Programming instructions

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APPENDIX F - T1 MAINTENANCE
CLEAR T1 ERRORS
This tool allows you to clear any errors (i.e., for Hour Count only) that have been registered as described in “T1 Error
Threshold” (see page
483) and “T1 Error Seconds Total” (see page 484). After using the Clear T1 Error tool, the
contents (errors) will automatically be sent to KSU. The KSU will then clear the T1 Error Count for the specified error.
IMPORTANT!
• The PC-DBA and the switch MUST BE CONNECTED before you can complete
this task.
• It is recommended that you leave the threshold settings as is (i.e., keep the default
settings). Please contact Vertical Technical support with any questions prior to
changing this setting.
1) Connect PC-DBA to the switch.
From the PC-DBA main screen:
1) Go to MaintenanceXT1 MaintenanceXClear T1 Error to display the Clear T1 Error screen.
2) Select the appropriate errors for clearing (you can select one, several, or all of the errors in the list).
• The default is for ALL to be selected.
• The table below provides a definition for each of the possible error types.
T1 ERROR TYPES
ERROR TYPE Description
BPV (Bipolar Violation)
• Bipolar errors indicate that the system has detected electrical
noise on the receive pair from the network.
• Bipolar errors can occur frequently, even on a properly
functioning system and can occur if the network is using
B8ZS and the T1 board is not.
CRC Error Alarm Trigger
• CRC errors indicate corruption of A, B, C, and D bits for only
the ESF mode.
Slip Errors
• Slip errors indicate that the T1 board has discarded or
duplicated a received frame and the receive signal from the
network is not properly synchronized to the system.
OOF (Out of Frame)
• Loss of signal is an indication that the T1 framer is unable to
detect a received signal.
• This condition causes the system to send a blue alarm to the
network, but will not cause a blue alarm indication at the T1
board. However, this condition will immediately cause a red
alarm.
• When you see this indication, check the receive signal and
wiring. The NO SIG indicator on the T1 board also indicates
this condition.
T1 Error Types (continued on next page)