Structured Cabling T1 Flashcards
A BNC connector is used most commonly for data applications when using what type of wiring and/or cabling?
B. Coaxial
What code standard is used for bonding requirements?
a. NEC Article 250
What is the purpose of firestop products?
To stop the spread of fumes and contain fire.
What are the frequency bandwidths for the following cable categories?
Cat 5e: 100mHz; Cat 6: 250mHz; Cat 6A: 500mHz
What are some things that you can do to a communications cable that will decrease the performance of the cable?
Kink, flatten, over-bend, tie-wrap too tightly
What is the minimum bend radius for 4 pair UTP cable under no load with a diameter of 1/4”?
1”
When is it permissible for communications cable to share a cable tray with conductors for power and lighting?
As barriers for separation
Why is the location of the equipment rooms important to the performance of the equipment and wiring?
Central location and size of room
What is the ANSI/TIA/EIA requirement for pull boxes?
Length is over 100, more than 2 90° bends, U-shaped bend in run.
A second telecommunications room shall be added when the area to be served exceeds ___ and they shall be connected by a ___ firestopped conduit.
Answers: 295ft and 3”
What are the quantities of 4-paire cables that can be terminated on a 66 block and a 100 block?
12 pair and 24 pair
Structured cabling is designed and installed according to the ____ topology
STAR
What causes attenuation to increase in a twisted pair cable?
longer cable, greater attenuation
What is the difference between a UTP cross-connect wire and UTP patch cord?
The pin outs on the end
In a telecommunication room, what are the requirements for plywood coverage and ground?
6 guage stranded copper and a grounding bus bar
All metallic cable shields and metallic elements of fiber optic cables should be grounded no more than 50ft from the entry point of the cable/fiber.
50 feet
What is the purpose of twisting a pair of wires in a cable assembly?
decrease crosstalk
Define the following terms: Attenuation NEXT Crosstalk Capacitive Coupling
Attenuation: Insertion loss - signal loss over a distance.
NEXT: Causes undesired leakage from transit pair “crosstalk” onto near-end receive pair of cabling.
Crosstalk: Unwanted reception of signals induced on a communication line.
Capacitive Coupling: Same twist lengths/transfer of energy.
What does the Intra-Building Backbone Pathway Sleeve Method require per 40,000 sq ft of usable floor space:
five 4” sleeves
What is the purpose of telecommunications electrical protection devices:
Protect the equipment and property from voltage spikes and current.
How is fiber optic bandwidth measured?
Hertz/Meter
How many pairs are there in each binder group of a multi-pair UTP cable?
25 pair
