1.Trunks Are Usually Available for Use by More Than One Subscriber. A

PBL Telecommunications2002 NLC

Indicate whether the sentence or statement is true or false. Mark "A" if the statement is True or "B" if it is False.

1.Trunks are usually available for use by more than one subscriber. A

2.IP is a connection-oriented protocol. B

3.Prior to 1996, all local telephone companies were prohibited from providing long distance services. B

4.Though ATM may detect errors in the data stream, responsibility for error detection is left to upper layer protocols. A

5.CRC is a method of encapsulating data for security purposes. B

6.Single mode fiber must be used to transport SONET level signals. B

7.Frame Relay services are typically billed according to throughput and distance. B

8.The local loop is the greatest limiting factor in increasing bandwidth to the home and business. A

9.Frame Relay is most suited to data transmission that is highly predictable, static in throughput, and real time in application. B

10.ISDN channels that carry information are multiples of 56kbps. B

Mark the correct answer on your Scantron sheet for each of the following questions.

11.The document regulated telephone companies file with the FCC or PUC to define new services is called a B

1. service order.
2. tariff.
3. board filing.
4. request for service.

12.Which government agency did the Communications Act of 1934 create? A

1. Federal Communications Commission
2. National Telecommunications Board
3. Utilities and Telephone Oversight Committee
4. U.S. Department of Communications

13.______&______were the two inventors who are associated with the invention of the telephone. A

1. Bell, Gray
2. Bell, Strowger
3. Bell, Edison
4. Bell, Marconi

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14.What was the name of the legal ruling that required AT&T to “divest” itself into several Bell Operating Companies? D

1. The Telecommunications Act of 1983
2. The Consent Decree of 1956
3. Specialized Common Carrier Decision
4. The Modified Final Judgment of 1984

15.Which of the following stimulated competition in the local telephone network?B

1. The Modified Final Judgment of 1984
2. The Telecommunications Reform Act of 1996
3. FCC vs. Bell Atlantic
4. Consent Decree of 1952

16.The acronym used to identify a local telecommunications company that directly competes with the local incumbent is D

1. IEC.
2. ILEC.
3. CPOP.
4. CLEC.

17.Which of the following is not a step in the process to convert from analog to digital in a PCM/TDM system? B

1. Sampling
2. Amplifying
3. Companding
4. Quanitizing

18.In PCM, the process of “rounding off” is called A

1. quantizing.
2. quantifying.
3. companding.
4. incrementing.

19.In the local telephone plant, load coils are used D

1. to increase signal quality by amplifying the signal.
2. to make the cable appear longer than it really is.
3. to dissipate electronic impulses caused by stray voltage.
4. to reduce mutual capacitance by increasing inductance.

20.Which of the following provides 4 wire equal access trunking to all Interexchange Carriers? D

1. Feature Group A
2. Feature Group B
3. Feature Group C
4. Feature Group D

21.A ______is a privately owned and operated, feature rich telephone switch commonly found in large businesses. A
a. PBX

1. PTU
2. KSU
3. KTS

1. Which of the following terms describes a network that completes all attempted calls? D
2. Blocking
3. Anonymous Call Rejection
4. Free Terminating
5. Non-blocking

1. ______is used in traffic engineering and is also known as “Lost Calls Cleared.” B
2. Poisson
3. Erlang B
4. Busy Hour Tables
5. Call Rejection Analysis

1. Using the even count color code, which colors represent the tip wires? D
2. Blue, Orange, Green, Brown, Slate
3. White, Black Violet, Pink
4. Black, Red, Green, Yellow
5. White, Red, Black, Yellow, Violet

1. A telephone feature that allows an incoming caller to select menu options following a voice greeting is called C
2. AAR.
3. PBX.
4. IVR.
5. Voice Recognition.

1. The load balancing systems used in call centers to spread the workload evenly are called C
2. ACR.
3. ANI.
4. ACD.
5. DAL.

