FIELD TECH 2 TO 3 FINAL EXAM ACTUAL QUESTIONS AND
ANSWERS GUARANTEE A+
✔✔Which DOCSIS layer is used by the CMTS to differentiate
between cable modems? - ✔✔The Docsis MAC layer
✔✔What was introduced in DOCSIS 3.0 to allow enough
bandwidth for upstream carriers from previous DOCSIS
versions? - ✔✔The option to increase the top frequency of the upstream to 85
MHZ.
✔✔In a DOCSIS network, why is the data throughput over the return or upstream path
typically less than the throughput of data over the forward or downstream path? -
✔✔Compared to the downstream path, the narrower bandwidths
and lower orders of modulation used to transport data over the
return path cause the downstream and upstream data
throughput to be unequal or asymmetrical.
✔✔What would be the downstream throughput if two QAM
channels with a throughput of 38 Mbps were bonded? - ✔✔76 Mbps.
✔✔What are two features that were added in DOCSIS 3.1 to
extend the viability of HFC networks into the next decade? - ✔✔OFDM and LDPC.
✔✔Which step in the troubleshooting process requires a
discussion with the customer to gather more detail about the
problem? - ✔✔Step 1: Identify the problem.
✔✔When analyzing a problem, what can the technician learn by
asking the customer to show or demonstrate the problem? - ✔✔The symptoms of the
problem can be viewed and any unusual screens or customer entries can be identified.
✔✔When using a digital signal analyzer to troubleshoot data
throughput im the DOCSIS network, what is the minimum MER
into the cable modem for a 256-QAM carrier? - ✔✔32 dB or greater
✔✔How should the digital multimeter (DMM) be used to troubleshoot problems in the
telephone wiring? - ✔✔Use tie voltmeter fumction, both the network interface device
(NID) and the embedded multimedia terminal adapter (EMTA)
provide a steady On-hook voltage.
✔✔If the telephone wiring is in the bus topology and the twisted-pair cable tester is
connected at the embedded multimedia terminal adapter (EMTA) with the remote unit
, connected to the last outlet in the loop, what is the quickest way to locate the incorrectly
wired outlet if the tester indicates a wiring error? - ✔✔Break the loop into smaller
sections and retest the two sections to identify which one has the wiring error. Continue
to divide the section with the error into smaller sections until the wiring error is identified.
✔✔After resolving the problem with the premises wiring issue, which of the following is
the next step in the six-step process that the technician should take? - ✔✔Verify that the
problem has been resolved and that phone service
is running perfectly on all phones.
✔✔In unshielded twisted-pair (UTP) cable, what is the term that
describes when an information-carrying conductor makes
contact with a grounded conductor? - ✔✔ground fault
✔✔How is silver satin cable used to connect telephone
equipment to wall outlets typically pinned? - ✔✔D) Reversed at opposite ends, or cross-
pinned.
✔✔What is the difference between the wiring configurations for a
residential, 8-position, 8-contact (8P8C) modular plug and jack
in the Universal Service Order Codes (USC) and
ANSI/TIA/EIA 570-B? - ✔✔The placement of pair numbers 3 and 4.
✔✔What should be checked as a possible cause of hum on a
customer's telephone line? - ✔✔Shielding problems in the station wiring, poor
terminations, or poor grounding and bonding connections.
✔✔In the customer premises, what could cause some dual tone
multifrequency (DTMF) touch-tone telephones to have
continuous dial tone caused by polarity reversal, but not other
DTF telephones? - ✔✔The telephone wiring polarity is incorrect, and the customer has
a
mix of older and newer DTMF touch-tone telephones.
✔✔What is the likely problem when there is dial tone on one
phone connected to an outlet, but not on two other phones
connected to two different outlets? - ✔✔An open circuit caused by a break in a
conductor, poor contact in a modular connector, or an incorrect wire connection.
✔✔A customer reports a problem of no dial tone (NDT). Upon
inspection, the technician notices that new carpeting has been
installed. What should the technician do next? - ✔✔Look for a cable that runs under the
carpet; it is likely that the cable has a short from the carpeting tack strip.
