Wireless Lan
Transcription
Wireless Lan
Produktinformationen Wireless Lan Haben Sie Fragen oder wünschen eine Beratung, eine kostenlose Teststellung oder weitere Informationen? [email protected] Tel.: 02203 – 96960 Mobil: 0174 - 9222144 XNC GmbH Auf der Kaiserbitz 3 D-51147 Köln Amtsgericht Köln HRB 25563 Geschäftsführer Frank Bergknecht Installationen mit Meru’s WLAN System Meru Überblick ◆ Meru zielt auf zwei der derzeit am stärksten IT Wachstumsmärkte —VoIP and Wireless ◆ Innovative Technologie ● ● ● ◆ Eliminiert die derzeit komplexe RF Planung High performance, High density (Leistung und Dichte) Liefert High-Quality wireless VoIP Industrielle Auszeichungen Die Industrie sieht derzeit Meru als Branchenführer! WLAN Architektur Evolution “Stand Alone” or “Fat” AP LAN Switch Aruba, Trapeze, Extreme, Airespace “Thin” AP WLAN Switch “Intelligent & Coordinated” Edge WLAN Switch / Controller Architecture Stand Alone APs, Centralized or Distributed Management Centralized Intelligence Overlay WLAN Network, Distributed Intelligence, Centralized Control Benefits Simple Implementation for a Few Access Points, Centralized Management Scaleable, Central Management RF Coordination, Over-theAir QoS, Simple Deployment, Scaleable, Management Target Markets SOHO, Medium & Large Enterprise Medium & Large Enterprise Large Scale Enterprise 2005 – Unstrung Insider: Enterprise VOIP Mobility Leadership As of August, 2005 5 Top Equipment Makers Pick Meru for Wireless VoIP Solution VoIP Server Handsets Wireless LAN + + + Wireless / VoIP Security Wi-Fi Handset Cellular/Wi-Fi Dual-mode Handset Meru’s Unique Solution Advantages Compared to Extreme’s WLAN Better WLAN Performance • • • Predictable, fair service to all clients Higher performance in dense user environments Higher performance in mixed-mode 802.11b & 802.11g clients Easy Deployment • • Co-channel Interference Management Reduced RF planning Better Mobility/Roaming • Zero Handoff vs. Slow Handoff Better QoS / VoWLAN Support • • • Over-the-air upstream and downstream QoS Automatic voice flow detection (SIP, H323, SVP, SCCP) Advanced Call-Admission Control, call load-balancing and dynamic error correction capabilities Meru Differentiation: Air Traffic Control (ATC) Functionality Centralized Control Benefits Global Policies Global Coordination Central RF Intelligence App Flow Inspection Contention Management AP Intelligence - QoS Flow Recognition - Application Detection - Local RF Coordination - Admission Control Co-Channel Management - ATC MAC - Local Governance - Scheduling - Virtual MAC for Clients - 802.11 Control Voice Client Performed in Controller Performed in the Access Point Jitter and Bandwidth Management Zero Handoff Air Traffic Control Technology More Bandwidth For More Users Active Users Per AP 100+ 11 8 (Mbps) Total Bandwidth at Peak Peak Aggregate Throughput Meru AP Performance 5 1 Contention Loss 20-25 Today’s AP (others) Performance 3 20-25 Number of Active Users Others Meru Air Traffic Control Technology : More Voice Calls over-the-air QoS AP Wired QoS Standards-based Over-the-Air QoS AP Wired QoS ~High Voice Quality ~Low AP+ Switch standard Client Data and voice typically on Separate channels/network MOS Score 4.0+ Meru AP & Standard Client Converged Network - voice and data on same channels Air Traffic Control Technology Service Fairness Throughput Standard AP’s + 20 Clients ◆ ◆ Throughput 1 Meru AP + 20 Clients Industry leading aggregate throughput at density Predictable, uniformly fair throughput across all clients ● Other AP’s erratic, unfair access over short term intervals Air Traffic Control Technology Zero Loss Handoff Other WLAN Meru WLAN Virtual Cell Architecture BSSID = A BSSID = B 01:00 100ms – 2 sec between handoff BSSID = M BSSID = M 00:00 No Handoff For Client How Over-the-Air QoS Compares Global RF Knowledge and Inter-cell Coordination Application Flow Detection and Classification Admission Control Downlink (AP to Client) Uplink (Client to AP) “Others” Meru Air Traffic Control -- Yes Static ESSID-based or Filters Yes (Dynamic) -- Yes Simple Priority of packets Reservation-based True over-the air QoS -- Reservation-based True over-the air QoS Voice Services Module Further Improves Users Experience ◆ Consists ● ● ● of the following components: Call Admission Control Call Load Balancing Dynamic Error Correction Call Admission Control ◆ Enables administrator to configure system to allow a given number of active calls ◆ Upon reaching limit, call can either be rejected with Network Busy (similar to