Cisco Systems OL-6157-01 manual Connecting to 10/100 Ports and the 10/100/1000 Port

Chapter 2 Installation

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

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

The 10/100 ports 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 explicitly set the speed and duplex parameters.

The 10/100/1000 port on the 2940-8TT-S operates at the speed setting of the attached device. This port operates in half- or full-duplex mode at 10 or 100 Mbps or in full-duplex mode only at 1000 Mbps. If the attached device does not support autonegotiation, you can set the speed.

Connecting a device that does not autonegotiate or a device 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 port 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.

Follow these steps to connect the switch to 10BASE-T, 100BASE-TX, or 1000BASE-T devices:

Step 1 To prevent electrostatic-discharge (ESD) damage, follow your normal board and component handling procedures.

When connecting to servers, workstations, and routers, insert a twisted-pair straight-through cable in a front-panel RJ-45 connector, as shown in Figure 2-9. When connecting to switches or repeaters, insert a twisted-pair crossover cable. See the “Cable and Adapter Specifications” section on page B-5for cable-pinout descriptions.

Note When connecting to 1000BASE-T devices, be sure to use a four twisted-pair, Category 5 cable.

Figure 2-9 Connecting to a 10/100 Port

SYST STAT DPLX SPD

1x	2x
		3x
			4x
				5x
				89474

Catalyst 2940 Switch Hardware Installation Guide

2-14 OL-6157-01