Monitoring Location Servers and Site


This chapter describes how to monitor location servers by configuring and viewing alarms, events, and logs.

It also describes how to use Cisco WCS to view location server, client and asset tag status.

This chapter contains the following sections:

Working with Alarms

Working with Events

Working with Logs

Generating Reports

Monitoring Location Server Status

Monitoring Wireless Clients

Monitoring Wireless Clients Using Search

Monitoring Chokepoints

Working with Alarms

This section describes how to view, assign, and clear alarms and events on location servers using Cisco WCS. Details on how to have email notifications for alarms sent to you is described as well as how to define those types (all, critical, major, minor, warning) of alarm notifications that are sent to you.

Viewing Alarms

To view location server alarms, follow these steps:


Step 1 In Cisco WCS, choose Monitor > Alarms.

Step 2 Click the Advanced Search link (top-right). A configurable search panel for alarms appears (see Figure 8-1).

Figure 8-1 Search Alarm Panel

Step 3 elect Alarms as the Search Category.

Step 4 Select the Severity of Alarms to display. Options are All Severities, Critical, Major, Minor, or Warning.

Step 5 Select Mobility Service from the Alarm Category.

Step 6 Select the time frame for which you want to review alarms by selection the appropriate option from the Time Period drop-down menu.

Options range from minutes (5, 15 and 30) to hours (1 and 8) to days (1 and 7). To display all select Any time.

Step 7 Check the Acknowledged State check box to exclude the acknowledged alarms and their count from the Alarm Summary window.

Step 8 Check the Assigned State check box to exclude the assigned alarms and their count from the Alarm Summary window.

Step 9 Select the number of alarms to display on each window from the Items per Page drop-down menu.

Step 10 To save the search criteria for later use, check the Save Search check box and enter a name for the search.

Step 11 Click Go. Alarms summary panel appears with search results.


Note Click the column headings (Severity, Failure Object, Owner, Date/Time and Message) to sort alarms.


Step 12 Repeat Step 2 to Step 11 to see Context-Aware notifications for the mobility services engine. Enter Context Aware Notifications as the alarm category in Step 5.


Assigning and Unassigning Alarms

To assign and unassign an alarm to yourself, follow these steps:


Step 1 Display the Alarms window as described in the "Viewing Alarms" section.

Step 2 Select the alarms that you want to assign to yourself by checking their corresponding check boxes.


Note To unassign an alarm assigned to you, uncheck the box next to the appropriate alarm. You cannot unassign alarms assigned to others.


Step 3 From the Select a command drop-down menu, choose Assign to Me (or Unassign) and click GO.

If you choose Assign to Me, your username appears in the Owner column. If you choose Unassign, the username column becomes empty.


Deleting and Clearing Alarms

If you delete an alarm, Cisco WCS removes it from its database. If you clear an alarm, it remains in the Cisco WCS database, but in the clear state. You should clear an alarm when the condition that caused it no longer exists.

To delete or clear an alarm from a location appliance, follow these steps:


Step 1 Display the Alarms window as described in the "Viewing Alarms" section.

Step 2 Select the alarms that you want to delete or clear by checking their corresponding check boxes.


Note If you delete an alarm, Cisco WCS removes it from its database. If you clear an alarm, it remains in the Cisco WCS database, but in the Clear state. You clear an alarm when the condition that caused it no longer exists.


Step 3 From the Select a command drop-down menu, choose Delete or Clear, and click Go.


Emailing Alarm Notifications

Cisco WCS lets you send alarm notifications to a specific email address. Sending notifications through email enables you to take prompt action when needed.

You can select the alarm severity types (critical, major, minor and warning) that are emailed to you.

To send alarm notifications, follow these steps:


Step 1 Display the Alarms window as described in the "Viewing Alarms" section.

Step 2 From the Select a commands drop-down menu, choose Email Notification, and click Go. The Email Notification window appears.


Note A SMTP Mail Server must be defined prior to entry of target email addresses for email notification. Choose Administrator > Settings > Mail Server Configuration to enter the appropriate information. You can also select the Administration > Mail Server link, if displayed, on the Email Notification window noted above.


Step 3 Click the Enabled box next to the Mobility Services.

Step 4 Click the Mobility Services link. The panel for configuring the alarm severity types (critical, major, minor and warning) that are reported for the location servers appears.

