Installation guide

2-49
Catalyst 3750 Switch Hardware Installation Guide
OL-6336-01
Chapter 2 Switch Installation
Connecting to the 10/100 and 10/100/1000 Ports
Warning Voltages that present a shock hazard may exist on Power over Ethernet (PoE)
circuits if interconnections are made using uninsulated exposed metal
contacts, conductors, or terminals. Avoid using such interconnection methods,
unless the exposed metal parts are located within a restricted access location
and users and service people who are authorized within the restricted access
location are made aware of the hazard. A restricted access area can be
accessed only through the use of a special tool, lock and key or other means of
security. Statement 1072
You can configure the 10/100 and 10/100/1000 ports on the Catalyst 3750-24PS,
3750G-24PS, 3750-48PS, and 3750G-48PS switches either to automatically
provide PoE when a Cisco IP Phone, Cisco Aironet Access Point, or end device
compliant with IEEE 802.3af is connected or never to provide PoE, even if an IP
phone or an access point is connected. The default setting is Auto. To prevent ESD
damage, follow your normal board and component handling procedures.
Use the guidelines in Table 2-2 to select the correct cable for connecting the
switch 10/100 and 10/100/1000 ports to other devices. See the “Cable and Adapter
Specifications” section on page B-5 for cable-pinout descriptions.
Table 2-2 Recommended Ethernet Cables
Device Crossover Cable
1
1. 100BASE-TX and 1000BASE-T traffic requires twisted four-pair, Category 5 cable.
10BASE-T traffic can use Category 3 or Category 4 cable.
Straight-Through Cable
1
Switch to switch Yes No
Switch to hub Yes No
Switch to computer
or server
No Yes
Switch to router No Yes
Switch to IP phone No Yes