1 / 46

Designing and Deploying Wireless IP Communications Systems

Designing and Deploying Wireless IP Communications Systems. Mike Coffin TME IPCBU/VTG. Enterprise Mobility - Market Overview. Enterprise Customer Demand: IPC mobility is becoming enterprise requirement to meet increasing number of mobile workers needs

gaye
Download Presentation

Designing and Deploying Wireless IP Communications Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Designing and Deploying Wireless IP Communications Systems Mike CoffinTME IPCBU/VTG

  2. Enterprise Mobility - Market Overview • Enterprise Customer Demand: • IPC mobility is becoming enterprise requirement to meet increasing number of mobile workers needs • IPC mobility is an integrated call control and voice application solution that customers wish to purchase directly from IPT vendor • Enterprise IPC Mobility solution categories: • Single mode solutions (i.e. 7920s for wireless enterprise voice) • Single number reachability (i.e. IP PBX extension to cellular application) • Dual mode solutions (i.e. two line DM, call hand-off, etc.)

  3. Voice over WLAN How to Justify Employee Productivity • Reduced call backs, fewer call attempts • Single mailbox, fewer duplicate messages • Flexibility: choice of device and location for calls • End-to-end IP telephony Customer Satisfaction • Increases speed of response • Flexible communication flow with media choices • Personalized service • Location and Identification services OPEX Reductions • Predictable/controllable cellular expenses • Least cost routing/Intelligent on corporate network • Better visibility, better control Device consolidation

  4. VoWLAN Market Figures • IPC (wired/wireless) is growing at 19% CAGR • ~6% of WLANs are currently running VoWLAN (SMB-Ent) increasing to ~20% in 2007 • 36% of IPC customers view mobility as the driving app today increasing to 47% by 2007 • Of the VoWLAN deployments, 50% are using a single mode phone • Singlemode share is expect to decrease to 38% by 2007 • Dualmode share is expect to increase to 37% by 2007 Source: Infonetics 2005

  5. Re-seize the security high ground • Thought Leadership in key areas • MFP • Location Awareness (LBAC and IDS) • NAC, NIC, Multi-Layer IDS Innovation Deployment Success • Deployment guidance • WLAN/Network readiness assesment Unification & InvestmentProtection Messaging Wireless Voice Strategy • Thought Leadership in key areas • Advanced QoS/CAC • Wide support for handsets • Enabling technologies – HD/Mesh/e911 Extend IPC investmentsthrough mobility • Mobility a driver for convergence • Costs savings +productivity increase

  6. Cisco Self-Defending Network Advanced Mobility Services • Unified built-in support of leading edge applications - not an after thought. Cisco Wireless Location Appliance, Wi-Fi phones, and Guest Access • World Class NMS that visualizes and helps secure your air space. Cisco Wireless Control System (WCS) Seamless network infrastructure across a range of platforms. Cisco 4400, 2000 Wireless LAN Controllers. Cisco Catalyst 6500 Series WiSM, ISR and 3750 integration. Mobility Platform APs dynamically configured and managed through LWAPP. Cisco Aironet Access Points: 1500, 1300, 1240AG, 1230AG, 1130AG, and 1000. Bridges: 1400 and 1300. World-Class Network Management Network Unification Client Devices A Business Class Wireless Experience What's in Business Class Wireless? Future Secure clients that work out of the box

  7. A Comprehensive VoWLAN Solution Headquarters – New York Branch Office – Newark, NJ • Cisco Integrated Services Router (ISR) Pair • WAN Access • Security Services (FW, IDS, CSA, VSM etc.) • VoIP Gateway • HSRP • Cisco ISR • Security Services (FW, IDS, etc.) • VoIP Gateway • SRST T1 • Integrated Wired & Wireless Network • Wireless AP’s • WLSE Express Management • Integrated Wired and Wireless Network • WLSM for Fast Secure L3 Roaming • Aironet WLAN Infrastructure with WLSE Mgt/Control WAN Wireless Voice Clients PSTN DSL Branch Office – Austin, TX • Wireless Voice Clients • Cisco 7920 • CCX clients • Partner Clients • Cisco IPC Client • Cisco ISR • Security Services (FW, IDS, etc.) • VoIP Gateway • SRST Internet • Integrated Wired & Wireless Network • Wireless AP’s • WLSE Express Management • IPC Infrastructure • CallManager • Unity • Conferencing Media Gateways • MeetingPlace Wireless Voice Clients

  8. Unified Wireless Network • Lightweight solution • Lightweight AP + WLAN controller + Cisco WCS • Features • High-accuracy location • Downstream WLAN QoS • APIs for software integration • Benefits • Ease of use and simplified deployment • Protection from unauthorized access and WLAN attacks • Scalability with controller clustering • Reliability N:1 automated failover • Location aware • Leadership • Dual Band AP deployment with simultaneous support of 802.11a and 802.11g • Estimated 14 simultaneous calls per AP for .a and 7 simultaneous calls per AP .g • Cisco has proven experience deploying VoWLAN in the enterprise • White Papers, Deployment Guides, Presentations, Training, etc. • Leverage Cisco Advanced Services to accelerate voice over WLAN expertise Cisco WLAN Office Controller Cisco Lightweight APs Cisco WCS Cisco WLAN Remote Office Controller Cisco Lightweight APs

