Allied-telesis AT-MR820TR Manual de usuario descargar pdf (Pagina 56)

Technical Specifications

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 4.

Table 4: Straight-through RJ45 Pin Assignments

Crossover Wiring

Two AT-MR420TR/AT-MR820TR 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 using the MDI/MDI-X switch.

When connecting AT-MR420TR/AT-MR820TR Micro Repeaters, a

crossover must be used in the wiring when using any port other than

4/8. See Table 5 for crossover pin assignments.

Table 5: Crossover RJ45 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-)

MRx20TR(STP/UTP)_BookA Page 34 Thursday, April 3, 1997 5:24 PM

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Allied-telesis AT-MR820TR Manual de usuario Pagina 56