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TB9400/TN9275 Installation and Operation Description 35

1.8.4 Power Management and Distribution

The PMU manages the supply of power to ensure uninterrupted operation

of the base station. A range of parameters is monitored and these can

trigger alarms that are sent to the reciter. Alarms can be monitored via the

WebUI and reported via SNMP traps; they are also recorded in the reciter’s

internal log file.

AC to DC

Changeover

When the PMU has an AC and a DC module, the base station can be

station will default to the AC supply if both supplies are provided. If the

AC supply becomes unavailable, a seamless changeover from the AC to

DC supply takes place, providing that the battery voltage is above the

configured minimum startup voltage. Use a web browser to check whether

the base station is running on battery or mains power.

DC Operation When the base station is running off the DC supply and the battery voltage

falls below the configured minimum, the base station will enter battery

protection mode to protect the battery and base station equipment. The

standby power supply card maintains the power to the PMU

microprocessor, while the rest of the PMU is shut down. When the battery

voltage rises to the configured startup setting, power is resumed to the DC

supply. Refer to “PMU Operation on DC Input” on page 37 for more

detailed information.

Auxiliary Power

Control

The output from the auxiliary power supply board can be used to power

other site equipment. The maximum output is 40W.

Distribution Figure 1.8 shows how power is distributed to modules in the subrack. The

28VDC output from the PMU is fed directly to the PA in a single base

station, or directly to PA 1 in a dual base station, and to the other modules

via the subrack interconnect board. Power to the reciters and front panel is

current-limited by self-resetting fuses on the subrack board.

The AC converter has a series switch that breaks the phase input to the

converter. In contrast, the DC input has much higher current ratings. Its

switch does not disconnect power from the DC converter itself, but disables

the converter by switching off its control circuitry.

The outputs from both the AC and DC high power converters are added

together and fed to the modules via the high-current outputs. The auxiliary

output is also tapped off this summed output.

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