Appendix A
Bt8370/8375/8376
A.4 Extended Superframe Format (ESF)
Fully Integrated T1/E1 Framer and Line Interface
Table A-4. Extended Superframe Format
Bit Use in Each
Signaling Channel
Time Slot
F-Bits
DL
Frame #
Bit #
FPS
CRC
Traffic
Signal
16
4
2
1
2
0
—
—
—
0
m
—
m
—
C1
—
—
—
C2
—
—
—
C3
—
—
—
C4
—
—
—
C5
—
—
—
C6
—
—
1–8
1–8
1–8
1–8
1–8
1–7
1–8
1–8
1–8
1–8
1–8
1–7
1–8
1–8
1–8
1–8
1–8
1–7
1–8
1–8
1–8
1–8
1–8
1–7
—
—
—
—
—
8
—
—
—
—
—
A
—
—
—
—
—
A
—
—
—
—
—
A
193
3
386
4
579
—
m
5
772
—
—
—
0
6
965
—
m
7
1158
1351
1544
1737
1930
2123
2316
2509
2702
2895
3088
3281
3474
3667
3860
4053
4246
4439
—
—
—
—
—
8
—
—
—
—
—
B
—
—
—
—
—
B
—
—
—
—
—
A
8
—
m
9
—
—
—
1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Note:
—
m
—
m
—
—
—
0
—
—
—
—
—
8
—
—
—
—
—
C
—
—
—
—
—
A
—
—
—
—
—
A
—
m
—
m
—
—
—
1
—
m
—
—
—
—
—
8
—
—
—
—
—
D
—
—
—
—
—
B
—
—
—
—
—
A
—
m
—
—
—
m
1
—
1. FPS indicates the Framing Pattern Sequence (...001011...).
2. DL indicates the 4 kbps Data Link with message bits m.
3. CRC indicates the cyclic redundancy check with bits C1 to C6.
4. Signaling options include 16-state, 4-state, and 2-state.
A-6
Conexant
N8370DSE