Dual-Speed Stackable Hub Web-based Management User’s Guide
Web-based Network Management
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♦
Jabber The number of packets received during this sampling interval
that were longer than 1518 octets (excluding framing bits but including
FCS octets), and had either a bad Frame Check Sequence (FCS) with an
integral number of octets (FCS Error) or a bad FCS with a non-integral
number of octets (Alignment Error). Note that this definition of jabber is
different than the definition in IEEE-802.3 section 8.2.1.5 (10BASE5)
and section 10.3.1.4 (10BASE2). These documents define jabber as the
condition where any packet exceeds 20 ms. The allowed range for jab-
ber detection in this program is between 20 ms and 150 ms.
♦
Collision The best estimate of the total number of collisions on this
Ethernet segment during this sampling interval.
♦
Utilization The best estimate of the mean physical layer network utili-
zation on this interface during this sampling interval, in hundredths of a
percent.
Alarm
The Alarm Group periodically takes statistical samples from variables in the
probe and compares them to previously configured thresholds. If the moni-
tored variable crosses a threshold, an event is generated. A hysteresis
mechanism is implemented to limit the generation of alarms. This group con-
sists of the Alarm Table and requires the implementation of the Event group.
Alarm Table
The Alarm Table consists of a list of Alarm entries containing parameters that
are set up to periodically check the network for alarm conditions.
The alarm table resides in the top half of the of the window that opens when
you click on the Alarm button, and is shown below.
