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Transmission Interface Handling DS1 1544 kbit/s
Table 183
Frame
number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1)
No channel associated signalling, only T-column applicable. 8 traffic
bits in every frame.
Frame 1
Frames 6, 12, 18 and 24
FPS
DL
CRC
Option T
Option 2
Option 4
Option 16
424 (485)
Extended Superframe Format (ESF)
F bits
Bit
number
FPS
DL
0
-
m
193
-
-
386
-
m
579
0
-
772
-
m
965
-
-
1158
-
m
1351
0
-
1544
-
m
1737
-
-
1930
-
m
2123
1
-
2316
-
m
2509
-
-
2702
-
m
2895
0
-
3088
-
m
3281
-
-
3474
-
m
3667
1
-
3860
-
m
4053
-
-
4246
-
m
4439
1
-
Transmitted first
Denoted signalling frames
Framing Pattern Sequence (...001011...
4 kbit/s Data Link (Message bits m)
CRC-6 Cyclic Redundancy Check (Bits
C1-C6)
Traffic (Bit 8 not used for Robbed-bit
signalling)
2-State Signalling (Channel A)
4-State Signalling (Channel A and B)
16-State Signalling (Channel A, B, C and
D)
© Ericsson Radio Systems AB
— All Rights Reserved —
Bit use in each
timeslot
1)
Traffic
Sign.
CRC
-
1 - 8
-
C1
1 - 8
-
-
1 - 8
-
-
1 - 8
-
-
1 - 8
-
C2
1 - 7
8
-
1 - 8
-
-
1 - 8
-
-
1 - 8
-
C3
1 - 8
-
-
1 - 8
-
-
1 - 7
8
-
1 - 8
-
C4
1 - 8
-
-
1 - 8
-
-
1 - 8
-
-
1 - 8
-
C5
1 - 7
8
-
1 - 8
-
-
1 - 8
-
-
1 - 8
-
C6
1 - 8
-
-
1 - 8
-
-
1 - 7
8
Signalling bit use
options
1)
1)
T
2
4
16
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
A
A
A
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
A
B
B
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
A
A
C
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
A
B
D
EN/LZT 720 0008
P2A
2001-11-28
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