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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)： | 58/112頁 |
| 文件大小： | 1359K |
| 代理商： | T7698 |
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Data Sheet
January 1999
T7698 Quad T1/E1 Line Interface and Octal T1/E1 Monitor
58
Lucent Technologies Inc.
Frame Monitors
(continued)
Frame Formats
(continued)
According to the ITU Rec. G.704 Section 2.3.1, the frame length is defined to be 256 bits, numbered 1 to 256. The
frame repetition rate is 8 kHz. The allocation of bits numbered 1 to 8 of the frame is shown in Table 35.
Table 35. Allocation of Bits 1 to 8 of the FAS Frame and the NOT FAS Frame
The function of each bit in Table 35 is described below:
1.
The Si bits are reserved for international use. A specific use for these bits is described in the CRC-4 Multiframe
section. If no use is realized, these bits should be fixed at 1 on digital paths crossing an international border.
Bit 2 of the frames not containing the FAS (i.e., the NOT FAS frames) is fixed to 1 to prevent emulations of the
frame alignment signal.
Bit 3 of the NOT FAS is the remote alarm indication (A bit). In undisturbed operation, this bit is set to 0; in alarm
condition, set to 1.
Bits 4—8 of the NOT FAS may be recommended by ITU for use in specific point-to-point applications. Bit Sa4
may be used as a message-based data link for operations, maintenance, and performance monitoring.
MSB = most significant bit and is received first.
LSB = least significant bit and is received last.
2.
3.
4.
5.
6.
Basic Frames
Bit 1
(MSB)
Si
Si
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
(LSB)
1
Sa8
Frame Alignment Signal (FAS)
Not Frame Alignment Signal
0
1
0
A
1
1
0
1
Sa4
Sa5
Sa6
Sa7
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