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10/100BASE-T Downlink Ports
You can set the 10/100BASE-T downlink ports to operate at 10 or 100 Mb/s in full-duplex or half-duplex mode. You can
also set these ports for speed and duplex autonegotiation in compliance with IEEE 802.3AB. (The default setting is
autonegotiate.) 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 (that is, 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).
100BASE-TX traffic requires CAT5 cable. 10BASE-T traffic can use Category 3 or Category 4 cables.
When connecting the switch to workstations, servers, routers, and Cisco IP phones, make sure that the cable is a
straight-through cable.
You can use the
mdix auto
interface configuration command in the command-line interface (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. For configuration
information for this feature, see the switch software configuration guide or the switch command reference.
10/100BASE-T Uplink Ports
The IEEE 802.3u 10/100BASE-T uplink ports provide full-duplex 10, 100 Mb/s connectivity over CAT5 unshielded
twisted pair (UTP) copper cabling. The default setting is autonegotiate. The cable can be up to 100 m (0.1 km) in length.
10/100/1000BASE-T Uplink Ports
The IEEE 802.3u 10/100/1000BASE-T uplink ports provide full-duplex 10, 100 or 1000 Mb/s connectivity over CAT5
unshielded twisted pair (UTP) copper cabling. The default setting is autonegotiate. The cable can be up to 100 m
(0.1 km) in length.
100 Mb/s SFP Module Downlink Slots
The IEEE 802.3u 100 Mb/s SFP module downlink slots provide full-duplex 100 Mb/s connectivity over multi-mode (MM)
fiber cables or single-mode (SM) fiber cables. These ports use a SFP fiber-optic transceiver module that accepts a dual
local connector (LC). Check the
for the cable type and length.
100/1000 Mb/s SFP Module Uplink Slots
The IEEE 802.3u 100 Mb/s SFP module uplink slots provide full-duplex 100 or 1000 Mb/s connectivity over multi-mode
fiber (MMF) or single-mode fiber (SMF) cables, or CAT5 (or later) cables. These ports use a SFP fiber-optic transceiver
module that accepts a dual LC connector. See
for cable type and length.
10/100/1000BASE-T Copper SFP Module Uplink Slots
The IEEE 802.3 1000BASE-T copper SFP module slots provide full-duplex 1000Base-T connectivity over copper wire.
These ports use a copper SFP transceiver module that accepts an RJ-45 connector. See
for cable type and length.
Dual-Purpose Fast Ethernet Uplink Ports
You can configure the dual-purpose Fast Ethernet uplink ports on the switch as either 10/100BASE-T ports or as 100
Mb/s SFP-module ports. You can set the 10/100 ports to autonegotiate, or you can configure them as fixed 10 or 100
Mb/s ports.
