Chapter 5: Cabling
Suppose you're assisting with a cable installation using fiber-optic cabling that will support Gigabit Ethernet. You're approved to install segments up to 4000 m in length. What kind of cable are you using?
- 1000Base-LX - SMF (Single mode fiber)
What is the difference between short circuits and open circuits?
- A short circuit is an unwanted connection, such as when exposed wires touch each other. - An open circuit is one where needed connections are missing, such as when a wire breaks.
Which fiber transceiver is the same size as SFP transceivers, but can support network speeds over 10 Gbps?
SFP+
What is a twist ratio and why is it important?
- The number of twists per meter or foot. - Affects the reduction or increase of attenuation. -The more twist per meter, the more it is resistant to cross-talk.
Which transmission characteristic is never fully achieved?
Bandwidth
What kind of tool can measure the distance to the location of damage in a cable?
Cable Performance Tester
Which of these categories of twisted-pair cable can support gigabit ethernet? - Cat5, Cat6, Cat7 - Cat5e, Cat6, Cat 3 - Cat5e, Cat6a, Cat7 - Cat6, Cat7a, Cat5
Cat5e, Cat6, Cat7
What is the earliest twisted-pair cabling standard that meets the minimum requirements for 10GBase-T transmissions?
Cat6
What kind of cable uses BNC connectors? Which connector is likely to be used?
Coaxial Cable; F-Connectors
What characteristic of optical transmissions is primarily responsible for distance limitations
Cost and Optical loss
What type of fiber cable problem is caused when pairing a 50-micron core cable with a 62.5-micron core cable?
Fiber type mismatch
What fiber is used in fiber-optic cabling to protect the inner core and prevent the cable from stretching ?
Kevlar (a polymeric fiber)
Which fiber connector contains two strands of fiber in each ferrule?
MTRJ (Mechanical Transfer-Registered Jack)
Which kind of cross-talk occurs between wire pairs near the source of the signal?
NEXT (Near End Cross-Talk)
Suppose you're creating patch cables to be used in a government office. What color wire goes in the first pin?
Orange/White
Which kind of multiplexing assigns slots to nodes according to priority and need?
STDM (Statistical time division multiplexing).
Why is SMF more efficient over long distances than MMF?
Signals traveling over multi-mode fiber experience greater attenuation than those traversing single-mode fiber.
How is latency measured, and in what unit?
The brief delay of electrons between the instant when data leaves the source and when it arrives at its destination. -Measured in milliseconds RTT (Round-trip-time) The time it takes to go from sender to receiver then back to sender.
Why do APC ferrules create less back reflection than UPC ferrules?
The end faces are placed at an angle to each other.
Which part of a toner and probe kit emits an audible tone when it detects electrical activity on a wire pair?
Tone-Locator
