HP J4868A, Install Manual

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B-2
Switch Ports and Network Cables
Twisted-Pair Cable/Connector Pin-Outs
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Cables
Twisted-Pair
Fiber-Optic
Twisted-Pair Cable/Connector Pin-Outs
The “HP Auto-MDIX” Feature: The fixed 10/100Base-TX ports on the
Switch 2124 all have the “HP Auto-MDIX” feature. They automatically detect
the type of port on any device connected to the Switch 2124 and then operate
as either an MDI or MDI-X port, whichever is appropriate. If you connect a
Switch 2124 twisted-pair port to another switch or hub, which typically have
MDI-X ports, the Switch 2124 ports operates as an MDI port and connects
correctly. If you connect an end node, such as a server or PC which typically
have MDI ports, to the Switch 2124, the switch port operates as an MDI-X port
and connects correctly.
So, for any connection, a “straight-through” twisted-pair cable can be used —
you no longer have to use “crossover” cables . If you do happen to use a
correctly wired crossover cable, though, the switch will still be able to
automatically detect the MDI/MDI-X operation of the connected device and
will link correctly.
10 Mbps Operation Category 3, 4, or 5 100-ohm differential unshielded twisted-
pair (UTP) or shielded twisted-pair (STP) cable, complying
with IEEE 802.3 10Base-T specifications, fitted with RJ-45
connectors
100 Mbps Operation Category 5 100-ohm differential UTP or STP cable,
complying with IEEE 802.3u 100Base-TX specifications,
fitted with RJ-45 connectors
100Base-FX 62.5/125 m or 50/125 m (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 connectors