ANSWERS GUARANTEE A+
✔✔Which DOCSIS layer is used by the CMTS to differentiate
between cable modems? - ✔✔The Docsis MAC layer
✔✔What was introduced in DOCSIS 3.0 to allow enough
bandwidth for upstream carriers from previous DOCSIS
versions? - ✔✔The option to increase the top frequency of the upstream to 85
MHZ.
✔✔In a DOCSIS network, why is the data throughput over the return or upstream path
typically less than the throughput of data over the forward or downstream path? -
✔✔Compared to the downstream path, the narrower bandwidths
and lower orders of modulation used to transport data over the
return path cause the downstream and upstream data
throughput to be unequal or asymmetrical.
✔✔What would be the downstream throughput if two QAM
channels with a throughput of 38 Mbps were bonded? - ✔✔76 Mbps.
✔✔What are two features that were added in DOCSIS 3.1 to
extend the viability of HFC networks into the next decade? - ✔✔OFDM and LDPC.
✔✔Which step in the troubleshooting process requires a
discussion with the customer to gather more detail about the
problem? - ✔✔Step 1: Identify the problem.
✔✔When analyzing a problem, what can the technician learn by
asking the customer to show or demonstrate the problem? - ✔✔The symptoms of the
problem can be viewed and any unusual screens or customer entries can be identified.
✔✔When using a digital signal analyzer to troubleshoot data
throughput im the DOCSIS network, what is the minimum MER
into the cable modem for a 256-QAM carrier? - ✔✔32 dB or greater
✔✔How should the digital multimeter (DMM) be used to troubleshoot problems in the
telephone wiring? - ✔✔Use tie voltmeter fumction, both the network interface device
(NID) and the embedded multimedia terminal adapter (EMTA)
provide a steady On-hook voltage.
✔✔If the telephone wiring is in the bus topology and the twisted-pair cable tester is
connected at the embedded multimedia terminal adapter (EMTA) with the remote unit
, connected to the last outlet in the loop, what is the quickest way to locate the incorrectly
wired outlet if the tester indicates a wiring error? - ✔✔Break the loop into smaller
sections and retest the two sections to identify which one has the wiring error. Continue
to divide the section with the error into smaller sections until the wiring error is identified.
✔✔After resolving the problem with the premises wiring issue, which of the following is
the next step in the six-step process that the technician should take? - ✔✔Verify that the
problem has been resolved and that phone service
is running perfectly on all phones.
✔✔In unshielded twisted-pair (UTP) cable, what is the term that
describes when an information-carrying conductor makes
contact with a grounded conductor? - ✔✔ground fault
✔✔How is silver satin cable used to connect telephone
equipment to wall outlets typically pinned? - ✔✔D) Reversed at opposite ends, or cross-
pinned.
✔✔What is the difference between the wiring configurations for a
residential, 8-position, 8-contact (8P8C) modular plug and jack
in the Universal Service Order Codes (USC) and
ANSI/TIA/EIA 570-B? - ✔✔The placement of pair numbers 3 and 4.
✔✔What should be checked as a possible cause of hum on a
customer's telephone line? - ✔✔Shielding problems in the station wiring, poor
terminations, or poor grounding and bonding connections.
✔✔In the customer premises, what could cause some dual tone
multifrequency (DTMF) touch-tone telephones to have
continuous dial tone caused by polarity reversal, but not other
DTF telephones? - ✔✔The telephone wiring polarity is incorrect, and the customer has
a
mix of older and newer DTMF touch-tone telephones.
✔✔What is the likely problem when there is dial tone on one
phone connected to an outlet, but not on two other phones
connected to two different outlets? - ✔✔An open circuit caused by a break in a
conductor, poor contact in a modular connector, or an incorrect wire connection.
✔✔A customer reports a problem of no dial tone (NDT). Upon
inspection, the technician notices that new carpeting has been
installed. What should the technician do next? - ✔✔Look for a cable that runs under the
carpet; it is likely that the cable has a short from the carpeting tack strip.