PSTN) or can be moved to alternate channel that has available resources Call Load Balancing ◆ ◆ ◆ System can perform balancing of the data/voice devices across multi-channel deployments in dense networks. Dynamically re-balance phones during call setup to achieve peak call density in an area (3X other vendors). Allows you to paint an area with 3 channels to achieve 3X call density allowing you to handle common deployment situations where workers congregate in a break area or conference room and all place calls simultaneously. Example Load Balancing Within a VirtualCell ◆ ◆ ◆ After initial assignment, AP1: 6 STA, AP2: 3 STA Client signal re-evaluated every 1 second and moved to strongest AP within the VirtualAP. Data rate maximized by assigning to AP with strongest signal as clients roam about. AP1 Channel 1 VirtualCell AP2 After Periodic Load Balancing AP1 Channel 1 VirtualCell AP2 Example Load Balancing Across two VirtualCells ◆ ◆ After initial assignment, AP1: 7 STA, AP2: 3 STA AP3: 4 STA, AP4: 6 STA Within each VirtualAP, the client signal is reevaluated over time and moved to strongest AP within the VirtualAP (refer to slide 12). Example Settings: Max Stations per AP = 7 Max Stations per VirtualAP = 10 AP1 AP3 Channel 1 VirtualCell AP2 Channel 6 VirtualCell AP4 Dynamic Error Correction ◆ System monitors voice flow and when loss is detected due to outside interference, corrects the loss by interpolating the voice sample. ◆ Preserves voice quality when errors/loss occurs. Dynamic Error Correction Example Voice Signal Without DEC RTP voice sample lost Voice Signal With DEC Meru Eliminates Trade-Off Between Backward Compatibility and 802.11g Throughput Critical in Voice Client (b) + Data Client (g) Deployments UDP 1g TCP 1g (with b clients present) (with b clients present) ~22.6 TCP 1g +1b g client perf. ~10.1 ~15.8 ~10.3 ~14.8 ~3.4 Others Meru Source: Meru Lab Tests Others Meru Others Meru Comparative Results Density: >3X better Meru Other Leading AP/WLAN Systems 128 clients/AP ~ 15 clients/AP Fairness: only product with time fairness Throughput: 50% better in bg UDP (bg mode) 22.6Mbps 14.8Mbps TCP (bg mode) 17.5Mbps 10.9Mbps Handoff: 10X – 150X better Spectralink QoS Call Capacity First truly converged WLAN Chariot VoIP 30 calls Convergence 6 calls + 6 data 2.19ms (in Virtual AP mode) 50ms – 3000ms 10 calls/AP; works even with data clients loaded MOS up: 4.22 MOS Down: 4.26 MOS: 4.26 Data T’put: 5.6Mbps 8-9 calls/AP in unloaded AP; breaks with 2 – 3 data clients downlink MOS up: 1.58 kills uplink MOS Down: 4.29 4 calls did not completedata kills 2 calls MOS 1.5 voice Data T’put: 7Mbps Meru Has Significant Performance Advantage in Requirements for WLAN Deployments Aruba* Trapeze* Open 1000-3000** 1000-3000** 1000-3000** WPA 2000 8000 – 9000 2000 ms 802.11g client throughput, in presence of b clients 10.9 Mbps 7.6 Mbps 10.9 17.5 Mbps 1.5X Density of data Clients ~15-20 ~15-20 ~15-20 128 5X Handoff (ms) * Magazine Tests ** Depends on client card capabilities Meru Meru Advantage Airespace* No Client Handoff (2 ms switchover in backend) 50 – 150X 100 – 400X Customer Examples Hyatt Osaka Hotel Data and Voice Deployment Floor 39 Floor … ◆ 28 Floors + Conference Center Floor 5 Managed IP Centrex Service Provided By VoIP Service Provider PDAs Floor 4 ◆ ◆ ◆ Wireless Data access for guests Floor 3 VoWLAN handsets for internal staff communications VoIP carrier providing services WAN WiFi Phones Conference Floor Data Center Meru Controller University of Miami Hospital Data Application and Voice ◆ Largest Healthcare system in Southeast with 6000 member community ◆ Multiple applications – data, voice, PDA, medical carts, laptops ◆ Meru Benefits: ● “Meru delivered an easily managed, future-proof system at a significant cost savings. Its standardscompliant solution supports Quality of Service for real-time applications, single channel operations for co-channel interference mitigation, and the ability to seamlessly integrate with our existing backend infrastructure and security processes.” - Chris Bogue, IT Director ● ● Ease of deployment Reduced costs Predictable service with over-the-air QoS Meru Selected For World's Largest FMC Deployments: Validating Meru’s VoIP Wireless Leadership Position ◆ Osaka ● ● ● $9B Revenue 50 Offices: 6000+ DoCoMo Dual Mode Phones Competed with Cisco, NEC and others ◆ Large ● ● ● Gas: Large Utility Construction Company US$18B annual revenues Nationwide in Japan, offices in Asia, US, UK 9000+ Dual Mode Phones Live Shots Live Shots Danke / Thank you