Wireless Community Ajmal Nazir Green Dot Ltd. AGENDA Introduction Wireless Network Coverage Spectrum...
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Transcript of Wireless Community Ajmal Nazir Green Dot Ltd. AGENDA Introduction Wireless Network Coverage Spectrum...
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
Green Dot Ltd
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
Green Dot Ltd
Coverage
FREE SPACE Budget = 90db Window (3db) Wall (6-10db) 1/2/3 walls Roof(metal/wood) (3-10db) Multipath (4db)
Green Dot Ltd
2.4 Spectrum 802.11b/g
Channels 1 to 11 Each channel is 22 MHz in size Channel spacing is 5 MHz
Green Dot Ltd
Interference
CSMA/CA (Carrier Sense Multiple Access Collision Avoidance)
Reduce through put Change channel/power Directional antennas/shielding
Green Dot Ltd
Security
802.1x 802.11i WEP (RC4 stream cipher) WPA (RC4) AES/DES WPA2/RSN (AES block cipher) Authentication Server
Green Dot Ltd
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)
Green Dot Ltd
Other Tools
Space Division Multiple Access (SDMA)
Directional Antennas Receivers Channel Bonding