peb2255 Infineon Technologies Corporation, peb2255 Datasheet - Page 142

• Manufacturer Part Number: peb2255
• Description: E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
• Manufacturer: Infineon Technologies Corporation

5.4.5
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 35
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
5.4.5.1
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 lead to the asynchronous state:
• two errors within 4/5 framing bits
Data Sheet
Extended Superframe (F24 or ESF Format, T1/J1)
Synchronization Procedures
Extended Superframe Structure (F24, ESF; T1/J1)
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
Table 35
FAS
–
–
–
0
–
–
–
0
–
–
–
1
–
–
–
0
–
–
–
1
–
–
–
1
on page 142.
F Bits
142
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
FALC-LH V1.3
Signaling
Channel
Designation
A
B
C
D
PEB 2255
2000-07