Tip
Problem
Solution
5
The network connection is not working properly.
Try the following procedures:
• For the indicated port, verify both ends of the
cabling, at the switch and the connected device,
are connected properly.
• Verify the connected device and switch are both
powered on and operating correctly.
• Verify you have used the correct cable type for
the connection:
◦ For twisted-pair connections to the fixed
10/100/1000 ports, if the port is configured to
“Auto” (auto negotiate), either straight-
through or crossover cables can be used
because of the switch’s “Auto-MDIX” feature
and the Auto MDI/MDI-X feature of the
10/100/1000-T port.
If the switch port configuration is
changed to one of the fixed
configuration options (for
example, 100 Mbps/Full
Duplex), then the port operates
as MDI-X only and you must
use the correct type of cable for
the connection. In general, for
connecting an end node (MDI
port) to the switch, use straight-
through cable; for connecting to
MDI-X ports on hubs, other
switches, and routers, use
crossover cable.
◦ For fiber-optic connections, verify the transmit
port on the switch is connected to the receive
port on the connected device, and the switch
receive port is connected to the transmit port
on the connected device.
• For 1000Base-T connections, verify that the
network cabling complies with the IEEE 802.3ab
standard. the cable should be installed according
to the ANSI/TIA/EIA-568-A-5 specifications.
Cable testing should comply with the stated
limitations for Attenuation, Near-End Crosstalk,
Far-End Crosstalk, Equal-Level Far-End
Crosstalk (ELFEXT), Multiple Disturber ELFEXT,
and Return Loss.
Table Continued
Chapter 4 Troubleshooting
53
