As the photo shows, the pins are wired "straight across", rather than diagonally. This means that it does not work as an Ethernet/8P8C coupler because the transmit pins are mapped to unused pins (for 10/100 Mbit/s at least). Likewise, it doesn't act as a crossover either.
Is it wired wrong? Or is it a special form of a 1000Base-T crossover? Or is it perhaps used to correct the pins from another reversed device...?
1 Answer
The color coding of the wires does not comply with computer wiring standards so it isn't CAT5 or CAT6 cabling. The color code is for phone wiring - old style.
All the wires are completely crossed. This is a coupler to connect to RJ-45 phone wires. Probably was used to extend wire for a old office phone.
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