Download - Wireless Community
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