Raytheon SNV-12, Инструкция по установке и эксплуатации

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SNV-12 Operations Manual
4-11
4.10 Manual TX Selection
There are a variety of ways for a dispatcher to control which sites transmit console audio when
the console PTT is activated. There are two “Momentary Manual TX Select” modes, one via
RS-232 remote control, and the other requiring a momentary low at the rear panel inputs for the
chosen site. If either is activated, it controls console TX and Repeat Mode transmissions until
the Holdover Timer expires. Two “latched” Manual TX Select inputs similarly control console
TX and Repeat Mode transmission routing until the inputs are changed, with no involvement
by the Holdover Timer. These two “latched” TX Select versions instead remain in control until
the commands are removed: for the rear panel input, until the TXSEL input is allowed to go
high; for the RS-232 input, until another RS-232 command reverses the previous command.
4.11 Removal and Replacement of Modules
NOTE: The removal and replacement of system modules should be
performed by a trained technician only and should not be performed by
the communications system operator
All of the SNV-12 Modules, except the PSM power supply module, can be "Hot-Plugged"; that
is, they can be removed and inserted while the unit's main power is on and the unit is
operational without any damage resulting. Some temporary disruption of the voting process
may result. Changing even an idle Site Voter Module may disrupt a currently voted path. It is
best to wait until the entire system is idle before changing a module. Changing a Console
Interface (CIM) or Control Processor (CPM) Module will certainly disrupt the operation
temporarily, and changing the CPM Module will require the system to be re-initialized (power
shut off and back on). If a CIM or SVM module is plugged in very slowly, the CPM may
detect the presence of the module, but be unable to verify the revision of software currently
residing on it. In this case (or if the replacement module does not have the current software),
wait until the software download procedure is complete before proceeding. The power must be
turned off and the power cord removed when installing or removing the PSM power supply
module.
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