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(gè)T1/E1線接口和八T1/E1的監(jiān)控器）
文件頁數(shù)： 65/112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
65
Lucent Technologies Inc.
Frame Monitors
(continued)
Frame Formats
(continued)
5-3909(F).cr.3
Figure 21. CEPT Loss of CRC-4 Multiframe Alignment Recovery Algorithms:
T7698 Receive CRC-4 Multiframe Search Algorithm for Automatic, CRC-4/
Non-CRC-4 Equipment Interworking as Defined by ITU
(from ITU Rec. G.706, Annex B.2.2 - 1991)
OUT OF PRIMARY BFA:
INHIBIT INCOMING CRC-4 PERFORMANCE MONITORING
RESET ALL TIMERS
BFA SEARCH
IN PRIMARY BFA:
START 400 ms TIMER
ENABLE PRIMARY BFA LOSS CHECKING PROCESS
CRC-4 MFA SEARCH (ITU REC. G.706, SECTION 4.2)
CAN CRC-4
MFA BE FOUND
IN 8 ms
PARALLEL
BFA SEARCH
GOOD
400 ms
TIMER
ELAPSED
YES
NO
NO
NO
YES
YES (START 8 ms TIMER)
ASSUME CRC-4-TO-CRC-4 INTERWORKING:
CONFIRM PRIMARY BFA ASSOCIATED WITH CRC-4 MFA
ADJUST PRIMARY BFA IF NECESSARY
START CRC-4 PERFORMANCE MONITORING
CRC-4
ERROR COUNT > 914
OR LFA
CONTINUE CRC-4 PERFORMANCE MONITORING
YES
YES
NO
NO
ASSUME CRC-4-TO-NON-CRC-4 INTERWORKING:
CONFIRM PRIMARY BFA
SET INTERNAL 400 ms TIMER EXPIRATION STATUS BIT TO 1
PRIMARY
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