Hub USer Guide
4-24
C
H
A
P
T
E
R
4:
M
A
N
A
G
I
N
G
Y
O
U
R
H
U
B
U
S
I
N
G
Q
U
I
C
K
C
O
N
F
I
G
M
A
N
A
G
E
R
Figure 4-10
Network Errors Graph
FCS Errors
Shows the number of frames received
with checksum errors that do not have alignment
errors. FCS errors are most likely caused by noise on
the cable and should be a very small percentage of
the total traffic. If it is not, change the transceivers or
network adapters of devices connected to the hub to
see if this eliminates the problem. FCS errors can also
be caused by electrical interference from other
cables or machinery.
Alignment
Shows the number of frames received
with alignment errors (also known as framing errors).
Alignment errors should be a very small percentage
of the total traffic. They are likely to be caused by a
fault at the transmitting device. Locate the segment
and if there is only one transmitting device (for
example, fiber or 10BASE-T) change the transceiver
or adapter to see if this eliminates the problem.
Too Longs
Shows the number of frames received
that are greater than the maximum size permitted on
Ethernet (1518 octets).
Short Events
Shows the number of short events
received. A short event is a transmission of less than
the minimum size permitted on Ethernet (64 octets).
Short events can indicate externally generated noise
causing problems on the network.
16710.bk : MANAGING.FRM Page 24 Tuesday, October 7, 1997 11:38 AM