6
RS-232 TO FIBER OPTIC MULTIPLEXOR
This section describes the installation procedures for the multiplexor in a
standard 19-inch rack and explains how to connect the optical cable and
the terminal devices.
If possible, test the pair of multiplexors and the optical cable with each
other before installation. Testing before installation will reveal any damage
that might have occurred to either mux or cable during shipping, so you’ll
know that the items weren’t damaged during installation. This initial testing
and troubleshooting are much easier when both muxes are placed close to
each other and both ends of the cable are easily accessible.
Standard units of this multiplexor are supplied with four rubber feet for
placement on a table top or shelf. If it is necessary to remove the feet for
another type of mounting, first remove only one foot and check the type of
mounting screw used.
If a 4-40 machine screw is used to mount the feet, the unit is an early one
that uses the foot-mounting screws to hold the internal printed circuit board in
place. DO NOT REMOVE ALL THE SCREWS AT THE SAME TIME. Remove
only one foot at a time and replace its mounting screw with a 4-40 x 3/16-inch
flathead screw. (Holes in the chassis bottom are countersunk.)
If the foot-mounting screws are self-tapping sheet-metal screws, the unit
is a newer one with separate mounting holes for the feet. The feet can be
removed without replacing the screws.
3.1 Rackmounting
For rackmounting, a pair of brackets are available for the necessary mounting
flanges (product code RM901). To attach the rackmount brackets, first
remove the four screws closest to the front of the chassis from one side of
the multiplexor chassis. See Figure 3-1 on the next page.
Do not remove the screws from both sides at the same time, because the
front panel may fall out. If this happens, the front panel can be replaced by
inserting it back into the multiplexor chassis and pressing against the top and
bottom of the front panel at the same time, holding it against the edge of the
internal printed circuit board, while positioning the panel to line up its
threaded inserts with the holes in the multiplexor chassis.
3. Installation
