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OPERATION LBI-39128
27
Transmitter Lower Alarm Limit
The value of this parameter is used by the PMU as the
lower alarm limit for each transmitter’s output power. A
single value for this parameter (the same limit for all
transmitter channels) is programmed into the Site Controller
computer’s Personality PROMs by the factory, and is used
to initially configure the Site Controller computer’s Active
Configuration during power-up.
The value of this parameter may then be re-configured
in the Site Controller computer’s Active Configuration
through a System Manager. It will seem as though the
System Manager is able to re-configure a different limit for
each transmitter. However, the first non-zero value
(ascending channel number order) will apply to all
transmitters. If the system is not equipped with a System
Manager, a workable value of this parameter must be
programmed into the Personality PROMs by the factory (as
opposed to a default value). The recommended value for this
parameter is 50% of the transmitter’s full rated power
output.
The value of this parameter is sent to the PMU during
the EDACS Configuration Setup, where it is used by the
PMU to determine if a transmitter’s output power is too low.
The value of this parameter may be temporarily changed in
the PMU (a different value may be assigned for each
transmitter channel). These values will remain in effect until
the next EDACS Configuration Setup.
Transmitter Upper Alarm Limit
This parameter is used by the PMU as the upper alarm
limit for each transmitter’s output power. Its purpose is to
detect when a transmitter or its power sensor is out of
adjustment. The recommended value for this limit is 125%
of the transmitter’s set output power (note that set power
may be substantially below full rated power).
This parameter is not programmed into the Site
Controller computer’s Personality PROMs and is therefore
not re-configurable through a System Manager. The value of
this parameter is only contained in the PMU.
A factory default value (125 watts) for this parameter
has been programmed into the PMU. This factory default is
used to configure the PMU’s Active Configuration any time
the PMU is initialized. The value of this parameter may be
re-configured with an RS232 CRT terminal connected to the
PMU. This re-configuration will last until you deliberately
initialize the PMU. This re-configuration permits a different
upper alarm limit for each transmitter.
Antenna Lower Alarm Limit
This parameter is used by the PMU as the lower alarm
limit for each antenna’s input power. Its purpose is to detect
when the loss through the combiner is too high, or the
antenna power sensor is damaged or out of adjustment. The
recommended value for this limit is 25% of the set power
output of a single transmitter.
This parameter is not programmed into the Site
Controller computer’s Personality PROMs and is therefore
not re-configurable through a System Manager. The value of
this parameter is only contained in the PMU.
A factory default value (0.0 watts) for this parameter
has been programmed into the PMU. This factory default is
used to configure the PMU’s Active Configuration any time
the PMU is initialized. The value of this parameter may be
re-configured with an RS232 CRT terminal connected to the
PMU. This re-configuration will last until you deliberately
initialize the PMU. This re-configuration permits a different
lower alarm limit for each antenna’s input power.
Note that if the lower alarm limit for the antenna’s input
power is left at the factory default of 0.0 watts and both
circuits of the antenna power sensor are disconnected from
the PMU (or never were connected in the first place), the
PMU will never report an alarm for this antenna.
Antenna Upper Alarm Limit
This parameter is used by the PMU as the upper alarm
limit for each antenna’s input power. Its purpose is to detect
when the antenna power sensor is damaged or out of
adjustment. The recommended value for this limit is 75% of
rated power of a single transmitter multiplied by the number
of transmitters using the antenna.
This parameter is not programmed into the Site
Controller computer’s Personality PROMs and is therefore
not re-configurable through a System Manager. The value of
this parameter is only contained in the PMU.
A factory default value (999.9 watts) for this parameter
has been programmed into the PMU. This factory default is
used to configure the PMU’s Active Configuration any time
the PMU is initialized. The value of this parameter may be
re-configured with an RS232 CRT terminal connected to the
PMU. This re-configuration will last until you deliberately
initialize the PMU. This re-configuration permits a different
upper alarm limit for each antenna’s input power.