Viewing The Event Log - Black Box Echo Series User Manual

Each entry on a page represents a summary of link performance over 15 minutes of operation.
The Current entry, is updated every 10 seconds with any errors identified in the preceding
10 seconds.
To view additional entries not shown (if any) on the current screen page, move the cursor to
the 'Period end' field, and use the Left and Right arrow keys. This will scroll the statistics
information up or down by one page respectively.
For diagnostics purposes it is possible to Clear the Current line (ie start a fresh line), by
moving the cursor to the 'Period end' field, then typing <CTRL> and R. This is useful if the
operator wishes to check that a condition which may have been causing errors has been
removed.
On the screen display, the following abbreviations are used:
BVC
BER
CRC
FEBE
FAS
SYNC
These statistics provide a very useful summary of link performance over the last 24 Hour
period.
Note that, unlike the event log, the statistics are not retained in the event of a power failure.

Viewing the Event Log

An event log is maintained which stores (in non-volatile memory) crucial events, such as
power up, alarms, and configuration change, and carrier loss times.
It is also possible to enable channel related events, (such as loss of external channel clock) to
be logged. These are enabled on the System Alarms page (see later).
= Bipolar Violation Count errors
= Approximate Bit Error Rate (based on BVC), which may be used
to trigger an alarm. Note that BER is only calculated when the
unit is in SYNC with the remote unit.
= Cyclic Redundancy Check errors (in CRC4 mode only, otherwise
shown as '----')
= Far End Block Errors (in CRC4 mode only otherwise shown as '--
--')
= Frame Alignment Signal losses
= Synchronisation losses (reported each time sync goes from
'present' to 'lost')
Echo 2 Mbps Multiplexer
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