Wireless Network Selo TE UGM

Wireless Networking Wireless Networking (Wi-Fi) Wireless Networking (Wi-Fi) Introduction and Benefits Introduction and Benefits Wireless Devices Wireless Devices Considerations Considerations Standards Standards Advice Advice Bluetooth Bluetooth Ethernet over Mains Ethernet over Mains Demonstrations Demonstrations

Introduction Use of Radio Frequency to connect devices in a LAN or WAN topology. Use of Radio Frequency to connect devices in a LAN or WAN topology. Ethernet type speeds. Ethernet type speeds. Low cost solutions. Low cost solutions. Multiple standards and speeds Multiple standards and speeds

Benefits Increased Mobility Increased Mobility Simple and Flexible Installation Simple and Flexible Installation Easy Scalability Easy Scalability No need for wiring No need for wiring Ideal for listed buildings or private homes Ideal for listed buildings or private homes

How does is work? Access Points — stationary transceivers Access Points — stationary transceivers APs act as broadcast-and-receive base stations for wireless network traffic APs act as broadcast-and-receive base stations for wireless network traffic APs can offer some encryption, security and other services, including access APs can offer some encryption, security and other services, including access Radio frequency signal coverage typically ranges from 100 to 300 feet Radio frequency signal coverage typically ranges from 100 to 300 feet

How does is work? APs are connected to a wired Ethernet network (bjack, switch, hub, or router) or to a cable modem or DSL connection APs are connected to a wired Ethernet network (bjack, switch, hub, or router) or to a cable modem or DSL connection Once you have an Access Point in operation, wireless networking is enabled in its vicinity Once you have an Access Point in operation, wireless networking is enabled in its vicinity

How does is work? A wireless device or adapter is needed to access the wireless LAN with a notebook computer, PDA, Tablet PC, wireless printer, wireless Webcam, or other Wi-Fi- compliant peripheral A wireless device or adapter is needed to access the wireless LAN with a notebook computer, PDA, Tablet PC, wireless printer, wireless Webcam, or other Wi-Fi- compliant peripheral Types of Wi-Fi devices: PC (PCMCIA) cards, Compact Flash and Secure Digital (SD) IO cards, PCI NICs, USB Wi-Fi adapters, or built-in (e.g. Intel Centrino) Types of Wi-Fi devices: PC (PCMCIA) cards, Compact Flash and Secure Digital (SD) IO cards, PCI NICs, USB Wi-Fi adapters, or built-in (e.g. Intel Centrino)

Wireless Devices Wireless APs (Access Points) Wireless APs (Access Points) Connect wireless clients to the wired network via a standard ethernet port. Connect wireless clients to the wired network via a standard ethernet port. Supply limited Access Control Supply limited Access Control Seamless roaming (Vendor specific) Seamless roaming (Vendor specific) Act as ethernet Bridges Act as ethernet Bridges

Wireless Devices… Station Adapters Station Adapters Connect machine to AP Connect machine to AP Or Can support ad-hoc mode Or Can support ad-hoc mode Can be PCI, PCMCIA or USB Can be PCI, PCMCIA or USB Support different levels of encryption Support different levels of encryption Can connect external aerial Can connect external aerial

Wireless Devices… Soho Wireless Routers Soho Wireless Routers A wireless AP, combined with a network hub or switch, firewall, NAT and broadband router A wireless AP, combined with a network hub or switch, firewall, NAT and broadband router Excellent value Excellent value Space saving Space saving

Wireless Devices… Appliances Wireless Camera Wireless Camera Wireless enabled PDA Wireless enabled PDA Wireless enabled Mobile phone Wireless enabled Mobile phone Wireless Sony Dog Wireless Sony Dog

Considerations Range: Range: One of the most important factors. One of the most important factors. AP and Station have a much greater range AP and Station have a much greater range outdoors. outdoors. Limited to ft indoors. Limited to ft indoors. Affected by interference from microwavesand other RF devices. Affected by interference from microwavesand other RF devices. Interference from physical structures. Interference from physical structures.

