Telephone Home Wiring
When installing a modular telephone jack by mounting and wiring the jack using a screw-down post at the customer prmises, how much insulation should be stripped from each individual copper conductoer with a wire stripper?
1/2-inch to 3/4-inch
On particualr concern for a VoIP customer with a home security system is the loss of power because
A VoIP system without proper battery-backup can cause alarm system owners to lose their monitoring capability.
you are using a 77HP tone generator in the Off/Polarity position to test a telephone line for voltage and polarity. You read the light emitting diode (LED) color to interpret theline status and line polarity and notice that the LED is bright green. What does a bright green LED indicate when testing a telephone line for voltage and plarity?
A clear working line with correct polarity.
Topology refers to the arrangement used in routing and connecting inside wiring to the network interface device (NID) or distribution device. How is the star topology arranged?
A seperate twisted-pair cable is routed to each modualr jack from the NID.
Which of the following scenarios describes the hybrid wiring topology?
A three-bedroom house: The master bedroom telephone jack is connected directly to an embedded multimedia terminal adapter (EMTA). and bedrooms two and three are fed from the master bedroom telephone jack.
What is a limitation of using the shorted modular plug for testing the wiring of a modular connector?
A wiring error such as a transposition can go unidentified because each pair is terminating into the same value of resistence, which is a short.
In accordance with requirements set by the National Electrial Code (NEC), several different cable types can be used for residential inside wiring. What is a CM cable?
An unshielded twisted-pair cable used indoors.
To help avoid and identiry possible custmer premises equipment probles after a successful installation, the skilled VoIP installation technician will
Ask the customer about devices which might be connected to the POTS line, and inform the customer that these devises may not work with VoIP telephone service.
Commonly located in or close to the alamr panel, the RJ31X jack serves as a passive device
Between an alarm panel and the premises wiring to enable line seizures and outbound dialing in alarm conditions.
The telephone wiring is in the bus topology and the twisted-pair cable tester is connected at the embeded multimedia terminal adapter (EMTA). with the remote unit connected to the last outlet in the loop. If the tester indicates a wiring error, what is the quickest way to locate the incorrectly wired outlet?
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 untill the wiring error is identified.
Which wiring topology starts at the telephone distribtion device, uses one twisted-pair cable to route through a customer premises from one modular jack to the next, and terminates at the last modular jack location?
Bus
All telephone cables are labeled with either a level or category (CAT) number that designates teh cable's performance criteria. How do CAT-1, CAT-2, and CAT-3 cables compare to CAT-5E and higher cables?
CAT-1 through CAT-3 are used only for voice applications; CAT-5E and higher are used for voice and data.
Which type of twisted-pair inside-wiring installation tool accomodates the varying surface shapes of unshielded twisted-pair (UTP cables?
Cable stripper
When troubleshooting telephone service in the customer premises, what is the next step if there is no dial-tone voltage at the customer outlet?
Check for voltage at the embedded multimedia terminal device (EMTA). If no voltage is present. The problem is either the network signal entering the EMTA or the EMTA is bad.
The customer access side of the netowrk interface device (NID) is also referred to as the demarc, which marks the point in the network where
Corporate responsibility ends and customer responsibility begins.
What must be done before using a twisted-pair cable tester to diagnose unshielded twisted-pair (UTP) cable wired in the star topology inside the customer premises?
Disconnect all customer premises equipment (CPE) from all the Jack's in the customer premises.
The best way to prevent equipment incompatibility between a VoIP installation and home secity system starts with.
Ensuring the VoIP provider, the home security company, and the end user communicate with one another prior to installation.
Common devices that can be affected by a switch to VoIP telephony include
Facsimile machines, medical alert consoles, point of sale terminals, and hearing impaired service equipment.
Which type of modular telephone-line cord is preferable?
Factory manufactured.
A modular plug contains for-, six-, or eight-pin positions. Each position is numbered and is used to terminate a specific tip or ring wire from a quad or twisted-pair cable. How are the pins on a modular jack numbered?
From left to right with thelocking tab down.
A key step in avoiding VoIP installation problems iwth common devices is to
Have customers verify that all their devices work properly before beginning.
What is one operation to check after adding a new modular telephone jack?
Inbound call capability.
What will any short in the premises wiring or connected customer premises equipment (CPE) do to telephone or highspeed data (HSD) service in the premises network?
It will disable both services
What is the first step in prequlifying (i.e., inspecting and evaluating) a new customer's existing telephony service?
Locate all telephones and jacks
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.
The first step in testing wiring configurations is to determine which configuration you are testing. When testing the Universal Service Order Codes (USOC) wiring configuration, which of the following pairs is the default pair that is ready to test?
