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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)： | 62/112頁 |
| 文件大?。?/td> | 1359K |
| 代理商： | T7698 |
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Data Sheet
January 1999
T7698 Quad T1/E1 Line Interface and Octal T1/E1 Monitor
62
Lucent Technologies Inc.
Frame Monitors
(continued)
Frame Formats
(continued)
CEPT Loss of CRC-4 Multiframe Alignment (LMFA)
Loss of basic frame alignment forces the receive frame monitor into a loss of CRC-4 multiframe alignment state.
This state is reported by way of the status registers, and once basic frame alignment is achieved, a new search for
CRC-4 multiframe alignment is initiated. During a loss of CRC-4 multiframe alignment state:
1.
2.
The CRC-4 error counter is halted.
The CRC-4 error monitoring circuit for errored seconds, bursty errored seconds, and severely errored seconds
is halted.
The received E bit = 0 counter is halted.
The received E bit = 0 monitoring circuit for errored seconds, bursty errored seconds, and severely errored
seconds at the remote end interface is halted.
All receive Sa6 code monitoring and counting functions are halted.
Optionally, if LMFA monitoring in the performance counters is enabled (by setting bit 1 high in registers
Framer_PR4—Framer_PR7), then these counts are incremented once per second for the duration of the LMFA
state.
3.
4.
5.
6.
CEPT Loss of CRC-4 Multiframe Alignment Recovery Algorithms
Several optional algorithms exist in the receive frame monitor.
CRC-4 Multiframe Alignment Algorithm with 8 ms Timer.
The default algorithm is as described in ITU Rec.
G.706, Section 4.2. The recommendation states that if a condition of assumed frame alignment has been achieved,
CRC-4 multiframe alignment is deemed to have occurred if at least two valid CRC-4 multiframe alignment signals
can be located within 8 ms, the time separating two CRC-4 multiframe signals being 2 ms or a multiple of 2 ms. The
search for the CRC-4 multiframe alignment signal is made only in bit 1 of NOT FAS frames. If multiframe alignment
cannot be achieved within 8 ms, it is assumed that frame alignment is due to a spurious frame alignment signal and
a new parallel search for basic frame alignment is initiated. The new search for the basic frame alignment is started
at the point just after the location of the assumed spurious frame alignment signal. During this parallel search for
basic frame alignment, there is no indication to the system of a loss of frame alignment (LFA) state. The receive
frame monitor will continuously search for CRC-4 multiframe alignment if no other CRC-4 multiframe algorithm is
used.
CRC-4 Multiframe Alignment Algorithm with 100 ms Timer.
This CRC-4 multiframe reframe mode starts a
100 ms timer upon detection of basic frame alignment. This is a parallel timer to the 8 ms timer. If CRC-4 multi-
frame alignment cannot be achieved within the time limit of 100 ms, then a loss of frame alignment occurs.
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