Wireless Community

Ajmal Nazir

Green Dot Ltd

Green Dot Ltd

AGENDA

Introduction Wireless Network Coverage Spectrum Planning NMS (Network Management System)

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“A Year is an eternity in Networking” Wireless Define our community

Geographically based Interest based

Define our Scope Cost Coverage services

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Wireless Networking

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Wireless Network

Point to Multipoint

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PTMP

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PTMP and PTP

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Connecting to the Internet

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Connecting to the Internet

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Redundancy/Load Balancing Mesh protocol Capacity Redundancy scalability

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Simple Mesh Network

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Access Point

Radio for ACCESS network (2.4G) for the users

Radio for BH network (5G) for the AP’s (PTP or PTMP)

In built switch Outdoor enclosures

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Coverage

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Wireless Coverage

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Coverage

FREE SPACE Budget = 90db Window (3db) Wall (6-10db) 1/2/3 walls Roof(metal/wood) (3-10db) Multipath (4db)

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Distance ChartBudget (db) Distance (m)

90 300

84 150

78 75

72 37.5

66 19

60 9.5

54 5

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Coverage Analysis

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RF Mapping Tools

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Spectrum Planning

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802 Standards

802.11/a/b/g/n 802.16/a/d/e/m 802.20 802.1x

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2.4 Spectrum 802.11b/g

Channels 1 to 11 Each channel is 22 MHz in size Channel spacing is 5 MHz

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2.4 Spectrum

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Channel Planning

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Interference

CSMA/CA (Carrier Sense Multiple Access Collision Avoidance)

Reduce through put Change channel/power Directional antennas/shielding

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NMS

(Network Management System)

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Security

802.1x 802.11i WEP (RC4 stream cipher) WPA (RC4) AES/DES WPA2/RSN (AES block cipher) Authentication Server

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NMS (Network Management System) Security NAT/DHCP Routing/firewalls Traffic engineering

http P2p Mail RTP

Measure usage Speed (512kbps/1Mb/2Mb…11Mb) Traffic usage (1/5/10G)

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Operations

Monitoring of nodes Capacity planning Usage patterns Redundancy SLA’s

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Multi Antenna System Upto extra 10db Extended range Robust and

reliable

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Multipath

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Other Tools

Space Division Multiple Access (SDMA)

Directional Antennas Receivers Channel Bonding

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Other Factors

SSID’s – Virtual mesh networks Roaming FREE wall gardens Public Safety

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Questions and Answers ?

Ajmal Nazir