1. In an SS7 network, a telephone switch is referred to as a A
2. SSP.
3. STP.
4. SCP.
5. TCP.

1. There are ______layers to the SS7 protocol stack. C
2. 7
3. 5
4. 4
5. 3

1. A T1 transmits information at what rate? B
2. 1.54 Mbps
3. 1.544 Mbps
4. 384 Kbps
5. 768 Kbps

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PBL Telecommunications2002 NLC

1. In a T1, the framing bit is sometimes referred to as the A
2. 193rd bit.
3. alpha bit.
4. start stop bit.
5. final bit.

1. In bit robbed signaling, the least significant bit from which D4 frames are used for supervisory signaling are A
2. six and twelfth.
3. fourth and eighth.
4. every other.
5. none of the above.

1. The type of signaling used on the basic residential POTS line is called D
2. POTS signaling.
3. Ground Seize signaling.
4. Loop Around signaling.
5. Loop Start signaling.

1. A T1 channel bank is an example of a(n) B
2. bit mux.
3. byte mux.
4. CDM mux.
5. FDM mux.

1. In SONET, a VT1.5 can carry which of the following? A
2. One T1
3. Two T1s
4. One DS3
5. None of the above

1. In SONET, line overhead C
2. is associated with every optical path.
3. is associated with the end to end STS.
4. is associated from mux to mux.
5. none of the above

1. The most stable clock source used in synchronous telecommunications networks is referred to as A
2. Stratum 1.
3. telemetry.
4. plesiochronous.
5. mesochronous.

1. Modern Stored Program Control switches use ______to control multiple processes. C
2. common equipment controllers
3. simultaneous distribution
4. distributed processing
5. trunk access controllers

1. The concept of Equal Access provides all ______equivalent connections to the local exchange. D
2. CLECs
3. ILECs
4. CAPs
5. IECs

1. Which organization created the OSI reference model? d
2. ITU
3. EIA
4. ANSI
5. ISO

1. IBM’s network model, similar to OSI, is called B
2. Standard Network Architecture.
3. Systems Network Architecture.
4. IBM Systems Interconnect.
5. IBMnet.

1. SMTP (e-mail) would be an example of an OSI layer ____ protocol. B
2. 5
3. 7
4. 2
5. 4

1. The ______on the Internet are where national backbone providers exchange data. D
2. CPOPs
3. SSPs
4. Virtual POPs
5. NAPs

1. The decimal equivalent to the hexadecimal number 7E is C
2. 76.
3. 122.
4. 126.
5. 127.

1. HDLC is an example of an OSI layer _____ protocol. B
2. 1
3. 2
4. 3
5. 4

1. The IEEE specification detailing wireless local area network access is D
2. 802.1p.
3. 802.1q.
4. 802.7.
5. 802.11.

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PBL Telecommunications2002 NLC

1. In ASCII, how many data bits are used to represent data characters? D
2. 4
3. 5
4. 6
5. 7

1. A device on a network that obtains an IP address dynamically is using B
2. AARP.
3. DHCP.
4. NetBios.
5. DNIS.

1. The service that allows you to specify a URL instead of an IP address on the Internet is called C
2. DHCP.
3. IP NAT.
4. DNS.
5. NIC.

1. An ISDN circuit consists of a number of ______channels and a data channel. A
2. bearer
3. transmission
4. video
5. voice

1. VPN means B
2. Very Private Network.
3. Virtual Private Network.
4. Vulnerable Private Network.
5. Virtual Peering Nodes.

1. The term ______defines two-way simultaneous transmission. B
2. simplex
3. full duplex
4. di-synchronous
5. homogeneous

1. The 100 in100BaseT means C
2. the network can operate up to 100 meters between nodes.
3. the network operates at 100 Gigabits per second.
4. the network operates at 100 Megabits per second.
5. the network is limited to 100 clients per server.

1. The Internet standard that allows your local network to use private IP addresses that are not recognized by the public Internet is C
2. TCP/IP.
3. IEEE 802.5.
4. NAT.
5. IPv5.

1. ______is the DSL standard that combines DSL with your normal POTS line and requires low pass filters to be installed on all telephone sets. C
2. V.90
3. X.pots
4. G.Lite
5. HDSL

1. In SONET, which of the following is used to resolve timing differences? A
2. Pointers
3. Floating synchronizers
4. Virtual tributaries
5. Bit robbing

1. According to the North American Digital Hierarchy, how many VF channels can a DS3 carry? C
2. 24
3. 96
4. 672
5. 2048

1. The diameter of an individual strand of single mode fiber is A
2. 125 micrometers.
3. 10 micrometers.
4. 62.5 micrometers.
5. 50 micrometers.

