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- Jan 1, 1970
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We just recently had a MLS 18D multi line phone installed in our warehouse. Our maintenance man pulled the wall jack to rewire to a new location in the room, but failed to label the wires before he pulled them. Now it is my job to reconnect them, but I am not familiar with multi-line phone wiring. My memory tells me that the phone is really a serial port device which connects to a "controller". I believe one pair is transmit and another pair is receive. Since we are using CAT 5, 4-twisted pair wiring at our facility, does anyone know if a simple way to determine which pair goes to which wall jack terminal?