參數(shù)資料
型號: T7698
廠商: Lineage Power
英文描述: Quad T1/E1 Line Interface and Octal T1/E1 Monitor(四T1/E1線接口和八T1/E1監(jiān)控器)
中文描述: 四T1/E1線路接口和八路的T1/E1監(jiān)視器(四個T1/E1線接口和八T1/E1的監(jiān)控器)
文件頁數(shù): 54/112頁
文件大?。?/td> 1359K
代理商: T7698
Data Sheet
January 1999
T7698 Quad T1/E1 Line Interface and Octal T1/E1 Monitor
54
Lucent Technologies Inc.
Frame Monitors
(continued)
Frame Formats
(continued)
Extended Superframe.
The extended superframe format consists of 24 DS1 frames. The frame bits are used for
frame and superframe alignment (FE), error checking (CRC-6), and facility data link transport (DL). Table 32 shows
the ESF framing bit format.
Table 32. Extended Superframe (ESF) Structure
Notes:
Frame 1 is transmitted first.
The C
1
to C
6
bits are the cyclic redundancy checksum (CRC-6) bits calculated over the previous extended superframe.
The remote alarm is a repeated 1111111100000000 pattern in the DL when enabled.
The ESF format allows for nondisruptive error detection, monitoring, and diagnostics on T1 circuits. ESF format
consist of 24 framing bits: 6 FE bits for framing synchronization (2 kbits/s); 6 CRC-6 bits for error detection
(2 kbits/s); and 12 DL bits for in-service monitoring and diagnostics (4 kbits/s). Cyclic redundancy checking is per-
formed over the entire 4632-bit ESF frame (all 24 framing bits are set to 1 during calculations).
Frame Bit
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
Bit
Number
0
193
386
579
772
965
1158
1351
1544
1737
1930
2123
2316
2509
2702
2895
3088
3281
3474
3667
3860
4053
4246
4439
FE
DL
CRC-6
0
0
1
0
1
1
D
D
D
D
D
D
D
D
D
D
D
D
C
1
C
2
C
3
C
4
C
5
C
6
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