Connect to the Switch Ports
This section describes how to connect to the fixed switch ports, the SFP module ports, and the
XENPAK module ports.
Connect to 10/100 and 10/100/1000 Ports
Follow these steps:
When you connect to servers,
Step 1
workstations, IP phones, wireless
access points, and routers, insert a
straight-through, twisted four-pair,
Category 5 cable in a switch 10/100 or
10/100/1000 port.
Use a crossover, twisted four-pair,
Category 5 cable when you connect to
other switches, hubs, or repeaters.
Insert the other cable end into an RJ-45 connector on the other device.
Step 2
The fixed ports on the Catalyst 3750 Power over Ethernet (PoE) switches provide PoE support for
devices that are compliant with IEEE 802.3af, and also provide Cisco pre-standard PoE support for
Cisco IP Phones and Cisco Aironet Access Points.
Each of the Catalyst 3750-24PS switch 10/100 ports or the Catalyst 3750G-24PS switch
10/100/1000 ports can deliver up to 15.4 W of PoE. On the Catalyst 3750-48PS or 3750G-48PS
switches, any 24 of the 48 10/100 or 10/100/1000 ports can deliver 15.4 W of PoE, or any
combination of the ports can deliver an average of 7.7 W of PoE at the same time, up to a maximum
switch power output of 370 W.
By default, a Catalyst 3750 switch PoE port automatically provides power when a valid powered
device is connected to it. For information about configuring and monitoring PoE ports, see the switch
software configuration guide. For information about troubleshooting PoE problems, see the
Catalyst 3750 Switch Hardware Installation Guide on Cisco.com.
The automatic medium-dependent interface crossover (Auto-MDIX) feature is enabled by
Note
default on switches running Cisco IOS Release 12.2(18)SE or later. 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, 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.
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10/100 or 10/100/1000 ports
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