參數(shù)資料
型號(hào)： T7698
廠(chǎng)商： Lineage Power
英文描述： Quad T1/E1 Line Interface and Octal T1/E1 Monitor(四T1/E1線(xiàn)接口和八T1/E1監(jiān)控器)
中文描述： 四T1/E1線(xiàn)路接口和八路的T1/E1監(jiān)視器（四個(gè)T1/E1線(xiàn)接口和八T1/E1的監(jiān)控器）
文件頁(yè)數(shù)： 59/112頁(yè)
文件大?。?/td> 1359K
代理商： T7698
Data Sheet
January 1999
T7698 Quad T1/E1 Line Interface and Octal T1/E1 Monitor
59
Lucent Technologies Inc.
Frame Monitors
(continued)
Frame Formats
(continued)
CEPT Loss of Basic Frame Alignment (LFA)
Frame alignment is assumed to be lost when:
1.
As described in ITU Rec. G.706, Section 4.1.1, three (3) consecutive incorrect frame alignment signals have
been received.
Bit 2 in time slot 0 in NOT FAS frames has been received with an error on three consecutive occasions.
Optionally, as described in ITU Rec. G.706, Section 4.3.2, by exceeding a count of 914 errored CRC-4 blocks
out of 1000, with the understanding that a count of
≥
915 errored CRC blocks indicates false frame alignment.
On demand via the control registers (by setting register Framer_PR2, bit 5 = 1).
2.
3.
4.
In the LFA state:
1.
2.
3.
4.
5.
6.
7.
No additional FAS or NOT FAS errors are processed.
The received remote frame alarm (received A bit) detection is deactivated.
All NOT FAS bit (Si bit, A bit and Sa4 to Sa8 bits) processing is halted.
Receive Sa6 code monitoring and counting is halted.
If CRC-4 is enabled, loss of CRC-4 multiframe alignment is forced.
If CRC-4 is enabled, the monitoring and processing of CRC-4 checksum errors is halted.
If CRC-4 is enabled, all monitoring and processing of received E-bit information is halted.
CEPT Loss of Frame Alignment Recovery Algorithm
The frame monitor begins the search for basic frame alignment one bit position beyond the position where the LFA
state was detected. As defined in ITU Rec. G.706, Section 4.1.2, frame alignment will be assumed to have been
recovered when the following sequence is detected:
1.
2.
For the first time, the presence of the correct frame alignment signal in frame n.
The absence of the frame alignment signal in the following frame detected by verifying that bit 2 of the basic
frame is a 1 in frame n + 1.
For the second time, the presence of the correct frame alignment in the next frame, n + 2.
3.
Failure to meet 2 or 3 above will initiate a new basic frame search in frame n + 2.
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