Installation guide

Chapter 1 Product Overview
Front Panel Description
1-14
Catalyst 3750 Switch Hardware Installation Guide
OL-6336-01
Note 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, 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.
The Auto-MDIX feature is enabled by default on switches running Cisco IOS
Release 12.2(18)SE or later. For releases between Cisco IOS
Release 12.1(14)EA1 and 12.2(18)SE, the Auto-MDIX feature is disabled by
default. For configuration information for this feature, see the switch software
configuration guide or the switch command reference.
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.
SFP Module Slots
Catalyst 3750 switches with SFP module slots support these SFP modules:
• 1000BASE-SX
• 1000BASE-LX
• 1000BASE-ZX
• 100BASE-FX
• 1000BASE-T
• CWDM
For a list of the SFP modules that the switches support, see the Catalyst 3750
release notes.