Datasheet

Hub
Crossover Crossover Straight Straight
Switch
Crossover Crossover Straight Straight
Router
Straight Straight Crossover Crossover
Workstation
Straight Straight Crossover Crossover
Note: The ports on Catalyst switches that run Cisco IOS
®
Software (Native) can be configured to act as
Layer 2 (L2) or Layer 3 (L3) ports. When you connect the RJ-45 cable from a Layer 3 port, which acts as a
router port, to other devices, use the previous table. In summary, the cables used do not change, regardless
of whether the port is configured to be in Layer 2 (switch port) or Layer 3 (router port) mode.
Most Common Cable Connectors
These diagrams show some of the most common cable types and connectors used on Catalyst switches.
RJ-45 RJ-21 Telco
This is used in order to connect
to 10/100 or 10/100/1000
Ethernet ports and 1000Base-T
Gigabit Interface Converter
(GBIC) or small form factor
pluggable (SFP) GBIC ports.
10/100/1000 Ethernet ports
must use four twisted-pair
Category 5, 5e or 6 cables.
This is used in order to
connect to 10/100BASE-TX
RJ-21 telco interfaces. Use
Category 5 UTP cables with
male RJ-21.
MT-RJ Fiber-Optic SC Fiber-Optic
This is used in order to
connect to 100Base-FX fiber-
optic ports. Use multimode
fiber (MMF) cables with MT-
This is used in order to connect
to 100Base-FX, 1000Base-SX,
Long Wavelength/Long Haul
(LX/LH) and ZX fiber-optic