2001/11/23 Prof. Huei-Wen Ferng 1 Chapter 4 Wireless LAN Technologies and Products.

2001/11/232001/11/23 Prof. Huei-Wen FerngProf. Huei-Wen Ferng 11

Chapter 4Chapter 4

Wireless LAN Technologies and Wireless LAN Technologies and ProductsProducts


Wireless LAN ProductsWireless LAN Products


Choosing a WLANChoosing a WLAN

What are the applications? Is mobility required?What are the applications? Is mobility required? What level of performance is acceptable?What level of performance is acceptable? Will infrared satisfy the needs?Will infrared satisfy the needs? To what backbone networks do we need to To what backbone networks do we need to

connect?connect? With what network OS do we need to work?With what network OS do we need to work? Is it secure?Is it secure? How easy is it to install? To use? To manage?How easy is it to install? To use? To manage? How much does it cost? ($500)How much does it cost? ($500)


Current ApplicationsCurrent Applications

Wire replacement applicationsWire replacement applications Mobile computing applicationsMobile computing applications


Lucent WaveLANLucent WaveLAN


Product LineProduct Line


Network TopologyNetwork Topology


Components of APComponents of AP

A wireless LAN adaptor to communicate A wireless LAN adaptor to communicate with the wireless nodeswith the wireless nodes

A wired adaptor to communicate over the A wired adaptor to communicate over the backbonebackbone

MAC layer bridging software to filter traffic MAC layer bridging software to filter traffic from the backbone to the wireless subnetfrom the backbone to the wireless subnet


System Engineering Spec.System Engineering Spec.

The radioThe radio 902-928 MHz ISM 902-928 MHz ISM

bandband 2.4-2.483 GHz ISM 2.4-2.483 GHz ISM

bandband 250 mw power output 250 mw power output

in 900 MHz band, 100 in 900 MHz band, 100 mw in the 2.4 GHz mw in the 2.4 GHz bandband

MACMAC CSMA/CACSMA/CA

ModulationModulation DSSSDSSS DQPSKDQPSK

Protocols supportedProtocols supported Novell NetWare 2.x Novell NetWare 2.x

and 3.xand 3.x TCP/IPTCP/IP LAN mangerLAN manger Windows for Windows for

workgroupsworkgroups Banyan VINESBanyan VINES


AP’s FunctionsAP’s Functions

MAC layer transparent bridge (IEEE 802.1D)MAC layer transparent bridge (IEEE 802.1D) Filtering/forwardingFiltering/forwarding Automatic learning and agingAutomatic learning and aging Spanning tree algorithmSpanning tree algorithm SNMP managementSNMP management Radio path diagnosticsRadio path diagnostics Access controlAccess control Net IDNet ID


Supported PHY Types of EthernetSupported PHY Types of Ethernet

10BaseT10BaseTTwisted pair EthernetTwisted pair Ethernet

10Base210Base2Thin wire EthernetThin wire Ethernet

10Base510Base5Thick wire EthernetThick wire Ethernet


DEC DEC


Protocols SupportedProtocols Supported

Pathworks V4.1Pathworks V4.1Novell NetWare 2.x and 3.xNovell NetWare 2.x and 3.xTCP/IPTCP/IPLAN managerLAN managerWindows for workgroupsWindows for workgroupsBanyan VINESBanyan VINES


Products in the WorldProducts in the World


ProductsProducts

DECtransporter for the MS-DOS/MS-WindowsDECtransporter for the MS-DOS/MS-Windows A TCP/IP packageA TCP/IP package Enables cellular connection with appropriate modem, Enables cellular connection with appropriate modem,

or a wired connection with appropriate modemor a wired connection with appropriate modem

DECtransporter for OpenVMS VAXDECtransporter for OpenVMS VAX A TCP/IP to packet radio network gatewayA TCP/IP to packet radio network gateway Enables connection to a private network over a public Enables connection to a private network over a public

packet radio network such as Mobitex or ARDISpacket radio network such as Mobitex or ARDIS


Remote Connectivity ConfigurationRemote Connectivity Configuration


Solectek AIRLANSolectek AIRLAN


Protocols SupportedProtocols Supported


Proxim RangeLAN 2Proxim RangeLAN 2


System TechnologySystem Technology

FHSSFHSS2.4-2.483 GHz ISM band2.4-2.483 GHz ISM band15 independent channels15 independent channelsCSMA/CACSMA/CA100 mw transmitted power100 mw transmitted powerGaAs semiconductorGaAs semiconductorPower from computer’s internal batteryPower from computer’s internal battery


AP’s CapabilitiesAP’s Capabilities

MAC layer bridgeMAC layer bridge Spanning tree protocolSpanning tree protocol Roaming from one bridge to anotherRoaming from one bridge to another Transparent to all EthernetsTransparent to all Ethernets SNMP agent providedSNMP agent provided Diverse protocols supportedDiverse protocols supported

