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Network Devices

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Network Devices

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Media on PC

Ethernet

Modem

PC Card (WLAN)

DVB

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Ethernet - Architecture

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Ethernet IEEE 802.3

10Base5 Thick wire coaxial

10Base2 thin wire coaxial / cheaper

net

10BaseT Twisted Pair

10BaseF Fiber Optics

100BaseT Fast Ethernet

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Ethernet 10Base5

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Ethernet 10Base2

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Ethernet 10BaseT

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NIC Connector type

Coaxial Cable

Bayonet Nut Connector (BNC)

Twisted Pair Cable

RJ-45 (8 wire)

Fiber Optics

SMA connectors

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Modem

Allows modems of different vendors to

operate together

Define How modems operate:

Modulation techniques

Data compression technique

Error detection strategy

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Modem Analog vs Digital

Analog Infinite number of levels

Conform to voice pattern Times from highest to lowest and back to the

highest point in one second is the frequency

Can be transmitted over long distance

Digital Only two levels (high and low)

Conforms to how computers operate

Cannot transmitted over long distance

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Modem - Connection

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Modem Internal/External

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PC Card WLAN (802.11) Bypassing last mile

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PC Card (WLAN) - 1

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PC Card (WLAN) - 2

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PC Card (WLAN) Indoor

Antena

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DVB DVB/IP Tech The Digital Video Broadcast over Internet

Protocol (DVB/IP) system is functionally an

IP-over-Ethernet simplex satellite servicethat incorporates frame-relay type traffic

management. At its core, DVB is a modem-

on-a-chip, plus an intelligent multiplexer.

The antenna is typically a CATV dish, 2.4 -3.8 meters in diameter (for C-band), or 0.6 -

1.8 meters (for Ku-band).

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DVB DVB/IP Routing

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DVB - Adaptability

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DVB DVB Card

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M

edia

Wired

Twisted Pair UTP

Coaxial

Fiber

Wireless

Microwave

Satellite

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Twisted Pair Two wired wrapped in

a twisted fashion Designed to reduce

cross-talk dueinductance

Still subject tointerference from straysignal

Primarily used for local

loop connections andLANs

Comparatively narrowbandwidth

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UTP Unshielded Twisted

Pair

Pair 1 White/blue

Blue

Pair 2 White/Orange

Orange

Pair 3 White/Green

Green

Pair 4 White/Brown Brown

RJ45 Connector

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UTP Straight Cable

Wo/O Wg/B Wb/G Wbr/Br

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UTP Cross Cable

Wg/G Wo/B Wb/O Wbr/Br

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UTP - Category

Category Maximum Data Rate Usual Application

CAT 1 Less than 1 Mbps Analog voice (POTS),

Integrated Services Digital Network Basic Rate Interface in ISDN

Doorbell wiring

CAT 2 4Mbps Mainly used in the IBM Cabling System for token ring networks

CAT 3 16Mbps Voice and data on 10BASE-T Ethernet

CAT 4 20Mbps Used in 16Mbps Token Ring

Otherwise not used much

CAT 5 100Mbps 100Mbps TPDDI (100BASE-T or Fast Ethernet)

1000Mbps (4 pair) 155Mbps ATM

Gigabit Ethernet

CAT 5E 100Mbps 100Mbps TPDDI (100BASE-T or Fast Ethernet)

155Mbps ATM

CAT 6 200-250MHz Super-fast Broadband Applications.

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Coaxial

Center lead conducts the signal Protected by insulation and braded wire

Used mostly for television and connections toantenna

Larger Bandwidth but large in size

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Fiber Optical

Signal transmitted by photos rather than electrons

Dramatically higher bandwidth

Used mostly for backbone communicationconnections, very high speed LANs and fastnetwork connections

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Microwave Antenna (1)

Omni

2.4GHz 8dBi

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Sectoral

14dBi 180deg

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Sectoral

17dBi 90deg

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Direct (Grid)

2.4 GHz 24dB

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Microwave Power AMP

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Satellite - Broadband

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Media Comparison

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Multiplexer

HUB

Switch

Bridge

Router

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Hub versus Switch

Hub provide connection to all ports (i.e. in

one port and out all other ports).

Passive hub no signal regeneration Active hub provide signal regeneration

Switch direct the message from appropriate

port (directs a message from the input port

to the desired output port). More expensive but better bandwidth utilization

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Hub versus Switch

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LAN Hub device

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Hub

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LAN Switch device

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Switch

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Bridge Access Point (WLAN)

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Router

Connecting different segment

Have different interfaces (Ethernet,

WAN-Serial, Fiber, etc)

Table Routing

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Router

Documents

Net Device