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C172 - Networking & Security > Lesson 3: Physical Layer Cabling: Fiber Optics > Flashcards

Lesson 3: Physical Layer Cabling: Fiber Optics Flashcards

1
Q

Absorption

A

Light interaction with the atomic structure of the fiber material; also involves the conversion of optical power to heat

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2
Q

Backbone

A

Main fiber distribution. The primary path for data traffic to and from destinations and sources in the campus network

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3
Q

Cladding

A

Material surrounding the core, which must have a lower index of refraction to keep the light in the core

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4
Q

Dense Wavelength Division Multiplex (DWDM)

A

Incorporates the propagation of several wavelengths in the 1550 nm range for a single fiber

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5
Q

Dispersion

A

Broadening of a light pulse as it propagates through a fiber strand

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6
Q

Dispersion Compensating Fiber

A

Acts like an equalizer, canceling dispersion effects and yielding close to zero dispersion in the 1550 nm region

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7
Q

Distributed Feedback (DFB) Laser

A

A more stable laser suitable for use in DWDM systems

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8
Q

DL

A

Diode laser

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9
Q

Fiber Bragg Grating

A

A short strand of modified fiber that changes the index of refraction and minimizes intersymbol interference

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10
Q

Fiber Cross-connect

A

Optical patch panel used to interconnect fiber cables

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11
Q

Fiber, Light Pipe, Glass

A

Terms used to describe a fiber-optic strand

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12
Q

FTTB

A

Fiber to the Business

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13
Q

FTTC

A

Fiber to the Curb

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14
Q

FTTD

A

Fiber to the Desktop

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15
Q

FTTH

A

Fiber to the Home

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16
Q

Fusion Splicing

A

A long-term method where two fibers are fused or welded together

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17
Q

GBIC

A

Gigabit interface converter

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18
Q

Graded-index Fiber

A

The index of refraction is gradually varied with a parabolic profile

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19
Q

IC

A

Interconnect fibers branch exchange—item D shows the jumpers connecting the main fiber cross-connect (item B) to the active equipment (item C)

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20
Q

IDC

A

Intermediate distribution closet

21
Q

Index-matching Gel

A

A jellylike substance that has an index of refraction much closer to glass than to air

22
Q

Infrared Light

A

Light extending from 680 nm up to the wavelengths of the microwaves

23
Q

Isolator

A

An inline passive device that allows optical power to flow only in one direction

24
Q

LED

A

Light-emitting diode

25
Q

Logical Fiber Map

A

Shows how the fiber is interconnected and data is distributed throughout a campus

26
Q

Long-Haul

A

The transmission of data over hundreds or thousands of miles

27
Q

Macrobending

A

Loss due to light breaking up and escaping into the cladding

28
Q

Mechanical Splices

A

Two fibers joined together with an air gap, thereby requiring an index-matching gel to provide a good splice

29
Q

Microbending

A

Loss caused by very small mechanical deflections and stress on the fiber

30
Q

mm

A

Multimode

31
Q

Mode Field Diameter

A

The actual guided optical power distribution, which is typically a micron or so larger than the core diameter; single-mode fiber specifications typically list the mode field diameter

32
Q

Multimode Fiber

A

A fiber that supports many optical waveguide modes

33
Q

Numerical Aperture

A

A measure of a fiber’s ability to accept light

34
Q

Optical Ethernet

A

Ethernet data running over a fiber link

35
Q

Optical Spectrum

A

Light frequencies from the infrared on up

36
Q

Physical Fiber Map

A

Shows the routing of the fiber but also shows detail about the terrain, underground conduit, and entries into buildings

37
Q

Pulse Dispersion

A

Stretching of received pulse width because of multiple paths taken by the light

38
Q

Received Signal Level (RSL)

A

The input signal level to an optical receiver

39
Q

Refractive Index

A

Ratio of the speed of light in free space to its speed in a given material

40
Q

Scattering

A

Caused by refractive index fluctuations; accounts for 96 percent of attenuation loss

41
Q

SFP

A

Small Form Pluggable

42
Q

Single-mode Fiber

A

Fiber cables with core diameters of about 7-10 µm; light follows a single path

43
Q

sm

A

Single mode

44
Q

SONET/SDH

A

Synchronous optical network; protocol standard for optical transmission in long-haul communication/synchronous digital hierarchy

45
Q

STS

A

Synchronous transport signals

46
Q

Tunable Laser

A

Laser in which the fundamental wavelength can be shifted a few nanometers, ideal for traffic routing in DWDM systems

47
Q

Vertical Cavity Surface Emitting Lasers (VCSELs)

A

Lasers with the simplicity of LEDs and the performance of lasers

48
Q

XENPAK, XPAK, X2, XFP, SFP+

A

The ten gigabit interface adapter

49
Q

Zero-dispersion Wavelength

A

Point where the dispersion is actually zero

C172 - Networking & Security (8 decks)

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