METRObility Optical Systems R111-1T - Manual (Page 7)

Radiance 10Mbps Single Interface Line Cards 7
3
Set the MDI-II/MDI-X Switch
(twisted-pair ports only)
To eliminate the need for crossover cables, the Radiance line cards
have an MDI-
II to MDI- X slide 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- II to MDI- X switch, 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
straight through
crossover
the MDI-II to MDI-X Switch Setting should be
X
II
A device that is wired crossover needs a parallel connection:
If the cable is
straight through
crossover
the MDI-II to MDI-X Switch Setting should be
II
X