Diamond TX Series - Automatic Shutdown

96 9 November 2001 Transmitters
Automatic Shutdown
Automatic Shutdown prevents the transmission of light
through severed fiber optic cables.
NOTE
If you plan to use the Automatic Shutdown feature, you must
set the transmitter to support this feature before you install the
transmitter. Automatic Shutdown is factory set to OFF.
For more information on
Automatic Shutdown in
redundant systems, see
DT-Switch Driver.
Automatic Shutdown of the transmitter is triggered only
under the following conditions:
• the transmitter is part of a two-way optical link,
• both the return receiver and the transmitter in the link are
set up to communicate the logic signal over the same
communication line, and
• the return receiver senses an absence of light in the return
path and sends the necessary logic to the transmitter to
disable it.
Automatic Shutdown is an
active process that disables a
transmitter only when the
transmitter receives the
required logic signal. Absence
of the logic signal will not
disable the transmitter, so this
module will operate normally
if no return receiver is in place
or Automatic Shutdown is not
used.
Return receivers can shut down transmitters that reside in
the same shelf or in different shelves:
• For modules in the same shelf, no additional equipment is
needed because the Automatic Shutdown logic signals
travel from the return receiver to the transmitter via the
shelf’s back panel.
• For modules in separate shelves, the logic signal exits the
return receiver and travels to the shelf’s manual shutdown
connector on the Diamond Transport shelf’s back panel.
The logic signal passes through a ribbon cable to the
correct shelf and then travels through the shelf’s back
panel to the correct transmitter.
To carry the logic signal between shelves, install a ribbon
cable with a 16-pin connector on each end.