Wireless Community Ajmal Nazir Green Dot Ltd. AGENDA Introduction Wireless Network Coverage Spectrum Planning NMS (Network Management System)

Wireless Community

Ajmal Nazir

Green Dot Ltd

Green Dot Ltd

AGENDA

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

Green Dot Ltd

“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