Cisco 2975 - Manual (Page 38)

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Catalyst 2975 Switch Hardware Installation Guide
OL-17784-01
Chapter 2 Switch Installation
Where to Go Next
Caution Noncompliant cabling or powered devices can cause a PoE port fault. Use only standard-compliant
cabling to connect Cisco prestandard IP Phones and wireless access points or IEEE 802.3af-compliant
devices. You must remove any cable or device that causes a PoE fault.
Step 3 Reconfigure and reboot the connected device if needed.
Step 4 Repeat Steps 1 through 3 to connect each device.
Note Many legacy powered devices, including older Cisco IP phones and access points that do not fully
support IEEE 802.3af, might not support PoE when connected to the switches by a crossover cable.
The autonegotiation and the automatic medium-dependent interface crossover (auto-MDIX) features are
enabled by default on the switch.
With autonegotiation, the switch ports configure themselves to operate at the speed of the attached
device. If the attached device does not support autonegotiation, you can set the switch port speed and
duplex parameters.
With auto-MDIX, the switch detects the required cable type for copper Ethernet connections and
configures the interface accordingly. If auto-MDIX is disabled, use
Table 2-1 to select the correct cable.
See the “Cables and Adapters” section on page B-3 for cable-pinout descriptions.
Where to Go Next
You can use the switch default configuration, or use any of the management options described in the
“Management Options” section to change the switch settings.
Table 2-1 Recommended Ethernet Cables (When Auto-MDIX is Disabled)
Device Crossover Cable 1
1. 100BASE-TX and 1000BASE-T traffic requires twisted four-pair, Category 5, Category 5e, or
Category 6 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