Media & Cabling Distribution Flashcards

1
Q

Coaxial Cable

A

Inner: Insulated conductor or center wire passes data

Outer: Braided metal shield used to help protect the data transmission (EMI resistance)

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2
Q

Coaxial Cable Types

A

RG-6: Used by local cable companies to connect individual homes

RG-59: Used to carry composite video between two nearby devices

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3
Q

Coaxial Cable Connectors

A

BNC (Bayonet Neill-Concelman - British Naval Connector):
Was used for 10BASE2 Ethernet Networks

F-Connector:
Typically used for cable TV & cable modem connections

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4
Q

Twisted Pair Cables

A

Most popular LAN media type
8 individually insulated strands of copper wire
Each pair twisted to reduce EMI
(Tighter twists = less EMI)

UTP & STP

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5
Q

UTP

A

Unshielded Twisted Pair
Media of choice in most LANs
Number of twists determines EMI amount blocked
(CAT6 has more twists per inch than CAT5)

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6
Q

STP

A

Shielded Twisted Pair
Wires are surrounded by a metallic shielding to minimize EMI

Shielding makes STP more costly and less flexible than UTP

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7
Q

Twisted Pair Connectors

A

RJ-45: 8-pin connector in Ethernet networks
Most Ethernet use only 4-pins

RJ-11: 6-pin connector (telephone systems)
Commonly only 2/4 pins are used

DB-9 or DB-25 (9 or 25-pin D-Subminiature)
Used for asynchronous serial communications & connecting to an external modem

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8
Q

Twisted Pair Cable Throughput

A

CAT3: 10Mbps - 100m
CAT5: 100Mbps - 100m
CAT5e: 1Gbps - 100m
CAT6: 1Gbps - 100m
CAT6a: 10Gbps - 100m
CAT7: 10Gbps - 100m

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9
Q

Straight-Through Patch Cables

A

Both ends of the cable have matching pin outs
T-568B is the preferred standard for wiring a building

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10
Q

DTE to DCE

A

Data Terminating Equipment to Data Communications Equipment

Examples: Computer to switch
Router to modem

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11
Q

Crossover Cables

A

Send & receive pins of the cable are swapped in the end pin outs.

Used to connect two workstations
Or a switch to a switch
(Not required if switch supports MDIX)

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12
Q

T568B vs. T568A

A

T568B:
OW, O, GW, B, BW, G, BrW, Br

T568A:
GW, G, OW, B, BW, O, BrW, Br

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13
Q

Fiber Optic Cables

A

Use light from LED or laser to transmit info through glass fiber.
Immune to EMI, uses light instead of electricity

Great range, greater data-carrying capacity (Tbps)

Types: MMF & SMF

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14
Q

MMF

A

Multimode Fiber
Shorter distances than single-mode
Larger core sizes allows for multiple modes of travel for the light signal (62.5 microns)

Uses: Routers to switches
Switches to switches
Servers to switches

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15
Q

SMF

A

Single-Mode Fiber
Longer distances than multimode
Smaller core allows for only a single mode of travel for the light signal (10 microns)

Uses: Routers to switches
Switches to switches

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16
Q

Fiber Optic Connectors

A

SC (Subscriber Connector) - “Stick & Click”
ST (Straight Tip Connector) - “Stick & Twist”
LC (Lucent Connector) - Looks like two SCs
MTRJ (Mechanical Transfer Registered Jack)

Refer to diagrams on Dion study guide

17
Q

Copper vs. Fiber Optic Cables

A

Fiber Optic: (40Km+, 69Tbps+)
Higher bandwidth
longer distances
Immune to EMI
Better security

Copper: (<100m, 10Gbps)
Less expensive
Easy to install
Inexpensive tools

18
Q

Media Converters

A

Convert media from one format to another
Layer 1 Device (physical conversion of signal only)

Ethernet to Fiber Optic
Fiber Optic to Ethernet
Coaxial to Fiber
Fiber to Coaxial

19
Q

Cable Distribution System Components

A

Entrance Facilities
Main Distribution Frame (MDF)
Cross-connect Facilities
Intermediate Distribution Frame (IDF)
Backbone Wiring
Telecommunications Closet
Horizontal Wiring
Patch Panels
Work Area

20
Q

Punch Down Blocks

A

66 Block:
Used for phones & older LAN wiring
Causes crosstalk due to proximity of cables
Do not use for CAT5 and above

110 Block:
Used for higher-speed network wiring
Required for CAT5 and above

Krone Block:
A proprietary European alternative to a 110 block

BIX Block:
Another proprietary punch down block (various sizes)
Requires a BIX specific punch down tool

21
Q

Patch Panels (Copper)

A

Device with jacks to connect wiring from the jack to a network switch in a flexible manner

Back has punch downs like a 110 block to connect wiring to wall jacks in building

Front has RJ-45 jacks

22
Q

Patch Panels (Fiber)

A

Connect fiber jacks throughout building to a single patch panel in network closet

Front uses patch cables to connect to different wall jacks & switch ports

23
Q

Fiber Optic Connector Types

A

SC (Stick & Click)
ST (Stick & Twist)
LC (Love Connector - Like two SCs attached)
MTRJ (Looks like an RJ-45 kind of; one plastic piece with two connectors)

24
Q

Specialized Fiber Optic Connectors

A

APC (Always Green) - Usually for SC

UPC (Always Blue) - Usually for MTRJ

25
Q

WDM

A

Wavelength Division Multiplexing:
Combines multiple signals into one signal & sends over a single fiber optic strand using different wavelengths of the laser light source

26
Q

Coarse WDM (CWDM)

A

Up to 18 channels

20nm

Up to 10Gpbs (Ethernet)
Up to 16Gbps (Fiber)

27
Q

Dense WDM (DWDM)

A

Up to 80 channels

0.8nm

Up to 8 Tbps
(100Gbps/channel)

28
Q

GBIC

A

Standard, hot-pluggable gigabit ethernet transceiver (copper/fiber)

29
Q

SFP

A

Small Form-Factor Pluggable (Mini GBIC)
Compact, hot-pluggable optical module transceiver
Up to 4.25Gbps

30
Q

SFP+

A

Enhanced SFP
Up to 16Gbps

31
Q

QSFP

A

Quad Small Form-Factor Pluggable
Compact, hot-pluggable optical module transceiver
Up to 40Gbps

QSFP+ = 41.2Gbps
QSFP28 = 100Gbps
QSFP56 = 200Gbps