  9. What Does an Enterprise WLAN Needfor Wireless Voice ? Cisco Wired + Wireless Infrastructure • Good Voice Quality • Security • Fast Roaming • Ubiquitous Coverage • Scalability • Long Battery Life • Troubleshooting Tools • Managed RF Environment Centralized Management Controllers & Switches Controllers Cat 6500 Series Wireless Access Points BR1300 AP1200 AP1130 Cisco-brand & Cisco-Compatible Clients

  10. CCX v2 Innovating in VoWLAN with • GPR handling • Roaming element • Voice metrics CCX Version 4 is what we need clients to be at for dense deployments CCX v5 • Fast Roaming/CCKM (PEAP/TLS/TTLS) • QBSS Load IE • CAC (TSPEC) • U-APSD • Traffic stream metrics CCX v4 • WME compliance • Fast Roaming/CCKM (FAST) CCX v3 • Client Tx sync • AP neighbor list • Fast Roaming/CCKM (LEAP)

  11. Benefits of Cisco’s VoWLAN Solution • Enterprise-class Security • WPA encryption + 802.1X authentication • Secure, Low-Latency Roaming between AP’s and Subnets • Using standards-based security (WPA + 802.1X) • Improved Battery Life • Proxy ARP allows phone to skip broadcast/multicast beacons, so device can wakeup/go-to-sleep more quickly and stay in doze mode for longer periods of time • Substantial improvement in standby time • Savings depends on the amount of broadcast/multicast traffic on the network • Transmit Power Sync reduces transmit power, resulting in improved talktime • QoS for prioritization of voice traffic over data traffic • Supports converged voice + data WLAN networks • Fully compatible with installed base of 802.11 clients • Wi-Fi Standard WMM-based QoS now available on Cisco AP’s

  12. Why New Site Surveys? • Increased roaming with VoWLAN • Coverage must be seamless with adequate overlap for smooth roaming handoffs • Old site surveys need to be revisited to ensure the WLAN meets the VoWLAN requirements

  13. Typical WLAN Data Topologies Wireless “Cell” Wireless “Cell” Channel 1 Channel 6 LAN Backbone Overlapping 10-15% Access Point Access Point Wireless Clients Wireless Clients

  14. Single Floor Site Survey for Voice: 802.11b Ch 11 Ch 11 Ch 6 Ch 1 Ch 1 Ch 6 Ch 6 Greater Overlap Needed

  15. IDEAL VoWLAN RF ENVIRONMENT Cisco Unified Wireless IP Phone Cells Should Have Overlap of 15-20% Redundancy throughout cell -67dbm at Edge (see deployment guide for recommendations) Maintain Proper Separation of Cells (see deployment guide for recommendations)

  16. Multi-Floor Site Survey AP 4 Ch 1 Flr 4 AP 3 Ch 6 Flr 3 AP 2 Ch 11 Flr 2 AP 1 Ch 1 Flr 1

  17. Ideal Environment • Reduction of noise • Noise leads to static and choppy voice • More APs / clients will increase the noise levels • Proper RF overlap • Faster / smoother roaming • Provide a secondary AP if one of the APs is unavailable or congested • Load-Balancing • Correct data rates • Faster data transmissions, reduction of AP utilization, more calls per AP

  18. Ideal Environment • Minimum 2 access points on non-overlapping channels at all times with: • RSSI >= 35 (minimum value) -67dBm • CU (QBSS) load < Max Threshold • Provides for redundancy and load-balancing Definitions: • RSSI (Received Signal Strength Indicator) • CU (Channel Utilization) • QBSS (QoS Basic Service Set)

  19. Ideal RF Environment • Non-overlapping cells are 22 MHz apart • 1, 6, 11 (North America) • 1, 6, 11 or 2, 7, 12, etc. (Europe and Japan) • Do not have to be exactly 5 channels apart (i.e. 1, 7, 13) Channels 1 2 3 4 5 6 7 8 9 10 11 12 13 14 2.402 GHz 2.484 GHz 22 MHz

  20. Non-Overlapping Channels • Phone will scan all channels at power up • Attempts to associate to AP with the highest signal • Will periodically scan all channels after association giving priority to discovered non-overlapping channels 11 1 1 11 6 11 6 1 1 6

  21. 802.11g Radios • Disable 6, 9, and 12 Mbps for 802.11g • Will reduce throughput if enabled • Set 802.11g rates as “enable” vs. “required” • 7920 phones are 802.11b only • Enable all other 802.11g data rates for data devices

  22. Signal to Noise Ratio (SNR) • Signal of -67 dBm or higher • Packet Error Rate (PER) no higher than 1% • Minimum SNR of 25dB = -92dBm noise level Power (dBm) RSSI / Signal Strength Signal to Noise Ratio Noise Level Time (Seconds) Adding signal does not always increase SNR

