About ZCorum. Established in 1995 Privately Held No Venture Capital Three Offices. Corporate Headquarters in Alpharetta, GA Two Contact Centers

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About ZCorum Established in 1995 Privately Held No Venture Capital Three Offices Corporate Headquarters in Alpharetta, GA Two Contact Centers

2 About ZCorum Established in 1995 Privately Held No Venture Capital Three Offices Corporate Headquarters in Alpharetta, GA Two Contact Centers Swainsboro, GA Gordon, GA OUR MISSION To be a world-class communications company built upon strong affiliate relationships and uncompromising customer service.

3 Managed Broadband Solutions Managed Broadband Services Advance Provisioning Private-Label Residential & Commercial VoIP Engineering Services Network Monitoring Internet Security Broadband Diagnostics Tools Customer Care & Tech Support Commercial Services Google Apps for Business Digital Voice Network Support Services Web Hosting Personal Cloud Device Hardware Sales

4 Why is WiFi So Challenging to Troubleshoot? Lack of information is the biggest hurdle. Customers don't understand the technology, but are relying on it more everyday More devices with varying qualities of implementations of the standards. WiFi is inherently variable in performance, much more so than our DOCSIS or fiber WAN protocols

5 Current WiFi Protocols n, most current protocol for 2.4GHz but also works at 5.8GHz. 20 or 40 MHz channels with OFDM modulation MIMO, but most clients, except laptops, lack support 20 MHz speed profiles: 7.2, 14.4, 21.7, 28.9, 43.3, 57.8, 65, MHz speed profiles: 15, 30, 45, 60, 90, 120, 135, ac, newest and highest performance but only 5.8 GHz. 20, 40, 80, or 160 MHz channels with OFDM modulation MIMO, but most clients, except laptops, lack support. 20 MHz speed profiles: 7.2, 14.4, 21.7, 28.9, 43.3, 57.8, 65, 72.2, 86.7, MHz speed profiles: 15, 30, 45, 60, 90, 120, 135, 150, 180, MHz speed profiles: 32.5, 65, 97.5, 130, 195, 260, 292.5, 325, 390, MHz speed profiles: 65, 130, 195, 260, 390, 520, 585, 650, 780, 866.7

6 Numbers to Know WiFi accounts for ~50% of tech support complaints. 7 billion new WiFi devices estimated to be in use between now and the end of 2017 according to Sys-Con According to the Arris CEI 54% of consumers want their WiFi to have better range than it does now 72% of consumers want WiFi in every room 29% already have installed a WiFi repeater

7 Good Installs Can Prevent Problems Location of the WiFi AP(s) is a critical part of getting good WiFi service in the home. Not all homes or businesses can be serviced with a single AP. Talking with customers to understand where video streaming players are located is critical to determining the best arrangement.

8 Automated Channel Selection Often Fails CH 11

9 RSSI Equals Performance, Usually

10 Use 5.8 GHz Where Possible 5.8 GHz has 12 non-overlapping channels as opposed to the three in 2.4 GHz and is less utilized by non WiFi transmitters.

11 Parameters You Can Tune for Better Performance Disable lower speed WiFi profiles. Disable older WiFi protocols, especially b. Lower the output power, especially in MDU installs. In single family homes enabling 40 MHz wide channels can relieve contention, but in densely populated areas that leads to more interference. Make certain that Wireless Multimedia Extensions are enabled.

12 Post Install Steps Test performance at critical locations, especially where streaming video is expected. Link speed and actual throughput tests are important as some errors only show under load. Look for legacy devices, especially b only devices. Look for interference, this can often only be seen as errors on the AP. Check coverage to see if additional APs are needed.

13 How to Test Performance Get data from the AP via SNMP and/or TR-069 Clients with low RSSI and link speed need to be addressed

14 How to Test Performance Log into the AP's web interface. Most present some information on each client. Look for RSSI, connection speeds, and error counts. Error counts often only increment under load. Get information from a client. Laptops give the most information, but some is available from mobile devices.

15 Windows 7 and Newer C:\WINDOWS\system32>netsh wlan show interfaces There is 1 interface on the system: Name Description : Wi-Fi : Broadcom ac Network Adapter GUID : 9e768e88-f a08 ffaf120c9bf77 Physical address : 54:27:1e:97:ec:30 State SSID BSSID : connected : zcorum-private : b8:a3:00:28:aa:bb Network type : Infrastructure Radio type : n Authentication Cipher : WPA2-Personal : CCMP Connection mode Channel Receive rate (Mbps) Transmit rate (Mbps) Signal : Auto Connect :6 : 130 : 130 : 88% Profile : zcorum-private Hosted network status : Not available

16 Android Devices Click on the WiFi network to get details on the current connection. Remember, virtually all mobile devices will be 1x1 and limited to 20 MHz channels.

17 Mac OSX Open the Network Utility from Spotlight. (Command+Spacebar)

18 WiFi Repeaters Most cause more problems than they solve Will cut the performance of the network by 50% in order to increase coverage. Very easy to install and difficult for the MSO to detect or diagnose

without sacrificing performance Are designed for remote

19 WiFi Extenders Have a wired connection (Ethernet, MoCA, power line, etc) back to the home gateway Expand coverage without sacrificing performance Are designed for remote management, normally via TR-069 Several vendors are offering models

20 Self Organizing Networks and Radio Resource Management CableLabs standard to allow for devices to managed externally for optimal performance. Allows for APs to have their channel plans, power, and other parameters tuned in real time without manual intervention. Should result in noticeably better performance, especially in areas of channel contention

21 802.11ad 60 GHz single channel OFDM Speeds of ~5 Gbps Limited range, typically only a single room

22 802.11ah HaLow 900 MHz in the US, varies world wide but all sub GHz Speeds of ~100 kbps Long range Very low power possible, ideal for IoT devices

23 Facebook.ZCorum.com Twitter.com/ZCorum Youtube.com/ZCorum Blog.ZCorum.com

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CWNP PW Certified Wireless Analysis Professional. Download Full Version : CWNP PW0-270 Certified Wireless Analysis Professional Download Full Version : http://killexams.com/pass4sure/exam-detail/pw0-270 QUESTION: 50 ABC Company is having VoWiFi latency problems on their 802.11g