BDS Power Systems and Standby Powering 3

Question 1

Why are cable plant outside power supplies housed in sealed enclosures?

Accepted Answer

To protect internal components from moisture, temperature extremes, and insects

Answer

To increase the RF signal output of the supply

Answer

To reduce enclosure weight for easier pole installation

Answer

To improve AC-to-AC power conversion efficiency

Question 2

What is the primary advantage of a distributed power supply architecture over a centralized power architecture in an HFC network?

Accepted Answer

Reduced voltage drop and improved reliability through shorter power runs

Answer

Lower initial equipment purchase cost

Answer

Simplified network management from a single control point

Answer

Higher output power available from each individual supply

Question 3

What is the purpose of a reverse power flow configuration in an HFC cable plant?

Accepted Answer

To allow an alternative power source to feed power upstream and restore service when the primary supply fails

Answer

To send management data from the headend to field equipment using the return path

Answer

To charge customer premises equipment batteries from the cable plant

Answer

To test power supply output levels remotely from the headend

Question 4

When replacing a cable plant power supply, what is the critical safety precaution related to the coaxial cable?

Accepted Answer

De-energize the coaxial cable before working on power connections

Answer

Disconnect all battery strings before touching any cable connections

Answer

Always position a ladder to avoid creating a ground fault path

Answer

Schedule replacement only during daylight hours for adequate visibility

Question 5

What is the function of the status monitoring port on a cable plant power supply?

Accepted Answer

To transmit operational data such as voltage, current, battery status, and alarms to a network management system

Answer

To display a real-time readout of RF signal levels at the supply location

Answer

To automatically dispatch a repair technician when the supply enters alarm state

Answer

To regulate output voltage in response to downstream load changes

Question 6

What does 'float charging' mean in the context of cable plant standby battery maintenance?

Accepted Answer

Maintaining fully charged batteries by applying a continuous low-level trickle charge to offset self-discharge

Answer

Charging batteries while they are submerged in a temperature-regulating coolant

Answer

Alternating between charge and deep-discharge cycles to condition battery plates

Answer

Rapidly recharging batteries to full capacity after a deep discharge event

Question 7

Which condition most directly triggers a 'low battery' alarm in a cable plant power supply?

Accepted Answer

Battery terminal voltage dropping below a preset minimum level during discharge

Answer

RF signal levels falling below the minimum acceptable threshold downstream

Answer

Utility AC input voltage fluctuating beyond normal tolerance limits

Answer

Output current exceeding the supply's rated maximum capacity