1. The part of the PCM process that generates a binary code to represent the amplitude of a sampled analog signal is called D
2. sampling.
3. quanitizing.
4. digitizing.
5. encoding.

1. The SS7 network can only interface with A
2. SPC switches.
3. ATM switches.
4. electromechanical switches.
5. Class 5 switches.

1. An electronic key telephone system labeled “612” can handle a maximum of _____ CO lines and _____ station sets. B
2. 12; 6
3. 6; 12
4. 12; 600
5. 3; 6

1. TSI in digital switching stands for C
2. time selector interface.
3. transmission selection interchange.
4. time slot interchange.
5. tributary select interface.
6. Voice lines that connect the PSTN to a PBX are called B
7. loop start lines.
8. tie lines.
9. T1 lines.
10. Centrex.

1. Which of the following is a character-oriented protocol? A
2. Bisynchronous
3. HDLC
4. ADCCP
5. LLC

1. Which of the following techniques is used to achieve the relatively high speeds (~57.6 Kbps) seen in dial up modems? B
2. Bit stuffing
3. Compression
4. Differential amplitude modulation
5. BPSK

1. DCE is used to refer to C
2. digital communications equipment.
3. data carrier equipment.
4. data communication equipment.
5. dual channel equipment.

1. In the OSI reference model, which layer performs error detection and flow control? D
2. Application
3. Session
4. Network
5. Data Link

1. In what year was AT&T incorporated? A
2. 1885
3. 1876
4. 1877
5. 1906

1. In what year was the first commercial fiber optic telecommunication system installed? B
2. 1970
3. 1976
4. 1979
5. 1980

1. Which development during the 1980s led to significant change in the public telephone network? d
2. The wide scale deployment of microwave systems
3. Deregulation of the local loop
4. Development of digital subscriber line technology
5. The wide scale installation of fiber optic transport systems

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PBL Telecommunications2002 NLC

1. What development in 1993 gave the average person the ability to navigate the Internet? A
2. Mosaic
3. DSL
4. Bulletin Board Services
5. Lower long distance rates

1. Which of the following is not a PCS access technology? A
2. CSMA/CD
3. TDMA
4. E-TDMA
5. CDMA

1. In traffic engineering, what factor means the number of calls the system can handle during the peak hour of the day? C
2. Erlang
3. CCS
4. Busy Hour Call Attempts
5. Peak to Average Ratio

1. Which of the following data communications standards implement a standard cell size of 53 octets? B
2. Frame relay
3. ATM
4. ISDN
5. Ethernet

1. Which of the following standards has had the greatest impact on businesses decentralizing computing resources? A
2. IP
3. ISDN
4. Local deregulation
5. MFJ

1. Which of the following is not a service provided by ATM? C
2. UBR
3. CBR
4. TBR
5. VBR

1. Which of the following is the SONET architecture providing the most redundancy? B
2. Unidirectional Self Healing Ring
3. Bi-directional Self Healing Ring
4. Dynamic Non-hierarchical Switched Ring
5. Dual node switching

1. Which factor has prevented VoIP (Voice Over IP) toll bypass from being widely implemented? A
2. Latency
3. High Error Rates
4. Lack of available class C addresses
5. Inherent noise
6. Which of the following designates a subscriber's chosen long distance provider? D
7. Long Distance Designator
8. Dedicated Dialing Service Code
9. Direct Distance Dialing
10. Primary Interexchange Carrier Code

1. According to the OSI reference model, which device spans all 7 layers? D
2. Router
3. Server
4. VTAM
5. Gateway

1. Which class of IP addresses provides the greatest number of hosts, and is used on the largest networks? A
2. Class A
3. Class B
4. Class C
5. Class D

1. Which protocol identifies a host IP address on the LAN? D
2. DNS
3. UDP
4. TCP
5. ARP

1. What is a request through ICMP about another IP address called? C
2. Datagram
3. NAT
4. Ping
5. Pong

1. A device that scans images and sends the analog data over a telephone line is called a(n) B
2. OSP.
3. facsimile.
4. data recovery unit.
5. dialer.