Step 5 Check box(es) next to all the alarm severity types for which you want email notifications sent.

Step 6 In the To field, enter the email address or addresses to which you want the email notifications sent. Each email address should be separated by commas.

Step 7 Click OK.

You are returned to the Email Notification window. The changes to the reported alarm severity levels and the recipient email address for email notifications are displayed.


Working with Events

You can use Cisco WCS to view location server and location notification events. You can search and display events based on their severity (critical, major, minor, warning, clear, info) and event category.

You can search by the following event categories:

By network coverage: coverage holes and interference

By link: mesh links

By notifications: location notifications

By product type: access points (rogue and non-rogue), clients, controllers, and location servers

By security

Additionally, you can search for an element's events by its IP address, MAC address, or Name.

A successful event search displays the event severity, failure object, date and time of the event, and any messages for each event.

To display events, follow these steps:


Step 1 In Cisco WCS, choose Monitor > Events.

Step 2 In the Events window:

To display the events for a specific element and you know its IP address, MAC address, or Name, enter that value in the Search field (top-right). Click Go.

To display events by severity and event category, click the Advanced Search link (top-right). Select Events as the Search Category and then select the appropriate options from the Severity and Event Category. Click Go.

Step 3 If Cisco WCS finds events that match the search criteria, it displays a list of these events.


Note For more information about an event, click the failure object associated with the event. Additionally, you can sort the events summary by each of the column headings.



Working with Logs

This section describes how to configure logging options and how to download log files.

Configuring Logging Options

You can use Cisco WCS to specify the logging level and types of messages to log.

To configure logging options, follow these steps:


Step 1 In Cisco WCS, choose Services > Mobility Services.

Step 2 Click the name of the location server that you want to configure.

Step 3 Choose System > Advanced Parameters (left). The advanced parameters for the selected location server appears.

Step 4 Scroll down to the Logging Options section and choose the appropriate option from the Logging Level drop-down menu.

There are four logging options: Off, Error, Information, and Trace.


Caution Use Error and Trace only when directed to do so by Cisco Technical Assistance Center (TAC) personnel.

Step 5 Check the Enabled check box next to each option listed in that section to begin logging of its events.

Step 6 Click Save.


Downloading Location Server Log Files

If you need to analyze location server log files, you can use Cisco WCS to download them into your system. Cisco WCS downloads a zip file containing the log files.

To download a zip file containing the log files, follow these steps:


Step 1 In Cisco WCS, choose Services > Mobility Services.

Step 2 Click the name of the location server to view its status.

Step 3 Choose System > Logs (left).

Step 4 Click Download Logs.

Step 5 Follow the instructions in the File Download dialog box to save the zip file on your system.


Generating Reports

In Cisco WCS, you can generate a device utilization and location utilization report for a location server. By default, reports are stored on the Cisco WCS server.

Once you define the report criteria, you can save the device and location utilization reports for future diagnostic use and run them on either an ad hoc or scheduled basis.

You can define the following criteria for a device utilization report:

Which location server or servers to monitor

How often the report is generated

How the data is graphed on the charts

Whether the report is emailed or exported to a file

You can view the following in a location utilization report:

Chart 1 summarizes and graphs CPU and memory utilization

Chart 2 summarizes and graphs client count, tag count, rogue client count, rogue access point count, and ad hoc rogue count

Creating a Location Server Utilization Report


Step 1 In Cisco WCS, choose Reports > Report Launch Pad.

Step 2 Choose Device > Utilization.

Step 3 Click New. The Utilization: New window appears (see Figure 8-2).

Figure 8-2 Device > Utilization Window

Step 4 In the Settings panel (left), enter a report title.

Step 5 The Report Type and Report By selections are always MSE (even when a location server).

Step 6 Select either a specific location server or All MSEs from the drop-down MSE menu.


Note Entering All MSEs reports location servers and mobility services engines.


Step 7 Enter the reporting period. You can define the report to collect data hourly, weekly basis, or at a specific date and time. The selected reporting period type will display on the x-axis.


Note The reporting period uses a 24-hour rather than 12-hour clock. For example, select hour 13 for 1:00 PM.


Step 8 In the Schedule panel (right), check the Enable Schedule check box.

Step 9 Select the export format (CSV or PDF) from the Export Report drop-down menu.

Step 10 Select either File or Email as the destination of the report.

