B-3
Switch Ports and Network Cables
Twisted-Pair Cable/Connector Pin-Outs
Switch Ports and Network
Cables
Fiber-Optic
Twisted-Pair Cable/Connector Pin-Outs
The Auto MDI/MDI-X Feature: In the default configuration, “Auto”, the
fixed 10/100Base-TX ports on the SMC6624M switch all automatically detect
the type of port on the connected device and operate as either an MDI or MDI-
X port, whichever is appropriate. So for any connection, a “straight-through”
twisted-pair cable can be used -- you no longer have to use “crossover” cables,
although “crossover” cables can also be used for any of the connections. (The
100/1000Base-T module supports the IEEE 802.3ab standard, which includes
the Auto MDI/MDI-X feature.)
If you connect a SMC6624M switch twisted-pair port to another switch or hub,
which typically have MDI-X ports, the SMC6624M switch port automatically
operates as an MDI port. If you connect it to an end node, such as a server or
PC, which typically have MDI ports, the SMC6624M switch port operates as
an MDI-X port. In all cases, you can use standard “straight through” cables or
“crossover” cables.
100Base-FX 62.5/125 µm or 50/125 µm (core/cladding) diameter, graded-
index, multimode fiber-optic cables, complying with the
ITU-T G.651 and ISO/IEC 793-2 Type A1b or A1a respec-
tively, fitted with MT-RJ connectors
1000Base-SX 62.5/125 µm or 50/125 µm (core/cladding) diameter, graded-
index, multimode fiber-optic cables, complying with the
ITU-T G.651 and ISO/IEC 793-2 Type A1b or A1a respec-
tively, fitted with SC or MT-RJ connectors, depending on
the module used
1000Base-LX single mode fiber-optic cables, complying with the ITU-T
G.652 and ISO/IEC 793-2 Type B1 standards, fitted with SC
or MT-RJ connectors
OR
62.5/125 µm or 50/125 µm (core/cladding) diameter, graded-
index, multimode fiber-optic cables, complying with the
ITU-T G.651 and ISO/IEC 793-2 Type A1b or A1a respec-
tively, fitted with SC or MT-RJ connectors
Note: Multimode fiber-optic cabling may be used for a
1000Base-LX application, but a mode conditioning patch
cord may be needed. See the Installation Guide that came
with your module for more information.
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