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GS108T Smart Switch Software Administration Manual
C-6 Network Cabling
v1.0, December 2007
located. NEXT measures the amount of energy that is “returned” to the sender end. The factors
that affect NEXT and cross talk are exactly the same as outlined in the
“Return Loss” section. The
cross-talk performance is directly related to the quality of the cable installation.
Patch Cables
When installing your equipment, replace old patch panel cables that do not meet Category 5e
specifications. As pointed out in the
“Near End Cross Talk” section, this near end piece of cable is
critical for successful operation.
RJ-45 Plug and RJ-45 Connectors
In a Fast Ethernet network, it is important that all 100BASE-T certified Category 5 cabling use
RJ-45 plugs. The RJ-45 plug accepts 4-pair UTP or shielded twisted-pair (STP) 100-ohm cable
and connects into the RJ-45 connector. The RJ-45 connector is used to connect stations, hubs, and
switches through UTP cable; it supports 10 Mbps, 100 Mbps, or 1000 Mbps data transmission.
Figure C-4 shows an RJ-45 plug and RJ-45 connector with built-in LEDs.
Table C-2 lists the pin assignments for the 10/100 Mbps RJ-45 plug and the RJ-45 connector.
Figure C-4
Table C-2. 10/100 Mbps RJ-45 Plug and RJ-45 Connector Pin Assignments
Pin Normal Assignment on Ports 1 to 8 Uplink Assignment on Port 8
1 Input receive data + Output transmit data +
2 Input receive data – Output transmit data –
3 Output transmit data + Input receive data +