Chapter 6 - Installing a Physical Network Flashcards
Define: Structured Cabling
Structured cabling is the critical set of standards used all over the world to install physical cabling in a safe and orderly fashion
Define: Cable run
Cabling that goes horizontal
Define: Stranded Core
A cable that is a bundle of tiny wire strands
Compare/contrast a solid core and stranded core
A solid core is a much better conductor but will break if handled to roughly or too often
A stranded core isn’t as good of a conductor but can withstand substantial handling without breaking
What is the unit of measurement for rack mounted equipment
U = unit
1 U = 1.75 inches
2U = 3.5 inches
….
What is the connector found in a patch panel
110 block or 110 punchdown block
From a cabling standpoint, what is a work area
Wall outlet that serves as a termination point
What does TIA/EIA 568 specify max cable lengths
90 meters
Define: Demarc
The physical location of the connection and marks the dividing line of responsibility for the functioning of the network
What is a Network Interface Unit (NIU)
The modem supplied by an ISP
What special feature does an NIU possess
Also known as Smart Jacks, they can set up a remote loop back to test for a connection when you’re miles away
Define: Customer Premises Equipment
Found after the NIU, this acts as the primary distribution tool for the building.
For telephones - multiplexer
For LAN - Switch
Define: Demarc Extension
The cabling that runs from the NIU to the CPE.
Define: Main distribtion frame
The combination of demarc, telephone cross-connects, and LAN cross connects
Define: Cable drop
the location where the cable comes out of the wall
What are the Five issues to keep in mind when deciding the location of the telecommunications room
Distance - has to be within 90 meters of cable drops
Power - preferebly on its own dedicated circuit
Humidity - the reason should be obvious
Cooling
Access - keep unwanted people out of it
When pulling cable where should a installer start
the telecommunications room
How is signal loss measured
Decibels
Define: Attenuation
The weakening of signal as it travels long distance
Define Dispersion
When a signal spreads out over long distances.
Define: Bend radius limitation
when a fiber cable is bent too much and you get light leakage.
What is wavelength mismatch and why is it relevant
fiber cables use different wavelengths and if a signal starts at 1310 and the switch expects 1530 the transmission will stop cold.
What is a Optical Time domain Relectometer
OTDRs are used to determine continuity and if there is a break. They can tell you how far down the cable the break is.
What are the three big issues with fiber
Attenuation, light leakage, and modal distortion.
