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Chapter 3 Installing the Switch
Connecting to 10/100 and 10/100/1000 Ports
3-20
Catalyst 2984G, 2948G-GE-TX, and 2980G Switch Hardware Installation Guide
78-6286-05
If the LEDs or the show system command indicate a power problem or other
system problem, see Appendix D, “Translated Safety Warnings” for more
information.
Connecting to 10/100 and 10/100/1000 Ports
The 10/100 ports on the Catalyst 2948G and 2980G switches configure
themselves to operate at the speed and duplex settings of attached devices. They
operate at 10 or 100 Mbps in half- or full-duplex mode. If the attached devices do
not support autonegotiation, the speed should resolve correctly. You can also
explicitly set the speed and duplex parameters.
The 10/100/1000 ports on the Catalyst 2948G-GE-TX switches configure
themselves to operate at the speed setting of attached devices. These ports operate
at 10, 100, or 1000 Mbps in full-duplex mode. If the attached devices do not
support autonegotiation, you can set the speed.
Connecting devices that do not autonegotiate or devices with manually set speed
and duplex parameters can reduce performance or result in link failures between
the devices. To maximize performance, choose one of these methods for
configuring the ports:
• Allow the ports to autonegotiate both speed and duplex for 10/100 ports and
only speed for 10/100/1000 ports.
• Set the speed and duplex parameters on both ends of the connection.
Caution To comply with the intrabuilding lightning surge requirements, intrabuilding
wiring must be shielded, and the shield for the wiring must be grounded at both
ends.
Caution To prevent electrostatic-discharge (ESD) damage, follow your normal board and
component handling procedures.