Installation guide

Page 4-7
Diagnostics
Collisions
❏ Collisions are normal events
on Ethernet networks. They
are a problem only if they
become excessive.
❏ If the collision rate of a port
exceeds five percent, the
port should be disabled.
❏ The network card attached
to the port should be
replaced.
❏ The repeater hardware auto-
matically isolates (parti-
tions) ports that cause 30
consecutive collisions.
❏ If the collision rate of a port
exceeds 5% of the packet
rate, it might indicate a
problem.
Late Events (Late Collisions)
❏ Late events should never
occur. They are collisions
that have violated the Ether-
net specification. They can
be caused by a faulty net-
work card or an improperly
configured network (more
than three repeaters/hubs
in a series between any two
nodes on the network).
❏ Check network configura-
tion.
❏ Check cable length.
❏ If your network is config-
ured properly, disable the
port and replace the net-
work card for the con-
nected station.
Date Rate Mismatches
❏ Date rate mismatches are
usually caused by an out-of-
specification oscillator on
the hub or network card
attached to the port.
❏ If all (or a number of) ports
report data rate mis-
matches, the hub card con-
tains a faulty oscillator.
Replace the hub.
❏ If only one port is reporting
this condition, disable the
port and replace the net-
work card in the connected
station.
Error Type/Cause Solution (Options or Steps)