Programming instructions

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APPENDIX F - T1 MAINTENANCE
T1 ERROR THRESHOLD
You can set the number of errors (for each error type) per second that you will allow to occur before registering an error
in the total count. The total number of actual errors is the number that you can see on the Error Seconds Total screen
(see page
484) multiplied by the number that is entered on the T1 Error Threshold screen.
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:
2) Go to MaintenanceXT1 MaintenanceXT1 Error Threshold to initiate the report.
3) Enter the number of totals to be tracked before a total is registered.
4) Click Send to complete the setting.
ERROR TYPE Description
BPV (Bipolar Viola-
tion)
• 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.
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 get this indication, check the receive signal
and wiring. The NO SIG indicator on the T1 board also
indicates this condition.
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.