Page 1 of 149
New Mexico (NM) ES-7J Journeyman Telephone
Communication & Telephone Interconnect
Systems Exam QUESTIONS AND VERIFIED
ANSWERS WITH RATIONALES JUST RELEASED
New Mexico (NM) ES-7J Journeyman Telephone Communication & Telephone Interconnect Systems
Exam
10 MOSTLY TESTED EXAM COVERAGE AREAS
1. Telephone Communication Systems — telephone circuits, subscriber lines, central office
connections, telephone equipment, line characteristics, polarity, ringing voltage, and basic
telephone operation.
2. Telephone Interconnect Systems — PBX systems, key systems, extensions, trunks, station
wiring, demarcation points, cross-connects, and equipment connections.
3. NEC Communications Requirements — communications circuits, separation from power wiring,
raceways, cable installation, protection, grounding, bonding, and applicable NEC requirements.
4. New Mexico Electrical Code Requirements — New Mexico electrical requirements affecting
communications installations, approved wiring methods, equipment, inspection, and code
compliance.
5. Communication Cable and Wiring Methods — twisted-pair cable, coaxial cable, Category-rated
cable, connectors, terminals, patch panels, cable support, labeling, and cable routing.
6. Grounding, Bonding, and Surge Protection — grounding conductors, bonding, grounding
electrodes, protectors, lightning protection, surge protection, and protection of communication
equipment.
7. Installation and Construction Practices — cable pulling, bending, fastening, supports,
penetrations, firestopping, raceways, cabinets, enclosures, and workmanship.
8. Testing, Troubleshooting, and Maintenance — continuity testing, resistance, shorts, opens,
grounds, cross-talk, noise, signal problems, fault isolation, and repair procedures.
9. Data and Structured Cabling Fundamentals — Ethernet, UTP/STP, Category 5e/6/6A concepts,
patch panels, termination, cable performance, and basic network communication.
10. Safety, Tools, Standards, and Job Practices — safe work procedures, ladders, electrical hazards,
test equipment, personal protective equipment, documentation, code books, and proper
installation practices.
1.
, Page 2 of 149
A technician is installing a new telephone line between a building entrance and an office extension.
What is the main purpose of the telephone pair?
A. Carry only grounding current
B. Carry the communication signal between telephone equipment
C. Supply building lighting power
D. Operate the fire sprinkler system
Answer: B
Rationale: A telephone pair provides the conductors needed to carry voice and signaling information
between telephone equipment.
2.
When installing communication cable near electrical power conductors, what is the main reason for
maintaining proper separation between them?
A. To make the cable easier to label
B. To increase telephone ringing volume
C. To reduce interference and maintain safe installation conditions
D. To increase the number of telephone extensions
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Answer: C
Rationale: Separation helps reduce electromagnetic interference and provides the required protection
between communications and power circuits.
3.
A technician needs to connect several telephone lines to equipment in a central wiring location. Which
device is commonly used for organized terminations?
A. Cross-connect block
B. Circuit breaker
C. Transformer
D. Motor starter
Answer: A
Rationale: Cross-connect blocks provide an organized location for terminating and connecting telephone
conductors.
4.
What does the abbreviation PBX most commonly mean in a telephone communication installation?
, Page 4 of 149
A. Public Branch Transmitter
B. Private Branch Exchange
C. Primary Broadband Extension
D. Personal Building Exchange
Answer: B
Rationale: PBX means Private Branch Exchange and provides telephone switching services for an
organization.
5.
A telephone cable has one conductor broken somewhere between the equipment and the outlet. What
type of fault is present?
A. Short circuit
B. Ground fault
C. Open circuit
D. Reversed polarity
Answer: C
Rationale: A broken conductor creates an open circuit because electrical continuity is interrupted.
New Mexico (NM) ES-7J Journeyman Telephone
Communication & Telephone Interconnect
Systems Exam QUESTIONS AND VERIFIED
ANSWERS WITH RATIONALES JUST RELEASED
New Mexico (NM) ES-7J Journeyman Telephone Communication & Telephone Interconnect Systems
Exam
10 MOSTLY TESTED EXAM COVERAGE AREAS
1. Telephone Communication Systems — telephone circuits, subscriber lines, central office
connections, telephone equipment, line characteristics, polarity, ringing voltage, and basic
telephone operation.
2. Telephone Interconnect Systems — PBX systems, key systems, extensions, trunks, station
wiring, demarcation points, cross-connects, and equipment connections.
3. NEC Communications Requirements — communications circuits, separation from power wiring,
raceways, cable installation, protection, grounding, bonding, and applicable NEC requirements.
4. New Mexico Electrical Code Requirements — New Mexico electrical requirements affecting
communications installations, approved wiring methods, equipment, inspection, and code
compliance.
5. Communication Cable and Wiring Methods — twisted-pair cable, coaxial cable, Category-rated
cable, connectors, terminals, patch panels, cable support, labeling, and cable routing.
6. Grounding, Bonding, and Surge Protection — grounding conductors, bonding, grounding
electrodes, protectors, lightning protection, surge protection, and protection of communication
equipment.
7. Installation and Construction Practices — cable pulling, bending, fastening, supports,
penetrations, firestopping, raceways, cabinets, enclosures, and workmanship.
8. Testing, Troubleshooting, and Maintenance — continuity testing, resistance, shorts, opens,
grounds, cross-talk, noise, signal problems, fault isolation, and repair procedures.
9. Data and Structured Cabling Fundamentals — Ethernet, UTP/STP, Category 5e/6/6A concepts,
patch panels, termination, cable performance, and basic network communication.
10. Safety, Tools, Standards, and Job Practices — safe work procedures, ladders, electrical hazards,
test equipment, personal protective equipment, documentation, code books, and proper
installation practices.
1.
, Page 2 of 149
A technician is installing a new telephone line between a building entrance and an office extension.
What is the main purpose of the telephone pair?
A. Carry only grounding current
B. Carry the communication signal between telephone equipment
C. Supply building lighting power
D. Operate the fire sprinkler system
Answer: B
Rationale: A telephone pair provides the conductors needed to carry voice and signaling information
between telephone equipment.
2.
When installing communication cable near electrical power conductors, what is the main reason for
maintaining proper separation between them?
A. To make the cable easier to label
B. To increase telephone ringing volume
C. To reduce interference and maintain safe installation conditions
D. To increase the number of telephone extensions
, Page 3 of 149
Answer: C
Rationale: Separation helps reduce electromagnetic interference and provides the required protection
between communications and power circuits.
3.
A technician needs to connect several telephone lines to equipment in a central wiring location. Which
device is commonly used for organized terminations?
A. Cross-connect block
B. Circuit breaker
C. Transformer
D. Motor starter
Answer: A
Rationale: Cross-connect blocks provide an organized location for terminating and connecting telephone
conductors.
4.
What does the abbreviation PBX most commonly mean in a telephone communication installation?
, Page 4 of 149
A. Public Branch Transmitter
B. Private Branch Exchange
C. Primary Broadband Extension
D. Personal Building Exchange
Answer: B
Rationale: PBX means Private Branch Exchange and provides telephone switching services for an
organization.
5.
A telephone cable has one conductor broken somewhere between the equipment and the outlet. What
type of fault is present?
A. Short circuit
B. Ground fault
C. Open circuit
D. Reversed polarity
Answer: C
Rationale: A broken conductor creates an open circuit because electrical continuity is interrupted.
