Triplett TVR10/100/1000 - Manual (Page 38)

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AT&T 258A (EIA/TIA 568B) Signal Definition in Diagram Form
PIN #
POLARITY FUNCTION
1 (+) Transmit Data
2 (-) Receive Data
3 (+) Transmit Data
6 (-) Receive Data
4 (-) Receive Data
5 (+) Transmit Data
7
(+) Transmit Data
8 (-) Receive Data
Mixing Telephones and Data: Some installations mix Base-T
networks on the same wires that are used in a telephone system.
They are subject to the same types of problems that telephone
systems have, ranging in difficulty from the typical errors in wiring
and connectors to intermittent connections.
Care must be taken to
avoid electrical connection between networks and telephone
systems.
Pair 4
Pair 3
Pair 1
Pair 2