10BASE-T Stackable Hubs
choose which to view through the Statistics menu, accessible from the
Network Monitoring menu.
Figure 6 -16 Network Monitoring Menu
The statistics shown are the same for each of these selections. The statistics
displayed are:
♦
Too Long Frame:
counts frames longer than the 1518-byte (octet)
limit set by the Ethernet standard. This is likely caused by a software
problem.
♦
Very Long Event:
counts events where a signal is received longer
than the jabber lockup protection timer (4–7.5 ms). This may indicate
noise on the line or a bad Ethernet interface.
♦
Short Event:
counts events where less than 10 bytes are received and
the frame start delimiter is invalid, or where the start frame delimiter
is valid but less than 2 bytes are received. This may indicate noise on
the line.
♦
Late Event:
counts collisions that occur at or after the 64
th
byte
(octet) in the frame. This may indicate that delays on your Ethernet
6-22
Using the Console Interface
