SCTE Broadband TelecomCenter Specialist
(BTCS)
Facilities Section Exam
Questions & Answers
Covers the facility power systems (utility, standby generators, UPS, batteries), grounding and
bonding, HVAC and environmental control, fire suppression and life safety, facility safety/codes
and hazard awareness, physical plant security and monitoring, reliability/redundancy/standards
compliance and more.
,Q1. What is the primary purpose of a standby generator at a headend or
hub facility?
Answer: To provide continued electrical power to the facility during an
extended utility power outage, maintaining service reliability.
Q2. What is the typical fuel source difference between a 'standby'
generator and a 'prime power' generator?
Answer: A standby generator is sized and rated for intermittent, emergency
backup use, while a prime power generator is designed to run continuously
as the primary power source.
Q3. What is an Automatic Transfer Switch (ATS) used for in a facility
power system?
Answer: To automatically switch the electrical load from utility power to
standby generator power (and back) when a utility outage is detected.
Q4. Why is it important to perform regular load-bank testing on a
standby generator?
Answer: To verify the generator can actually handle its rated load under
real conditions, since running with little or no load for testing alone may not
reveal problems that occur under full load.
Q5. What is the function of an Uninterruptible Power Supply (UPS) in a
headend facility?
Answer: To provide immediate, uninterrupted power to critical equipment
during the transition period between a utility outage and generator startup,
and to condition power against fluctuations.
Q6. What are the two common UPS topologies used in cable facilities?
Answer: Standby (offline) UPS and online (double-conversion) UPS.
Q7. Why might an online (double-conversion) UPS be preferred over a
standby UPS for critical headend equipment?
Answer: Because an online UPS continuously supplies power through the
inverter with no transfer time, providing cleaner and more consistent power
with zero switchover gap.
, Q8. What is the purpose of battery strings in a DC power plant used in a
headend?
Answer: To supply reserve DC power to equipment in the event of an AC
power interruption, bridging the gap until generator power is established or
the outage ends.
Q9. What type of battery is most commonly used in
telecommunications standby power plants?
Answer: Valve-regulated lead-acid (VRLA) batteries, though flooded
lead-acid and increasingly lithium-ion batteries are also used.
Q10. Why is proper ventilation important in a room containing flooded
lead-acid batteries?
Answer: Because charging can produce hydrogen gas, which is flammable
and must be adequately vented to prevent a buildup that could pose an
explosion risk.
Q11. What does 'reserve time' or 'reserve capacity' refer to in a battery
backup system?
Answer: The length of time the batteries can supply power to the connected
load before being depleted.
Q12. What is a rectifier's role in a DC power plant?
Answer: To convert incoming AC utility power into DC power used to run
equipment and charge the battery string.
Q13. Why should standby generator fuel supplies be regularly
inspected and maintained?
Answer: To ensure fuel quality has not degraded and that adequate fuel is
available to sustain generator operation for the required runtime during an
extended outage.
Q14. What is the purpose of power monitoring and alarm systems tied
to facility power equipment?
Answer: To alert facility personnel of power system status changes, such
as a transfer to generator power, low battery, or a rectifier failure, allowing
prompt response.
(BTCS)
Facilities Section Exam
Questions & Answers
Covers the facility power systems (utility, standby generators, UPS, batteries), grounding and
bonding, HVAC and environmental control, fire suppression and life safety, facility safety/codes
and hazard awareness, physical plant security and monitoring, reliability/redundancy/standards
compliance and more.
,Q1. What is the primary purpose of a standby generator at a headend or
hub facility?
Answer: To provide continued electrical power to the facility during an
extended utility power outage, maintaining service reliability.
Q2. What is the typical fuel source difference between a 'standby'
generator and a 'prime power' generator?
Answer: A standby generator is sized and rated for intermittent, emergency
backup use, while a prime power generator is designed to run continuously
as the primary power source.
Q3. What is an Automatic Transfer Switch (ATS) used for in a facility
power system?
Answer: To automatically switch the electrical load from utility power to
standby generator power (and back) when a utility outage is detected.
Q4. Why is it important to perform regular load-bank testing on a
standby generator?
Answer: To verify the generator can actually handle its rated load under
real conditions, since running with little or no load for testing alone may not
reveal problems that occur under full load.
Q5. What is the function of an Uninterruptible Power Supply (UPS) in a
headend facility?
Answer: To provide immediate, uninterrupted power to critical equipment
during the transition period between a utility outage and generator startup,
and to condition power against fluctuations.
Q6. What are the two common UPS topologies used in cable facilities?
Answer: Standby (offline) UPS and online (double-conversion) UPS.
Q7. Why might an online (double-conversion) UPS be preferred over a
standby UPS for critical headend equipment?
Answer: Because an online UPS continuously supplies power through the
inverter with no transfer time, providing cleaner and more consistent power
with zero switchover gap.
, Q8. What is the purpose of battery strings in a DC power plant used in a
headend?
Answer: To supply reserve DC power to equipment in the event of an AC
power interruption, bridging the gap until generator power is established or
the outage ends.
Q9. What type of battery is most commonly used in
telecommunications standby power plants?
Answer: Valve-regulated lead-acid (VRLA) batteries, though flooded
lead-acid and increasingly lithium-ion batteries are also used.
Q10. Why is proper ventilation important in a room containing flooded
lead-acid batteries?
Answer: Because charging can produce hydrogen gas, which is flammable
and must be adequately vented to prevent a buildup that could pose an
explosion risk.
Q11. What does 'reserve time' or 'reserve capacity' refer to in a battery
backup system?
Answer: The length of time the batteries can supply power to the connected
load before being depleted.
Q12. What is a rectifier's role in a DC power plant?
Answer: To convert incoming AC utility power into DC power used to run
equipment and charge the battery string.
Q13. Why should standby generator fuel supplies be regularly
inspected and maintained?
Answer: To ensure fuel quality has not degraded and that adequate fuel is
available to sustain generator operation for the required runtime during an
extended outage.
Q14. What is the purpose of power monitoring and alarm systems tied
to facility power equipment?
Answer: To alert facility personnel of power system status changes, such
as a transfer to generator power, low battery, or a rectifier failure, allowing
prompt response.
