Monitoring the DSU/CSU
4-8
7110-A2-GB20-00
June 1997
You can reset the performance registers via the ClrStats selection on the
Performance Statistics screen.
There are four sections to the Network Performance Statistics screen:
Summary Information
Interval Table
Worst Interval
24-Hour Totals
Summary Information
Summary information provides the following information:
Current Interval Timer – displays the number of seconds that have elapsed
in the current 15-minute interval.
ESF Error Events – displays the number of ESF frames with either a CRC
error or an OOF event.
The ESF Error Event statistic is
not reset every 15 minutes. If the counter
reaches 65,535, it remains at this value until reset.
The Telco counter for ESF Error Events can only be cleared by a reset
command from the network or a reset of the device itself.
The User counter for ESF Error Events can only be reset by selecting the
ClrStats option or by resetting the device.
Interval Table
Network performance statistics are kept for each 15-minute interval over the past
24-hour period.
There are six types of statistics recorded:
Errored Seconds (ES) – The number of errored seconds for the current
interval. An errored second is any second with one or more ESF error events.
The maximum is 900 seconds.
Unavailable Seconds (UAS) – The number of unavailable seconds for the
current interval. An unavailable second is any one second interval when
service is unavailable. (Detection occurs with 10 consecutive unavailable
seconds.) The maximum is 900 seconds
.
Severely Errored Seconds (SES) – The number of severely errored
seconds for the current interval. A severely errored second is any second
with 320 or more CRC errors, or any second with one or more OOF events.
The maximum is 900 seconds.
Bursty Errored Seconds (BES) –The number of bursty errored seconds for
the current interval. A bursty errored second is any second with more than
one, but less than 320, CRC errors. The maximum is 900 seconds.
