Site Survey Tool - TamoGraph

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System Requirements
Driver Installation
Licensing and Trial Version Limitations
Interface Overview
Access Point List
Floor Plan / Site Map
Plans and Surveys, Properties, and Options Panel
Main Menu
Performing a Site Survey
New Project Wizard
Data Collection
Understanding Survey Types: Passive, Active, and Predictive
Active Survey Configuration
Best Practices, Tips, and Tricks
Survey Job Splitting
Predictive Surveys
Drawing Walls and Other Obstructions
Drawing Attenuation Zones
Placing and Configuring Virtual APs
Working with Presets
Applying Visualizations
Working with Multi-floor Sites
Mixing Real and Virtual Data
Best Practices, Tips, and Tricks
Analyzing Data – Passive and Predictive Surveys
Selecting Data for Analysis
Adjusting AP Locations After Passive Surveys
Splitting an AP into Multiple Unique APs
Working with Multi-SSID APs
Visualization Types
Signal Level
Signal-to-Noise Ratio
Signal-to-Interference Ratio
AP Coverage Areas
Number of APs
Expected PHY Rate
Frame Format
Channel Bandwidth
Channel Map
Analyzing Data – Active Surveys
Selecting Data for Analysis
Visualization Types
Actual PHY Rate
TCP Upstream and Downstream Rate
UDP Upstream and Downstream Rate
UDP Upstream and Downstream Loss
Round-trip Time
Associated AP
Spectrum Analysis
Hardware Requirements
Spectrum Data Graphs
Performing Spectrum Analysis Surveys
Viewing Collected Spectrum Data
Exporting Spectrum Data
Reporting and Printing
Customizing Reports
Google Earth Integration
Configuring TamoGraph
Plans and Surveys
Plan / Map
Client Capabilities
Colors and Value Ranges
AP Detection and Placement
Visualization Settings
Configuring GPS Receiver
Using GPS Configuration Dialog
Finding the GPS Receiver Port Number
Taking Photographs
Voice Control
Using TamoGraph in a Virtual Machine
Frequently Asked Questions
Sales and Support

UDP Upstream and Downstream Rate

The UDP Upstream Rate and UDP Downstream Rate visualizations show UDP throughput rates measured in Mbps (megabits per second.) Throughput (also often referred to as “goodput”) is the amount of application-layer data delivered from the client to the server (upstream) or from the server to the client (downstream) per second. The protocol overhead is not included, so when we talk, for example, about the UDP throughput rate of 1 Mbps, we mean that 125 Kbytes of actual data payload were sent between two network nodes during one second, not including UDP, IP, and Ethernet or 802.11 headers.

Just like TCP throughput rates, UDP throughput rates are one of the most important real-world metrics of a WLAN, because they determine the end user experience and network-related application performance. Unlike TCP, UDP is typically used in audio and video streaming applications, such as VoIP, so UDP throughput metrics might give you an insight into expected VoIP quality.

Double-clicking on the UDP Upstream and Downstream Rate legend on the status bar allows you to configure the color scheme and change its value range.

Suggested Solutions

When low throughput areas are discovered, the following solutions are suggested:

· Verify that the actual PHY rate is sufficient. Throughput rates cannot exceed PHY rates; in practice, they are about 50% lower than PHY rates. For example, if the PHY rate in the given area is only 2 Mbps, you should not expect the throughput rate to exceed 1 Mbps. In practice, it might be as low as 0.1 or 0.2 Mbps, depending on other conditions.
· Other common reasons for low throughput rates are interference and excessive network traffic. The Signal-to-Interference Ratio visualization available for passive surveys might provide insight into interference issues. Excessive network traffic might be caused either by oversubscription (too many clients per AP) or by excessive network load by some clients. The former can be addressed by increasing the number of APs, while the latter should be verified and handled by network traffic monitoring software.
· The client-AP part of the link might not be the bottleneck. Even if the wireless link quality is excellent and provides high throughput rates, the wired side of the network might be the problem. For example, if the throughput test server utility is running on a computer equipped with a 100 Mbps adapter, your throughput rates in this test will never exceed 80 or 90 Mbps, despite the fact that the wireless side of the link might provide 150 or 200 Mbps throughput.  Make sure that the bandwidth of the wired side exceeds the bandwidth of the wireless side; check Ethernet adapter speeds, switch port speeds, cabling, etc. All the hardware between the client and server should support the speed of at least 1 Gbps.