PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 252

• Manufacturer Part Number: PEB22554
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

7.7.3
The use of the first bit of each frame for the multiframe alignment word, the data link bits,
and the CRC bits is shown in table 24.
Table 24
Extended Superframe Structure
Multiframe
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
Synchronization Procedures
For multiframe synchronization the FAS bits are observed. Synchronous state is reached
if at least one framing candidate is definitely found, or the synchronizer is forced to lock
onto the next available candidate (FMR0.FRS).
In the synchronous state the framing bits (FAS bits) are observed. The following
conditions selected by FMR4.SSC1/0 will lead to the asynchronous state:
Semiconductor Group
Extended Superframe ( F24, ESF Format)
Multiframe
Bit Number
0
193
386
579
772
965
1158
1351
1544
1737
1930
2123
2316
2509
2702
2895
3088
3231
3474
3667
3860
4053
4246
4439
FAS
–
–
–
0
–
–
–
0
–
–
–
1
–
–
–
0
–
–
–
1
–
–
–
1
F Bits
252
Assignments
DL
m
–
m
–
m
–
m
–
m
–
m
–
m
–
m
–
m
–
m
–
m
–
m
–
Functional Description T1 / J1
CRC
–
e
–
–
–
e
–
–
–
e
–
–
–
e
–
–
–
e
–
–
–
e
–
–
1
2
3
4
5
6
Signaling
Channel
Designation
A
B
C
D
PEB 22554
09.98