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Alarm Status
137
Model 6511RC Switch Matrix Administrators’ Reference Guide
15 • SDH
Section LOF
A section LOF failure is declared when the LOF defect persists for a period of 2.5 seconds, except when an
LOS defect or failure is present. The LOF failure is cleared when the LOS failure is declared, or when the LOF
defect is absent for 10 seconds. To display SDH Configuration and status page on the 6511RC s Configuration
Menu pane, click the SDH Link hyperlink.
Line status alarm
When an alarm is present in the SDH Line, the icon will change from green to red. Clicking on the icon takes
the user to the SDH Line STATUS ALARMS page (see
figure 74
). A Line alarm is activated upon detection of a
Line AIS (alarm indication signal), Line RDI (remote defect indication), or a Section Trace Mismatch.
Figure 74. SDH Line STATUS ALARMS window
Line AIS
Line AIS defect is detected as a “111” pattern in bits 6, 7, and 8 of the K2 byte in five consecutive frames. Line
AIS defect is terminated when bits 6, 7, and 8 of the K2 byte do not contain the code “111” for five consecu-
tive frames. A Line AIS failure is declared when the Line AIS defect persists for a period of 20.5 seconds. A
Line AIS failure is cleared when the Line AIS defect is absent for 10 seconds.
Line RDI
Line RDI defect is a “110” code in bits 6, 7, and 8 of the K2 byte of in STS-1 #1 in five consecutive frames.
Line RDI defect is terminated when any code other than “110” is detected in bits 6, 7, and 8 of the K2 byte in
five consecutive frames. A alarm is declared when the incoming Line RDI defects lasts for 2.5 seconds. The
alarm failure is cleared when no Line RDI defects are detected for 10 seconds.
Section Trace Mismatch
The Section Trace Mismatch alarm is activated when the section trace message received does not match the
configured message.
Summary of Contents for 6511RC
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Page 102: ...11 SNMP Model 6511RC Matrix Switch Administrators Reference Guide 92 SNMP window...
Page 158: ...15 SDH Model 6511RC Switch Matrix Administrators Reference Guide 148 SDH Configuration link...