參數(shù)資料
型號: T7230A
廠商: Lineage Power
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù): 33/110頁
文件大?。?/td> 752K
代理商: T7230A
Preliminary Data Sheet
June 1997
T7230A Primary Access Framer/Controller
29
Lucent Technologies Inc.
Frame Formats
(continued)
T1 Framing Structures
(continued)
Extended Superframe
The extended superframe format consists of 24 DS1 frames. The F bits are used for frame alignment, extended
superframe alignment, error checking, and facility data link transport. Table 13 shows the ESF frame format.
Notes:
The F bit of frame 1 is transmitted first.
Frames 6, 12, 18, and 24 contain the robbed-bit signaling information in bit 8 of each voice channel, when enabled.
Signaling option none uses bit 8 for traffic data.
The C
1
to C
6
bits are the cyclic redundancy check-6 (CRC-6) checksum bits calculated over the previous extended superframe.
The remote alarm is a repeated 0000000011111111 pattern in the DL when enabled.
The ESF format allows for nondisruptive error detection and nonservice affecting diagnostics on T1 circuits. ESF
format consists of 24 framing bits: 6 for framing synchronization (2 kbits/s); 6 for error detection (2 kbits/s); and 12
for facility data link information such as in-service monitoring and diagnostics (4 kbits/s).
Cyclic redundancy checking is performed over the entire ESF (4,632 data bits, all 24 framing bits are set to 1 dur-
ing calculations). The use of CRC-6 allows for the detection of 63 out of 64 possible errors.
Table 13. Extended Superframe (ESF) Structure
Frame Bit
Bit Use in Each Time
Slot
Traffic
Signaling Option
Frame
Number
Bit
Num-
ber
0
193
386
579
772
965
1158
1351
1544
1737
1930
2123
2316
2509
2702
2895
3088
3281
3474
3667
3860
4053
4439
FE
DL
CRC-6
Signaling
None
2-State
4-State
16-State
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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
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
8
8
8
A
A
A
A
A
B
A
B
A
B
C
D
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