If you select the File option, a destination path must first be defined at the Administration > Settings > Report window. Enter the destination path for the files in the Repository Path field.

If you select the Email option, an SMTP Mail Server must be defined prior to entry of target email address. Choose Administrator > Settings > Mail Server Configuration to enter the appropriate information.

Step 11 Enter a start date (MM:DD:YYYY) or click the calendar icon to select a date.

Step 12 Specify a start time using the hour and minute drop-down menus.

Step 13 Click one of Recurrence buttons to select how often the report is run.


Note The days of the week appear on the screen only when the weekly option is chosen.


Step 14 When finished with all of the above steps, do one of the following:

Click Save to save edits. The report is run at the designated time and the results are either emailed or saved to a designated file as defined in the Schedule panel.

Click Save and Run to save the changes and run the report now. The report is run and the results are either emailed or saved to a designated file as defined in the Schedule panel. The report runs again at the scheduled time.

At the results window, click Cancel to cancel the defined report.

Click Run Now if you want to run the report immediately and review the results in the WCS window. The report runs regardless of any pending, scheduled run of that report. Results appear at the bottom of the window. Click Save if you want to save the report criteria you entered.


Note You can also click Run Now to check a report scenario before saving it or to run reports as necessary.


Step 15 If you selected the Save or Save and Run option, click either Reports > Saved Reports (or Reports > Scheduled Runs if it has not yet run and is scheduled to run). The Utilization Reports summary window appears (see Figure 8-3).

Figure 8-3 Utilization Reports Summary Window

If the report is scheduled, it is shown as enabled and the next scheduled run date is noted.

If the report has run and is not scheduled to run again, it is shown as expired.

If the report has run and is scheduled to run again, it is shown as disabled.

Step 16 To enable, disable, or delete a report, check the check box next to the report title and click the appropriate button.


Viewing Saved Utilization Charts

To download a saved report, follow these steps:


Step 1 In Cisco WCS, choose Reports > Saved Reports.

Step 2 Click the Download icon for your report. It is downloaded and saved in the defined directory or emailed.


Viewing Scheduled Utilization Runs

To review status for a scheduled report, follow these steps:


Step 1 In Cisco WCS, choose Reports > Scheduled Runs.

Step 2 Click the History icon to see the date of the last report run.

Step 3 Click the Download icon for your report. It is downloaded and saved in the defined directory or emailed.


Monitoring Location Server Status

This section describes how to view location server status and how to enable status information polling.

Viewing Location Server Current Information

To view the current status of a location server, follow these steps:


Step 1 In Cisco WCS, choose Services > Mobility Services.

Step 2 Click the name of a location server to view its status.

Step 3 Click System > Advanced Parameters to display location server status.


Note For details on configuring advanced parameters, refer to the "Configuring Advanced Parameters" section on page 4-5.


Information for the selected location server found on the Advanced Parameters window is summarized in Table 8-1.

Table 8-1 Advanced Parameters for Location Servers 

Page Heading
Description

General Information

Product name, version, time server started operation, time zone, hardware restarts, active sessions, number of tracked elements and tracked element limit.

Note A major alert appears on the Advanced Parameter window if the tracked elements limit of 2,500 for the location server is reached.

Cisco UDI

Product identifier, version identifier, and serial number.

Logging Options

Types of occurrences and level (off, information, error, trace) being logged.

Note Use Error and Trace only when directed to do so by Cisco Technical Assistance Center (TAC) personnel.

Advanced Parameters

Number of days to keep events, Session Time out, Interval between data cleanup and enabled/disable status of Advanced Bug operation.

Note To modify these values, refer to the "Viewing and Configuring Advanced Parameters" section on page 4-4.

Advanced Commands

Commands: Reboot Hardware, Shutdown Hardware, Clear Configuration and Defragment Database.


Monitoring Wireless Clients

Monitoring Wireless Clients Using Maps

On a Cisco WCS map, you can view the name of the access point that generated the signal for a client, its strength of signal, and when the location information was last updated for the client. Move the cursor over the client icon on the map to display this information.

You can also view the client details window, which provides statistics (such as client association, client RSSI, and client SNR), packets transmitted and received values, events, and security information for that client.

To determine a client's location status on a map and view its client details window using maps, follow these steps:


Step 1 In Cisco WCS, choose Monitor > Maps.

Step 2 Choose the building and floor on which the mobility services engine and its clients are located.

