METRObility Optical Systems R111-15, R111-18 3Set the MDI-II/MDI-X Switch twisted-pair ports only

3Set the MDI-II/MDI-X Switch (twisted-pair ports only)

To eliminate the need for crossover cables, the Radiance line cards have an MDI-IIto MDI-Xslide switch for each twisted-pair port. This switch is positioned directly behind its associated RJ-45 connector and allows simple setup in either straight-through (default) or crossover configurations. See the diagrams on pages 5 and 6 for the location of the switch.

When setting the MDI-IIto MDI-Xswitch, observe the positioning of the following symbols:

•the parallel symbol (II) indicates a straight-through or parallel connection. (default)

•the cross symbol (X) indicates a crossover connection.

These symbols are clearly marked on the printed circuit board. Simply slide the switch in the direction of the appropriate symbol. Use the following tables as a guide.

A device that is wired straight through needs one crossover connection:

If the cable is	the MDI-II to MDI-X Switch Setting should be
straight through	X
crossover	II

A device that is wired crossover needs a parallel connection:

If the cable is	the MDI-II to MDI-X Switch Setting should be
straight through	II
crossover	X

Radiance 10Mbps Single Interface Line Cards 7