Setting up and operating the BUC system
78 Block Up Converter Systems 6700/6900 series User Guide
Controlling the redundancy system
For correct operation of the redundancy system, both BUCs
must be switched on.
To switch on the BUCs:
1 Switch on the modem, and if you have installed an
externally-powered BUC system, switch on the power to
the BUC.
The standby state of the off-line BUC is dependent on how the
Redundancy mode is set. The off-line BUC can be set to two
states:
• power amplifier on (hot standby system)
• power amplifier off (warm standby system)
Hot standby
In hot standby, the power amplifier of each BUC is activated
ready for immediate use. A hot standby system has greater
power consumption than any other redundancy system
configuration.
To set the BUCs to operate in hot standby:
1 Set the Redundancy mode to Hot standby using a
Hand-held Controller 6560, a Remote Controller 6570,
or serial commands on a PC running terminal-emulating
software.
NOTE
In a high-power BUC system, the high-power
SSPA is always activated.
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