![]() letting two terminal (DTE) devices communicate without an interconnecting hub knot, i.e.connecting two devices directly, output of one to input of the other,.The crossing of wires in a cable or in a connector adaptor allows: Such a distinction between devices was introduced by IBM. ![]() Also be sure that the length of any twisted-pair connection does not exceed 100 meters (328 feet).A crossover cable connects two devices of the same type, for example DTE-DTE or DCE-DCE, usually connected asymmetrically (DTE-DCE), by a modified cable called a crosslink. ![]() Use 100-ohm Category 5, 5e or 6 unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for 1000BASE-T connections. Note that for 1000BASE-T operation, all four pairs of wires are used for both transmit and receive. These ports require that all four pairs of wires be connected. The table below shows the 1000BASE-T MDI and MDI-X port pinouts. You must connect all four wire pairs as shown in the following diagram to support Gigabit Ethernet connections.Īll 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use straight-through cables for all network connections to PCs or servers, or to other switches or hubs. (When auto-negotiation is enabled for any RJ-45 port on the switch, you can use either straight-through or crossover cable to connect to any device type.) If the twisted-pair cable is to join two ports and either both ports are labeled with an “X” (indicating MDI-X) or neither port is labeled with an “X” (which indicates MDI), a crossover must be implemented in the wiring.
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