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Catalyst 3750 Switch Hardware Installation Guide
OL-6336-07
Chapter 1 Product Overview
10/100 and 10/100/1000 Ports
Catalyst 3750G Integrated Wireless LAN Controller Switch Front Panel Description
The Catalyst 3750G Integrated Wireless LAN Controller switches have an integrated Cisco wireless
LAN controller. Depending on the switch model, the integrated wireless controller can support up to 25
or 50 Cisco Lightweight Access Points. The 10/100/1000 PoE ports on the Catalyst 3750G-24WS-S25
and the 3750G-24WS-S50 switch are numbered 1 through 24 and grouped in pairs. The first member of
the pair (port 1) is above the second member (port 2), as shown in Figure 1-14. Port 3 is above port 4,
and so on. The SFP module slots are numbered 25 and 26. The switch also has two internal Gigabit
Ethernet ports that connect the switch and the controller. The internal ports are numbered as ports 27 and
28 and are not visible on the front panel.
Figure 1-14 Catalyst 3750G-24WS-S25 and 3750G-24WS-S50 Switches Front Panel
10/100 and 10/100/1000 Ports
You can set the 10/100 ports on the Catalyst 3750 switches to operate in any combination of half duplex,
full duplex, 10 Mb/s, or 100 Mb/s. You can set the 10/100/1000 ports to operate in 10 or 100 Mb/s in
half or full duplex, or in 1000 Mb/s in full duplex.
You can set both the 10/100 and the 10/100/1000 ports for speed and duplex autonegotiation, in
compliance with IEEE 802.3AB. (The default setting is autonegotiate.)
Note You can configure duplex mode to half, full, or autonegotiate on Gigabit Ethernet interfaces if the speed
is set to 10 or 100 Mb/s. You cannot configure half-duplex mode on Gigabit Ethernet interfaces if the
interface speed is 1000 Mb/s.
When set for autonegotiation, the port senses the speed and duplex settings of the attached device and
advertises its own capabilities. If the connected device also supports autonegotiation, the switch port
negotiates the best connection (the fastest line speed that both devices support and full-duplex
transmission if the attached device supports it) and configures itself accordingly. In all cases, the
attached device must be within 328 feet (100 meters).
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