Allied Telesis AT-MR815T - Manual (Page 36)

Technical Specifications
26
Straight-through Wiring
If the twisted-pair link segment is to join two ports on a switch, and only one of
the ports has an internal crossover, the two pairs of wires must be straight-
through, as shown in Table 5.
Table 5: Straight-through RJ-45 Pin Assignments
Crossover Wiring
Two AT-MR415T/AT-MR815T Micro Repeaters can communicate only if the
transmitter on one unit is connected to the receiver on the other unit. This
reversal, or crossover function, can be implemented either in the wiring or in
the device itself. When connecting AT-MR415T/AT-MR815T Micro Repeaters,
a crossover must be implemented in the wiring. Refer to Table 6 for crossover
pin assignments.
Table 6: Crossover RJ-45 Pin Assignments
Hub Device
1 (TX+) 1 (TX+)
2 (TX-) 2 (TX-)
3 (RX+) 3 (RX+)
6 (RX-) 6 (RX-)
AT-MR420TR/MR820TR AT-MR420TR/MR820TR
1 (TX+) 3 (RX+)
2 (TX-) 6 (RX-)
3 (RX+) 1 (TX+)
6 (RX-) 2 (TX-)