wireless community ajmal nazir green dot ltd. agenda introduction wireless network coverage spectrum...
TRANSCRIPT
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