Cisco 2948G Hardware Installation Guide - Page 70

Connecting to 10/100 and 10/100/1000 Ports Chapter 3 Installing the Switch 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. 3-20 Catalyst 2984G, 2948G-GE-TX, and 2980G Switch Hardware Installation Guide 78-6286-05