AA1 LT2 Flashcards
What factors determine the sizing of pathways for cables?
Cable quantity, size, bend radius requirements, and allowance for growth
Where are in-floor conduit systems typically installed?
In concrete
What are cable trays and wireways used for?
To house, support and protect cables.
Do cable trays and wireways require dividing barriers?
Yes
How should the plywood be installed on the walls of the telecommunications closet?
Vertically, bottom edge six inches from the floor
What is the purpose of a slotted wall duct?
Cable flexibility, neat installation
What is one method for supporting vertical backbone cable runs over long distances?
Steel ‘messenger’ cable
What is electromagnetic interference (EMI) and how can it affect a circuit?
EMI can disrupt information flow and cause circuit failure
What is the importance of keeping connections to a minimum in installations?
Reduces performance degradation
What is the Type 66 connecting block system used for?
Connect voice or data wiring to customer premise equipment
What type of modular jack assemblies mount in BIX mounts?
Categories 3, 5, and 5e
How are tip conductors identified?
Different colors from ring conductors
How much cable should be untwisted to make a connection in order to maintain data rate?
Least amount necessary
What type of wire can modular jacks accommodate?
Both solid and stranded
What is the first step in terminating modules?
Hold tool perpendicular to module and terminate.
What are the two primary choices for grounding in a building?
Building ground electrode system or accessible electrical service ground
What is the minimum thickness of a Bus bar?
6 mm (0.23 in.)
Where should a grounding bus bar be installed?
Telecommunications closets with many connections
What protective measures should be followed for backbone cable protection?
Avoid routing near electrical power cables, route near the middle of the building, install lightning protection, ground other cables
What does the length test measure?
Ensure maximum link distance not exceeded
What are the three types of crosstalk that concern cable installers?
NEXT, FEXT, ANEXT
What is EL-FEXT?
Equal level far end crosstalk
What are the two main components of a cable tracer?
Signal generator and signal receiver
What is a wireway?
A trough with hinged or removable covers.
What should be avoided when using nylon cable ties?
Tying too tightly around the cable bundle
Why should staples not be used with Cat 5 cable?
Can cause crimped wire or insulation damage
How much spare wire should you leave at outlets and connection points?
About 450 cm (18 in.)
How many conductors may be terminated in each contact slot?
One.
What type of wire is the Type 66 Connecting Block designed to terminate?
22-26 AWG solid copper wire
What does the labeling on the termination block allow for?
Identification and easy visual inspection.
What is the recommended maximum untwisting for Category 3 cable?
3 inches (7.62 cm)
At Category 5e levels, what must the connectors be specially configured to reduce?
Near-end crosstalk (NEXT)
After trimming off excess jacket, what is the next step in terminating modules?
Press protective cap onto top of module, until it snaps.
What do the data connector faceplates contain?
Both the data connector and one or more standard modular jacks
What is the normal minimum AWG size for copper conductors in commercial buildings?
6 AWG
What is the minimum width of a Bus bar?
100 mm (4 in.)
What is the purpose of installing a bonding conductor along each backbone cable pathway?
To ensure proper bonding and grounding
What does the attenuation test measure?
Signal loss from end to end
What is ANEXT?
Crosstalk between adjacent cables
What is propagation delay?
The time required for a signal to travel from one end of the transmission path to the other.
How can noise be mitigated in cabling?
Separate Voice and Data Cross-connect fields, No Split Pairs, Maintain Cable Pair Twist
What is the recommended inside radius of a bend in conduit?
At least six times the internal diameter of the conduit.
What problems can arise if nylon cable ties are wrapped too tightly?
Signal loss in fibre, crosstalk in Cat 5
