Installation guide

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Catalyst 2960 Switch Hardware Installation Guide
OL-7075-09
Chapter 1 Product Overview
Front Panel Description
When you connect the switch to workstations, servers, routers, and Cisco IP Phones, be sure that the
cable is a straight-through cable. When you connect the switch to switches or hubs, use a crossover cable.
When using a straight-through or crossover cable for 1000BASE-T connections, be sure to use a twisted
four-pair, Category 5 or higher cable for proper operation. Pinouts for the cables are described in
Appendix B, “Connector and Cable Specifications.”
You can use the mdix auto interface configuration command in the CLI to enable the automatic
medium-dependent interface crossover (auto-MDIX) feature. When the auto-MDIX feature is enabled,
the switch detects the required cable type for copper Ethernet connections and configures the interfaces
accordingly. Therefore, you can use either a crossover or a straight-through cable for connections to a
copper 10/100/1000 or 1000BASE-T SFP module port on the switch, regardless of the type of device on
the other end of the connection. For configuration information for this feature, see the switch software
configuration guide or the switch command reference.
PoE Ports (Only Catalyst 2960 PoE Switches)
This section applies only to the Catalyst 2960-24PC-L, 2960-24LT-L, 2960-24PC-S, 2960-24LC-S,
2960 48PST-L, and 2960-48PST-S switches.
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
• The 10/100 ports on the Catalyst 2960-Plus 24PC-L, 2960-24PC-L, 2960-Plus 48PST-L,
2960-48PST-L, 2960-Plus 48PST-S, 2960-48PST-S, 2960-Plus 24PC-S, and 2960-24PC-S, switches
and ports 1 to 8 of the 10/100 ports on the Catalyst 2960-24LT-L, 2960-Plus 24LC-L, 2960-Plus
24LC-S, and 2960-24LC-S switches provide PoE support for devices that are compliant with IEEE
802.3af. The Cisco prestandard PoE is also supported for Cisco IP Phones and Cisco Aironet Access
Points.
• Each of the PoE ports on the Catalyst 2960 switches deliver up to 15.4 W of PoE.
The Catalyst 2960-Plus 24PC-L, 2960-24PC-L, 2960-Plus 48PST-L, 2960-48PST-L, 2960-Plus
48PST-S, 2960-48PST-S, 2960-Plus 24PC-S, and 2960-24PC-S switches deliver a maximum power
output of approximately 370-W PoE power.
The Catalyst 2960-24LT-L, 2960-Plus 24LC-L, 2960-Plus 24LC-S, and 2960-24LC-S switches
deliver a maximum power output of approximately 124-W PoE power.
• On a per-port basis, you can control whether or not a Catalyst 2960 PoE port automatically provides
power when an IP phone or an access point is connected. The device manager, Network Assistant,
and the CLI provide PoE settings for each 10/100 PoE port:
– Auto: When you select the Auto setting, the port provides power only if a valid powered device,
such as an IEEE 802.3af-compliant powered device, a Cisco prestandard IP phone, or a Cisco
prestandard Cisco access point, is connected. The Auto setting is the default.
– Never: When you select the Never setting, the port does not provide power even if a Cisco
IP phone or an access point is connected.