  23. Recommended SNR Values

  24. COMPARISON OF 802.11 SPECTRUM– Throughput & Channels

  25. Dynamic Transmit Power Control (DTPC) • Set the same transmit power on the AP and on the phones • If using an AP that supports DTPC, then ensure client power matches the local AP power • (Do not use default setting of Max power) • If the AP does not support DTPC, then need to statically set the phone’s transmit power to match the AP with the highest transmit power in the WLAN (default 7920 setting = 20mW) • Prevents one-way audio • i.e. RF traffic is only being heard in one direction 100mW 20mW

  26. Multi-Path • AP antennas need placements that are away from reflective surfaces • Maximize line of sight Ceiling P1 RX TX P2 P3 NEVER MOUNT ANTENNAS NEAR METAL OBJECTS or REFLECTIVE SURFACES Obstruction Floor

  27. Diversity • Match the antenna types and ensure they cover the same radio pattern • If using cable extenders, should be the same length and type

  28. Ideal Environment • G.711 - 7 concurrent voice streams • G.729 - 8 concurrent voice streams (# of 7920s on call per AP) • Call numbers are with Voice Activity Detection (VAD) disabled, which is recommended • Voice quality maintained with standard data traffic on AP Note: These numbers can vary depending on the specific RF environment and the amount of data traffic

  29. Set Expectations • Difficult to achieve 99.999% availability with VoWLAN (2.4 Ghz) • The better the RF environment is controlled the better the quality will be • Coverage in elevators is challenging • Recommended to use CCKM when doing 802.1x authentication otherwise voice gaps may exist during roaming

  30. Site Survey Site Survey Process • Identify areas in the physical environment where there is non 802.11 RF interference • Identify and eliminate rogue APs • Identify key utilization requirements • Determine proper AP location and transmit power levels • Proper configuration of APs • Proper configuration on network and server

  31. Pre-Site Survey Form • Assists you in the assessment • Type of survey needed • How long it will take • Equipment needed • Introduction to the customer’s facility • General fact gathering form

  32. Site Survey • Survey each floor individually then combined to check leakage • Ensure testing is done with users and wireless network traffic • Do not assume all channels can be used in every environment • Try to logically segment subnets based on roaming behavior • Keep in mind users will talk in locations where they don’t normally use wireless data • Staircases • Quiet locations

  33. Off-hours or Green Site Survey • No noise during site survey, however will be post deployment • Measure noise during the day or at other similar deployments • Equivalent number of people and devices • Similar type of RF utilization

  34. Evaluate Key Areas File / Supply Room (Large Filing or Metal Cabinets) Elevator Shafts Office Test Lab Break Room (Microwave Ovens - 2450 Mhz) Conference Room Stairwells (Reinforced Building Area) Cubes VIP (CEO)

  35. Site Maps High Capacity Area Stock Room—Metal Shelves Cubes Coverage Not Required Parking Garage Office Low Capacity Areas

  36. Site Survey Report • Be very specific when describing locations • Use tape and facility markers • A picture is worth 1,000 words • Antenna orientation • Not all installers familiar with the equipment • The more directional an antenna is, the more important the orientation description has to be

  37. Incorrect Placement of APs • Incorrect placement of APs can lead to coverage or quality issues Move AP a minimum of 2 feet from metal beam

  38. Incorrect Placement of APs • Mount a wood board between metal tracks

  39. Incorrect Antenna Orientation • Antennas are pointing incorrectly • Point the antennas toward the desired coverage area

  40. Long-Term Site Survey Report • Site survey report is required for the life of the WLAN deployment • Configurations of the APs • Location of the APs • Channel and transmit power map • Switch port configurations • AP model types • Coverage map per frequency • Antenna type per AP

  41. Tools for VoWLAN Site Surveys • WLSE assisted site survey tool is currently NOT recommended for voice deployments (The minimum cell overlap for seamless roaming is not present) • WLSE is recommended for managing APs post-deployment • Use tools like Airmagnet Analyzer and Surveyor, Cognio Spectrum Anaylzer • Finish using end-user devices such as Cisco Unified Wireless IP Phone 7920 and wireless laptops to ensure 100% coverage and quality

  42. Installation and Network Verification • As important as site survey • Insures entire system works as designed • Make actual phone calls to test voice quality • Phone equipment requirements: • Headsets to monitor RSSI and communicate on Cisco Unified Wireless IP Phone 7920 • Call between Cisco Unified Wireless IP Phone 7920 and wired Cisco Unified IP phone • Wired infrastructure pre-requisite: • Proper wired network must be in place • www.cisco.com/go/srnd

  43. 1 4 2 Conference Room 3 Installation Verification • Suggested test areas: • Primary area of each AP cell (1) • Any location where there might be high call volume (2) • At the fringes of an AP’s coverage area (3) • Areas of where overlap might be questionable (4) • At locations where coverage might be slightly questionable but still need to be certified (i.e. stairwells, bathrooms, etc.)

  44. Wireless Voice Verification Plan (WVV) • Important every time changes are made to: • Wired network • Wireless network • Physical environment • End user devices • (Voice or data)

  45. Q and A

More Related