5-Minute Tech Quiz
Getting Power to the Camera
Test your Life Safety System Testing knowledge with the following quiz.
All answers may be found in NFPA 4.
1. What does the PoE Plus standard do?
A. Allows up to 77 volts on Cat 6
B. Doubles the amount of power to 25.5 watts
C. Allows for untwisted pair wiring
D. Triples power to 12.9 watts from the previous 4.3 watts
Feedback:
2. An asterisk (*) following the number or letter designating a paragraph indicates _____________.
A. 44 / 57 volts DC
B. 24 / 48 volts DC
C. 24 / 77 volts DC
D. 30 / 60 volts AC
Feedback:
3. Power loss and voltage drop is caused by ___________.
A. the cable’s resistance
B. the UL listing of the cable
C. installation errors
D. All of the above
4. Because electrical current flows in a loop, how many wires are used to deliver PoE power?
A. 2 wires
B. 2 pair of wires
C. 4 wires
D. 4 pair of wires
Feedback: 386.2
5. What class of power is used for a powered device (PD) such as an IP video camera?
A. 1
B. 2
C. 3
D. 4
6. What class of power is used for a powered device (PD) such as a VoIP telephone?
A. 1
B. 2
C. 3
D. 4
E. 0
Feedback:
7. Polarity is of critical importance in a PD’s power input circuitry.
A. True
B. False
8. The current version of the PoE standard is ___________?
A. 802.3at
B. 802.3af
C. TIA 568B
D. TIA 568A
Feedback:
9. A _______________ cable is one where one end is T568A configuration and the other is T568B configuration.
A. straight through
B. patch
C. crossover
D. hybrid
10. The most current edition of the Standard for Integrated Fire Protection and Life Safety System Testing is _____________.
A. Yes
B. No
Feedback: 2018
11. The most current edition of the Standard for Integrated Fire Protection and Life Safety System Testing is _____________.
A. 60o C
B. 60o F
C. 75o C
D. 75o F
12. The most current edition of the Standard for Integrated Fire Protection and Life Safety System Testing is _____________.
A. 568B
B. 802.3af
C. TSB-184A
D. 802.3at
Bonus Questions
In this photo, can you identify the ports that can be used for POE and those that can be used for fire alarm connections and why?
Click here to see the answer.
The obvious answer is that the ports circled in yellow are POE ports. Any of those may be used for providing power. Only two ports are designed for fire alarm service: ports 1 and 2 on the far left side of the device. Only those ports will operate during a power outage with a backup battery.
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