Considerations… Throughput: Not as good as a wired LAN Not as good as a wired LAN Speeds between 11Mb and 54Mb Speeds between 11Mb and 54Mb Wireless is shared Ethernet Wireless is shared Ethernet Encryption increases overhead Encryption increases overhead

Considerations… Integrity: Generally stable form of communication Generally stable form of communication Problems encountered with roaming Problems encountered with roaming Atmospheric problems Atmospheric problems Not as reliable as conventional Ethernet Not as reliable as conventional Ethernet

Considerations… Interoperability: Wi-Fi Standard should make this easier. Wi-Fi Standard should make this easier. IEEE standard IEEE standard Works like a wired network due to the devices transparent protocol. Works like a wired network due to the devices transparent protocol. Encryption Problems Encryption Problems

Considerations… Scalability: Can be extremely simple or quite complex Can be extremely simple or quite complex Limited APs in range of each other Limited APs in range of each other Bleeding between channels Bleeding between channels Roaming can extend networks Roaming can extend networks

Considerations… Simple installation: Need very little information Need very little information Plug and play style Plug and play style Diagnostic tools provided Diagnostic tools provided However there are some golden rules… However there are some golden rules…

Considerations… Security: WEP Encryption not enough (Silver or Gold) WEP Encryption not enough (Silver or Gold) VPN technology such as PPTP has been cracked. VPN technology such as PPTP has been cracked. MAC Addresses can be spoofed MAC Addresses can be spoofed ESSIDs can be found ESSIDs can be found

Considerations… Safety: Output power of wireless systems is very low and much less than a mobile phone. Output power of wireless systems is very low and much less than a mobile phone. Very little exposure to RF due to the nature of the rapidly fading radio waves. Very little exposure to RF due to the nature of the rapidly fading radio waves. Wireless equipment must meet government and industry regulations for safety. Wireless equipment must meet government and industry regulations for safety.

Standards legacy Original Wi-Fi standard released in 1997 Original Wi-Fi standard released in or 2Mb/sec 1 or 2Mb/sec IR or RF 2.4Ghz IR or RF 2.4Ghz Dropped in favour of b Dropped in favour of b

Standards… b Range of about 50metres Range of about 50metres Up to 8km (120km Line of Sight) Up to 8km (120km Line of Sight) Maximum throughput of 11 Mb/sec Maximum throughput of 11 Mb/sec On average 5.5Mb/sec On average 5.5Mb/sec Runs in the 2.4Ghz spectrum Runs in the 2.4Ghz spectrum Shared medium Shared medium

Standards… a Released in 2002 Released in 2002 Maximum throughout of 54Mb/sec Maximum throughout of 54Mb/sec Range limited Range limited Runs in the 5Ghz spectrum Runs in the 5Ghz spectrum Not widely adopted Not widely adopted

Standards… g g Released in June 2003 Released in June 2003 Maximum throughput of 54 or 22 Mb/sec Maximum throughput of 54 or 22 Mb/sec Fully backwards compatible Fully backwards compatible Operates in the 2.4Ghz spectrum Operates in the 2.4Ghz spectrum Most widespread now Most widespread now

Standards… n In January 2004 announced new standard for Wireless networking In January 2004 announced new standard for Wireless networking 100Mb/sec 100Mb/sec Better operating distances Better operating distances Standardization in 2005 Standardization in 2005

Advice b is very cheap now b is very cheap now g useful for greater bandwidth g useful for greater bandwidth Use WEP Use WEP Use MAC address limiting Use MAC address limiting Check logs Check logs Paranoid people can use IPSec Paranoid people can use IPSec Use the same vendors equipment Use the same vendors equipment

Advice… Ask for advice from members of DARC Ask for advice from members of DARC Try and test Wi-Fi access in your location Try and test Wi-Fi access in your location Purchase a Soho Wi-Fi router if you have broadband Purchase a Soho Wi-Fi router if you have broadband Don’t buy a USB adaptor Don’t buy a USB adaptor Use PCMCIA or built in Wi-Fi Use PCMCIA or built in Wi-Fi

Bluetooth Designed to allow low bandwidth wireless communications between devices. Designed to allow low bandwidth wireless communications between devices. Primarily used in the mobile phone industry but also designed for home appliances. Primarily used in the mobile phone industry but also designed for home appliances. Range of about 10M at 1Mb/sec. Range of about 10M at 1Mb/sec. Operates in the 2.4Ghz spectrum. Operates in the 2.4Ghz spectrum. USB dongles or built into laptops USB dongles or built into laptops

Instalation

Instalation

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