Troubleshooting Guide

3Com 3C905B
performance
when large
files are
received.
are received.
Problem only
occurs with
standard
Microsoft NT
4.0, regardless
of service pack.
Download latest driver
from 3Com technical
support.
3Com 3C905C
Layer 2 (L2)
errors reported
on switch port
(FCS,
alignment,
CRC, and
runts), and
slow
performance
on high-speed
workstations.
Under normal
conditions, a
Catalyst that
reports
numerous L2
(physical)
errors on ports
connected to
3C905C NIC
adapters.
Load latest driver and
diagnostic tools
available from 3Com.
Test performance back-
to-back between two
PCs, and note errors
on diagnostic tools.
Errors reported, such
as transmit under-run
and receive over-run,
cause physical layers
to be reported by the
switch and minor
performance issues.
For more details, refer
to Cisco bug ID
CSCdt68700
(registered
customers
only) .
3C905CX-TX-M
The link fails to
come up when
the switch port
is hardcoded to
100 Mbps, full-
duplex or 100
Mbps, half-
duplex, and the
NIC is set to
autonegotiate.
Refer to Cisco
bug ID
CSCdz32789
(registered
customers
only) .
Upgrade to driver
version 5.4, and in the
advanced NIC
properties, set LnkChk
to enable.
3Com 3C980
Data corruption
with Novell.
—
Refer to 3Com
technical support
reference
1.0.33921641.2241835.
3Com 3C985/3C985B
Novell 5.0
issues
Refer to 3Com
technical support
reference
1.0.16744826.2027011.
3Com
3C985/3C985B
Clients are
unable to log in
or browse
server, but
pings work
correctly.
—
Refer to 3Com
technical support
reference
2.0.4428387.2305072.
3Com
3C985/3C985B
Packets larger
than Ethernet
MTU (1518
bytes) are
generated.
These packets
are noted as
giants on
Catalyst
switches.
—
Contact 3Com
technical support.
3Com 3C905C or
3C920 integrated
NIC on Dell
Dimension XPS
Network
connectivity is
dropped every
2–3 minutes or
the network
card must be
reinitialized
several times
to gain network
connectivity.
A 3C905C or
3C920
integrated NIC
on Dell
Dimension
XPS can
experience
network
connectivity
issues when
Windows 2000
is run due to a
power
management
issue.
Disable all power
management functions.
Contact Dell for details
on how to disable
power management or
for more details about
this issue. For more
documentation, refer to
3Com technical support
reference
2.0.47464140.2853794.