Connecting To 10/100 And 10/100/1000 Ports - Cisco Catalyst 2955 Hardware Installation Manual

Chapter 4 Installation in a Hazardous Environment

Connecting to 10/100 and 10/100/1000 Ports

Warning
Caution
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The 10/100 ports on the Catalyst 2955 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,
you can set the speed and duplex parameters.
The 10/100/1000 ports configure themselves to operate at the speed setting of
attached devices. These ports on the Catalyst 2955T-12 operate at either 10 or 100
Mbps in either full- or half-duplex mode or at 1000 Mbps in full-duplex mode. If
the attached devices do not support autonegotiation, you can set the speed
parameter.
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:
Let the ports autonegotiate both speed and duplex for 10/100 ports and speed
•
for 10/100/1000 ports.
Set the speed and duplex parameters on both ends of the connection.
•
Do not connect or disconnect cables to the ports while power is applied to the
switch or any device on the network because an electrical arc can occur. This
could cause an explosion in hazardous location installations. Be sure that
power is removed from the switch and cannot be accidentally be turned on, or
verify that the area is nonhazardous before proceeding. Statement 1070
Proper ESD protection is required whenever you handle Cisco equipment.
Installation and maintenance personnel should be properly grounded using
ground straps to eliminate the risk of ESD damage to the switch.
Do not touch connectors or pins on component boards. Do not touch circuit
components inside the switch. When not in use, store the equipment in
appropriate static-safe packaging.
Connecting to 10/100 and 10/100/1000 Ports
Catalyst 2955 Hardware Installation Guide
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