
A
29
B
29
C
29
D
29
A
15
B
15
C
15
D
15
A
30
B
30
C
30
D
30
FRAME 0 TIME
SLOT 16
MULTIFRAME
CHANNEL ASSOCIATED
SIGNALING MULTIFRAME
IN TIME SLOT 16
CHANNEL NUMBERS REFER TO TELEPHONE
CHANNEL NUMBERS. TIME SLOTS 1 TO 15 AND
17 TO 31 ARE ASSIGNED TO TELEPHONE
CHANNELS NUMBERED FROM 1 TO 30.
FRAME 15
TIME SLOT 16
MULTIFRAME
CRC-4 MULTIFRAME IN
TIME SLOT 0