Black Box twister 7000, Installation & User Manual

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“twister” Media Converter 7000 11
MDI-
II
to MDI-X
All “twister” modules with twisted-pair ports
*
have an MDI-
II
to
MDI-X switch. This switch is positioned directly behind it’s
associated RJ-45 connector and allows simple setup in either
straight through (default) or crossover configurations.
When setting the MDI- II to MDI-X switch, observe the position-
ing 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 table 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
Link Loss Carry Forward (LLCF)
**
LLCF functionality is incorporated on all “twister” modules with
the exception of the LE7313C-R2 (BNC) and LE73XXC TELCO
modules. Refer to the User Guide section titled Link Loss Carry
Forward for more information.
• LE731XC and LH741XC modules have a jumper for setting
the LLCF. Refer to the module diagrams in the User Guide
section of this document for more detailed information
regarding configuration of this jumper.
• LH740XC and LE7402C-TX “redundant twister”
modules have a DIP switch for setting LLCF. Refer to the
“redundant twister” module diagrams in the User Guide
section of this document for more detailed information
regarding the location and setting of this DIP switch.
* This is not applicable to the LE7302C (TELCO) module.
** The LLCF default setting is: disabled. Link Loss Carry Forward (LLCF) functionality is not provided on
the LE7313C-R2 (BNC) or the LE73XXC (TELCO) modules.