Net Device
Transcript of Net Device
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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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Microwave Antenna (2)
Sectoral
14dBi 180deg
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Microwave Antenna (3)
Sectoral
17dBi 90deg
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Microwave Antenna (4)
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