BROADBAND PREMISES TROUBLESHOOTING 1 QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+
True or False: Communication signals travel faster over coax than over
unshielded twisted pair. Ans✓✓✓true
Match the following utility colors: Ans✓✓✓sewer/drain, green;
reclaimed water, irrigation & slurry, purple; electric, red; gas, oil, steam,
petroleum, yellow; telecomm, orange; water, blue; pending work, white;
temporary markout, pink
The federal government mandates the amount of ___ signal that is
allowable by cable networks. Ans✓✓✓egress
True or False: Ideally, leakage should be checked at only a single
frequency that does not coincide with any aircraft/aeronautical bands.
Ans✓✓✓false
True or False: Power over Ethernet can be tested with a standard
Ethernet/LAN tester. Ans✓✓✓false
What is the main thing a time domain reflectometer tests?
Ans✓✓✓impedance mismatches
What is the main thing signal level meter tests? Ans✓✓✓rf power levels
,What is the main thing a cable locator can be used for? Ans✓✓✓finding
buried cable
What is the main thing a brown meter tests? Ans✓✓✓polarity
What is the main thing a foreign voltage detector tests?
Ans✓✓✓presence of dangerous AC voltages
True or False: MER is not sensitive to CTB/CSO distortions.
Ans✓✓✓false
True or False: Phase noise in the constellation diagram indicates a
problem at the customer premises. Ans✓✓✓false
Why is it a good idea to test all home outlets rather than just the ones to
which devices are currently connected? Ans✓✓✓to let the cx move
devices if they wish, to locate any splitters/amps that could be affecting
the signal, to allow the cx to add services potentially without requiring a
service visit
True or False: Measurement in the customer premises of ripple in the
channel response due to micro-reflections requires a spectrum analyzer
mode in your H-DSA or SLM. Ans✓✓✓true
, True or False: When locating faults with a TDR, it does NOT matter
what kind of cable is being tested. Ans✓✓✓false
What are the 4 main tests or measurements that can be made on a VOM?
Ans✓✓✓voltage DC/AC, shorts, ground faults and polarity
What are three common cable problems that lead to reflections?
Ans✓✓✓crimps, kinks or compressed cable; water or moisture; sheath
faults or cuts
True or False: An abnormally high number of pre-FEC errors are
acceptable as long as the post-FEC errors are within specification.
Ans✓✓✓false
True or False: It is not possible to have a zero BER when uncorrectable
codeword errors are present. Ans✓✓✓true
Order the steps for the general guidelines in using the triangulation
method to identify a leak. Ans✓✓✓position the dipole antenna parallel
to the ground; rotate the antenna 360* while looking for peak value of
leak in position 1; note the direction of antenna when leakage value
peaks for position 1; walk 30' parallel t source of leak; rotate the antenna
360* while looking for peak value of leak in position 2; note the
direction of antenna when leakage value peaks in position 2; the
intersection of the triangle is the source of the leak
AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+
True or False: Communication signals travel faster over coax than over
unshielded twisted pair. Ans✓✓✓true
Match the following utility colors: Ans✓✓✓sewer/drain, green;
reclaimed water, irrigation & slurry, purple; electric, red; gas, oil, steam,
petroleum, yellow; telecomm, orange; water, blue; pending work, white;
temporary markout, pink
The federal government mandates the amount of ___ signal that is
allowable by cable networks. Ans✓✓✓egress
True or False: Ideally, leakage should be checked at only a single
frequency that does not coincide with any aircraft/aeronautical bands.
Ans✓✓✓false
True or False: Power over Ethernet can be tested with a standard
Ethernet/LAN tester. Ans✓✓✓false
What is the main thing a time domain reflectometer tests?
Ans✓✓✓impedance mismatches
What is the main thing signal level meter tests? Ans✓✓✓rf power levels
,What is the main thing a cable locator can be used for? Ans✓✓✓finding
buried cable
What is the main thing a brown meter tests? Ans✓✓✓polarity
What is the main thing a foreign voltage detector tests?
Ans✓✓✓presence of dangerous AC voltages
True or False: MER is not sensitive to CTB/CSO distortions.
Ans✓✓✓false
True or False: Phase noise in the constellation diagram indicates a
problem at the customer premises. Ans✓✓✓false
Why is it a good idea to test all home outlets rather than just the ones to
which devices are currently connected? Ans✓✓✓to let the cx move
devices if they wish, to locate any splitters/amps that could be affecting
the signal, to allow the cx to add services potentially without requiring a
service visit
True or False: Measurement in the customer premises of ripple in the
channel response due to micro-reflections requires a spectrum analyzer
mode in your H-DSA or SLM. Ans✓✓✓true
, True or False: When locating faults with a TDR, it does NOT matter
what kind of cable is being tested. Ans✓✓✓false
What are the 4 main tests or measurements that can be made on a VOM?
Ans✓✓✓voltage DC/AC, shorts, ground faults and polarity
What are three common cable problems that lead to reflections?
Ans✓✓✓crimps, kinks or compressed cable; water or moisture; sheath
faults or cuts
True or False: An abnormally high number of pre-FEC errors are
acceptable as long as the post-FEC errors are within specification.
Ans✓✓✓false
True or False: It is not possible to have a zero BER when uncorrectable
codeword errors are present. Ans✓✓✓true
Order the steps for the general guidelines in using the triangulation
method to identify a leak. Ans✓✓✓position the dipole antenna parallel
to the ground; rotate the antenna 360* while looking for peak value of
leak in position 1; note the direction of antenna when leakage value
peaks for position 1; walk 30' parallel t source of leak; rotate the antenna
360* while looking for peak value of leak in position 2; note the
direction of antenna when leakage value peaks in position 2; the
intersection of the triangle is the source of the leak
