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Operations Manual, HPA2, Compact Outdoor SSPA 205486 REV F 51
The Standby amplifier can be muted to have a “Cold Standby” condition. It keeps the SSPA
module powered down for power savings while the microprocessor and fans remain
operational. SSPAs with Parallel I/O board firmware version 3.50 or beyond are provided with
a true cold standby mode. In this mode, the SSPA will be muted automatically. Cold standby
mode has to be selected through a serial control interface (For details, see Table 10-6, data
address 20).
If the Standby amplifier switches to the On Line state, it will automatically un-mute and
transmit traffic. If the operator attempts to mute the On Line amplifier a warning message will
be displayed “You are about to mute the On Line unit. Proceed with Mute?”
Similarly, connect the second amplifier to the computer’s COM port and perform the 1:1
selections on the SSPA Settings window. Just as with the first amplifier, make sure that the
System mode is set to 1:1 redundant. Select a hierarchical address, HPA 1 or HPA 2 and a
startup state.
The amplifiers may then be disconnected from the computer’s COM port as the Compact
Outdoor Amplifiers’ microcontroller is now programmed for 1:1 redundancy control. It is not
necessary to run the Windows based M&C software with the redundant system. The M&C
software is only a convenience for remote monitoring and control of the redundant system.
The following sections detail the operation of the M&C software in 1:1 redundant system
operation.