Pair 1 (pins 4 and 5)
The indicators on a twisted-pair cable tester include pass, reversal, open, short, miswire, and split pair. What does a pass status indicate?
Pass indicates that the twisted-pair cable connections are "pinned for stragith-through wiring and the connection is elecronically continuous withough open or short circuit condions.
Standared color codes are used to identify the tip wires and the ring wires in multiple pairs of wires. This ensure that the proper connections are made among wires, plugs, and jacks throughout the inside wiring system. What happens if a tip wire is connected to a ring pin?
Polarities are reversed, and the telephone circuit may not work properly.
The network interface device (NID) generally consists of two seperate compartments. Which of the follwing components are contained in the craft access area of the NID?
Service wire connections; cross-connect wire connections; grounding connections.
when drilling a hole through an exterior wall to route a telephone cable to the interior, how should the hole be drilled?
Sloped upward from the outside and just large enough for the diameter of the cable.
Which conection scheme needs to be followed in order for an alarm system to continue working after a VoIP installation?
The RJ31X jack is the first device that the twisted-pair wires from the EMTA are connected to.
in the telephone test set, placing the T/M switch in the "T" (talk) position establishes an off-hook condition for dialing and talking. What is an off-hook condition of a telephone?
The active, in use, state of a telephone.
If an RJ31X jack is improperly wired parallel and an alarm condition is present.
The alarm system dials out to the central station, but it cannot seize the line.
Telephone test sets can be used to troubleshoot and locate open and short circuits. To locate a short circuit, ope one side of the telephone line at any location and place the telephone test set in tehe loop--one lead connected to each side of the opened line. A lound click can be heard if the circuit is closed when troubleshooting which side of a fault?
The battery side of a fault.
Before using a twisted-pair cable tester it is a good idea to know wichi wiring scheme was used at the time the connectors were installed. If eith-pin connectors were used, what is the difference between the Universal Service Order Codes (USOC) wiring configuration and the T568A wiring configuration?
The configuration of pairs 3 and 4 are completly different.
When using an inductive amplifer probe to identiy a pai of wire, what is the purpose of shorting the lead of a tone-carrying pair?
The short cancels the induced tone on the pair of wires, thhus the correct pair is identified when the tone disappears.
To have the alarm panel isolate itself from the premises wiring and caputre the phone line to alert the central station in case of an alarm condition, the RJ31X jack reqires
The tip and ring from the EMTA be terminated to the greeen and red terminals in the RJ31X jack, and the premises wiring be terminated to the brown (tip) and grey (ring) terminals in the EMTA.
Inside wiring for residential buildings may use either quad station wire or twisted-pair wire. What is an advantage of using twisted-pair wire over quad station wire?
The twisted wires minimize induction and crosstalk from other wires in the same cable.
What are some advantages of using a twisted-pair cable tester to troubleshoot unshielded twisted-pair (UTP) cable in the customer premises?
The twisted-pair cable tester is designed specifically to test twisted-pair cable coninuity and its connections, as well as identify and diagnose wiring errors.
If a residence contains many moular jacks, a distribution device may be used in addition to the network interface device (NID). What components are contained in a distribution device?
Tip and ring screw or punch-down terminals, which are used to connect the inside wiring.
What is a predominant application for a wiremapper?
To certify the structured wiring in commercial bulidings.
When installing a new insulation displacement connector (IDC) jack at the c ustomer premises, why is it iportant tot ensure that the wire pairs are untwisted a maximum of 1/ inch?
To maintain CAT-5e electrical characteristics.
After mounting and wiring a new modular telephone jack in a star installation, where should the unsielded twisted pair (UTP) cable from the new modular jack be connected?
To the tip and ring screw terminals or insulation displacement connection (IDC) on the telephone distribution device.
when routing and attaching interior unshielded twisted-pair (UTP) cable, what is the minimum separation distance you should maintain between any telecommunications or data cable and electrical power conuctors?
Two inches.
How should a (DMM) be used to troubleshoot problems in the telephone home wiring?
Use the voltmeter function, both the network interface device (NID) and the embedded multimedia terminal device (EMTA) provide a steady on hook voltage.
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.
The progressive Electronics 468 modualr cable tester cand be used to test a modualr cable and its male plugs for faults. The condition and sequence order of the light emitting diodes (LED) on both the Progressive Electronics 468T 9tranismitter) and 468R (receiever) will indicate the test results. Which of the following test results is indicated by the green LEDs on both the 468T and 468R when they are sequencing out of order?
A transpesed-pair test result.
In addition to contacting their security company to ensure that VoIP telephony is compatible with their home security system, prior to installation homeownders should
Perform an alarm system test prior to having VoIP installed.