1. A hunt group is best defined as B
2. allowing incoming calls to terminate simultaneously to multiple numbers.
3. allowing incoming calls to search through several numbers to terminate.
4. a group of numbers that all share the same office space.
5. evenly distributing calls based on designated criteria.

1. Which feature allows a subscriber to receive incoming calls from another central office at their current location? D
2. Three way calling
3. AMA billing
4. Direct distance dialing
5. Remote Call Forwarding

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PBL Telecommunications2002 NLC

1. Which piece of CPE must be used to terminate a T1 from the telephone company? C
2. NIU
3. NID
4. CSU
5. Channel Bank

1. What must be removed from the local loop in order to deploy service such as DSL? C
2. Bridge taps
3. Load coils
4. Both A & B
5. Neither A or B

1. What state level agency must a carrier be registered with to provide telecommunications services? C
2. FCC
3. Department of Commerce
4. Public Utilities Commission
5. Department of Revenue

1. DSL is an example of a layer ______protocol. A
2. 1
3. 2
4. 3
5. 4

1. In the 10 digit telephone number, the NPA corresponds to what is commonly referred to as B
2. the last four digits.
3. area code.
4. prefix.
5. none of the above.

1. What type of encoding is used in Ethernet? D
2. Winchester
3. Bipolar
4. NRZ
5. Manchester

1. A digital loop carrier would be used in all of the following situations except D
2. where there are insufficient pairs available in the field.
3. where call concentration is desired.
4. as a serving area interface using a high capacity fiber feed to the CO.
5. In rural areas to combine two phone lines onto one cable pair.

1. In bipolar AMI coding, when two binary ones of the same polarity are received consecutively, this is known as a C
2. bit stuffing.
3. insertion error.
4. bipolar violation.
5. collision.

1. The name of the local switch that provides Interexchange Carriers access to the local telephone network is known as the C
2. Sectional Switch.
3. SCP.
4. Access Tandem.
5. End Office.

1. What feature lets your system know which toll free or 900 number the incoming caller dialed to reach your system, and is used in conjunction with computer telephony equipment for call routing? B
2. DID
3. DNIS
4. ANI
5. DLCI

1. In public telephone network design, what document is referenced to describe a central office’s relationship to tandem switches? C
2. Switch Configuration Record (SCR)
3. PSTN Resource Guide
4. Local Exchange Resource Guide (LERG)
5. Local Dial Plan (LDP)

1. Which of the following tests will best determine if two wires of a cable pair have the same electrical characteristics? A
2. Longitudinal Balance
3. 3 tone slope
4. Envelope Delay Distortion
5. Noise to Ground

1. Which of following best describes the term M13? B
2. A modulator with a gain ration of 1:13
3. A multiplexer that combines DS1s into DS3
4. The ITU specification for voice over DSL
5. A modem that is equipped with 13 computer ports

1. Which of the following features is described as having a phone line from one location appearing at a separate, second location? B
2. OPD
3. OPX
4. RCD
5. ACT

1. A type of service that allows a customer to connect a T1 directly to the Interexchange Carrier, bypassing the LEC, for the purpose of long distance service in known as C
2. CPE.
3. IEC Direct.
4. Dedicated Access Line.
5. LD Access Direct.

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PBL Telecommunications2002 NLC

2002 PBL TELECOMMUNICATIONS ANSWER KEY

ANSWER / ANSWER / ANSWER / ANSWER
A / C / B / B
B / A / C / A
B / C / C / D
A / B / C / D
B / A / A / A
B / A / C / D
B / D / A / C
A / B / D / B
B / A / A / B
B / C / B / D
B / A / C / C
A / C / B / C
A / D / A / C
D / D / B / A
B / B / C / B
D / B / D / D
B / D / A / D
A / C / B / C
D / B / D / C
D / D / A / B
A / D / A / C
D / B / C / A
B / C / B / B
D / A / A / B
C / B / C / C

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