Displaying System Information
4-23
9121-A2-GB20-20
May 1998
Network Physical Performance Statistics
For the network physical performance statistics, these additional metrics are kept
for each 15-minute interval over the past 24-hour period. A Telco set and a user
set are kept for each metric. The user set is generally a copy of the Telco set, but
the user set can be cleared.
You can collect the following metrics for the Network physical interface:
Statistic
What It Indicates
Errored Seconds (ES)
Any second with one or more ESF Error events.
Unavailable Seconds
(UAS)
Any second in which service is unavailable.
Severely Errored
Seconds (SES)
Any second with 320 or more CRC errors or one or more
Out Of Frame (OOF) events.
Bursty Errored
Seconds (BES)
Any second with 320 or more CRC errors or one or more
Out Of Frame (OOF) events.
Controlled Slip
Seconds (CSS)
Any second with one or more controlled slips (a replication or
deletion of a DS1 frame by the receiving device). This is
collected for network performance statistics only.
Loss of Frame Count
(LOFC)
The number of Loss of Frame conditions.
In addition to the metrics kept for the Network physical interface, the value of the
Status Event Register is kept for each 15-minute interval (user count only). The
system records the occurrence of the following events:
H
Yellow Alarm
H
Loss of Signal
H
Excessive Error Rate
H
Frame Synchronization Bit Error
H
Line Code Violation
NOTE:
Network performance statistics are only available for those interfaces using
ESF framing. Verify that the Line Framing Format field on the Network
Physical Options screen is set to ESF (Path: main/config/network/physical).
To help you in selecting trouble spots, a Worst Interval is displayed on Line 18.
The Worst Interval contains the largest number of seconds for either ES, UAS,
SES, BES, or CSS, or the greatest Loss of Frame Count (LOFC). If more than
one interval contains the same worst value, then the oldest interval is displayed.