Novell NetWare 2.x, 3.x, 4.x, LiteNovell NetWare 2.x, 3.x, 4.x, Lite LAN managerLAN manager Windows for WorkgroupsWindows for Workgroups


ISA EquipmentISA Equipment

Interface cardInterface cardAntennaAntennaSoftwareSoftwareManualManual


InstallationInstallation

HardwareHardware Confirm default setting Confirm default setting

on cardon card Install card in Install card in

computercomputer Screw antenna onto Screw antenna onto

connector in back of connector in back of cardcard

SoftwareSoftware Copy configured Copy configured

IPX.COM driver to IPX.COM driver to hard diskhard disk

Load the IPX driver Load the IPX driver and DOS shell, NETXand DOS shell, NETX

Copy the LOGIN.EXE Copy the LOGIN.EXE filefile


Xircom NetwaveXircom Netwave


TechnologyTechnology

FHSSFHSS50 mw power output50 mw power output2.4-2.483 GHz ISM band2.4-2.483 GHz ISM bandHop every 0.1sHop every 0.1sSynchronized systemSynchronized system


Two Kinds of Ad Hoc NetsTwo Kinds of Ad Hoc Nets

Public hoc networksPublic hoc networksAnyone in range can join a public ad hoc Anyone in range can join a public ad hoc

networknetworkNamed ad hoc networksNamed ad hoc networks

One station must start a named networkOne station must start a named networkOther stations join if they specify the nameOther stations join if they specify the name

Optional encryption is availableOptional encryption is available


IBM Wireless LANIBM Wireless LAN



FHSS in the 2.4 GHz bandFHSS in the 2.4 GHz band100 mw power output100 mw power outputAntenna receive polarization diversityAntenna receive polarization diversityTDMA MAC layer (FCFS)TDMA MAC layer (FCFS)Ethernet and Token Ring compatibilityEthernet and Token Ring compatibilitySNMP agentSNMP agent


Administration FunctionAdministration Function

Authentication and privacyAuthentication and privacyUsers are registered with WNA (wireless Users are registered with WNA (wireless

network administrator) and provided secret network administrator) and provided secret keyskeys

Registered stations are authenticated by APRegistered stations are authenticated by APOptional encryption is availableOptional encryption is available

Interference management through change Interference management through change of hopping patternof hopping pattern


Motorola AltairMotorola Altair



Not SSNot SS In the 18 GHz bandIn the 18 GHz bandLow power- 25 mwLow power- 25 mwComprised of a control module (CM) and a Comprised of a control module (CM) and a

user module (UM)user module (UM)8x11.5x3 inches in size8x11.5x3 inches in sizeAntenna internal to moduleAntenna internal to modulePackaging similar for both modulesPackaging similar for both modules


WindataWindata


The Hub FunctionsThe Hub Functions

Connectivity of transceiversConnectivity of transceiversSynchronizationSynchronizationAccess securityAccess securityPower controlPower controlNetwork managementNetwork management


SNMP FunctionsSNMP Functions

Enabling and disabling transceiversEnabling and disabling transceiversAdding and deleting access to stationsAdding and deleting access to stationsMonitoring performanceMonitoring performanceChecking status of radio linkChecking status of radio link


RadioLANRadioLAN



ISA cardISA cardParallel port versionParallel port versionRadioLAN/10 Access UnitRadioLAN/10 Access UnitRadio transceiverRadio transceiverBase stationBase station


OS and Driver SupportOS and Driver Support


PhotonicsPhotonics


Product Line (for PC)Product Line (for PC)

PCMCIA II cardPCMCIA II card ISA cardISA cardCollaborative parallel optionCollaborative parallel optionAPAPExternal transceiverExternal transceiver


IR TransceiverIR Transceiver


Diffuse IRDiffuse IR


SpectrixSpectrix


Network Block DiagramNetwork Block Diagram


InfraLANInfraLAN


Directed IR TransceiverDirected IR Transceiver


Network Topology (Token Ring)Network Topology (Token Ring)


Network Topology (Ethernet PTP)Network Topology (Ethernet PTP)


Network Topology (Ethernet Hub)Network Topology (Ethernet Hub)


Comparisons (Mobile)Comparisons (Mobile)


Comparisons (Wire Replacement)Comparisons (Wire Replacement)


ReferencesReferences

Rifaat A. Dayem, Mobile Data & Wireless Rifaat A. Dayem, Mobile Data & Wireless LAN Technologies, Chapter 7.LAN Technologies, Chapter 7.

2001/11/23 Prof. Huei-Wen Ferng 1 Chapter 4 Wireless LAN Technologies and Products.

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Transcript of 2001/11/23 Prof. Huei-Wen Ferng 1 Chapter 4 Wireless LAN Technologies and Products.