Step 3 Check the Clients check box in the Floor Settings panel (left), if it is not already checked (see Figure 8-4).


Note Do not click Save Settings unless you want to save changes made to the floor settings across all maps.


Figure 8-4 Monitor > Maps > Building > Floor Window

Step 4 Move the cursor over a client icon (blue square) and a summary of its configuration appears in a pop-up panel.

Step 5 Click the client icon to see client details (see Figure 8-5 and Figure 8-6).

Figure 8-5 Client Details Window (1 of 2)

Figure 8-6 Client Details Window (2 of 2)


Monitoring Wireless Clients Using Search

You can view client information in summary and in detail at the Monitor > Clients window and on maps (Monitor > Maps).

To view client information, follow these steps:


Step 1 In Cisco WCS, choose Monitor > Clients.

The Clients summary window appears.

Step 2 Select Clients Detected by MSEs from the Show drop-down menu. Click Go.

A summary of all clients detected by all mobility services engines and location appliances managed by Cisco WCS displays (see Figure 8-7).

Figure 8-7 Monitor > Clients Window

a. To find a specific client by its IP address, name, SSID or MAC address, enter that value into the Search field in the navigation bar (not all search values apply to all clients).

For example, if you enter a MAC address in the search field, the following window appears (see Figure 8-8).

Figure 8-8 Search by MAC address Results

1. To see more configuration details about the client, click View List for the client item type. Details shown include associated devices (access point, controller), map location, VLAN, protocol, and authentication type.

2. To see alarms for the client, click View List for the alarm item type. A listing of all active alarms for that client noting severity, failure source (alarm description), owner of alarm (if assigned), date and time of the alarm, and whether or not alarm is acknowledged (see Figure 8-9).

Figure 8-9 Alarm Summary for Client


Note You can also assign or unassign the alarm, email it, delete or clear it, and acknowledge and unacknowledge it at this window by selecting the appropriate option from the Select a command drop-down menu.


b. To search for a client or multiple clients by device, network, map location and type of client (regular, rogue, or shunned), use Advanced search located in the navigation bar.

You can further define the client category by: all clients, all excluded clients, all wired guest clients, and all logged in clients using the Search By drop-down menu (see Figure 8-10).

Figure 8-10 Advanced Search Window

Step 3 Click on the appropriate client.


Monitoring Tags

You can monitor tag status and location on Cisco WCS maps as well as review tag details on the Monitor > Tags window. You can also use Advanced Search to monitor tags.

Monitoring Tags Using Maps

On a Cisco WCS map, you can view the name of the access point that generated the signal for a tagged asset, its strength of signal, and when the location information was last updated for the asset. Move the cursor over the tag icon on the map to display this information.

To enable tag location status on a map, follow these steps:


Step 1 In Cisco WCS, choose Monitor > Maps.

Step 2 Choose the building and floor on which the mobility services engine and tag are located.

Step 3 Check the 802.11 Tags check box in the Floor Settings panel (left), if it is not already checked (see Figure 8-11).


Note Do not click Save Settings unless you want to save floor setting changes across all maps.


Figure 8-11 Monitor > Maps > Building > Floor > Tag Window

Step 4 Move the cursor over a tag icon (yellow tag) and a summary of its configuration appears in a pop-up panel.

Step 5 Click the tag icon to see tag details (see Figure 8-12).

Figure 8-12 Tag Details Window

Step 6 To see location history for the tag, select Location History from the Select a command drop-down menu. Click Go (see Figure 8-13).

Figure 8-13 Tag Location History Window

Monitoring Tags Using Search

You can search for tags by asset type (name, category and group), by MAC address, by system (controller or MSE), and by area (floor area and outdoor area).


Note Search by MSE includes location appliances.


You can further refine your search using the Advanced search parameters and save the search criteria for future use. Choose Saved Searches located in the navigation bar to retrieve saved searches.

When you click on the MAC address of a tag location in a search results window, the following details appear for the tag:

Tag vendor

Controller to which tag is associated

Telemetry data (CCX v1 compliant tags only)

Telemetry data displayed is vendor-specific; however, some commonly reported details are GPS location, battery extended information, pressure, temperature, humidity, motion, status, and emergency code.

Asset Information (Name, Category, Group)

Statistics (bytes and packets received)

Location (Floor, Last Located, MSE, map)

Location Notification (Absence, Containment, Distance, All)

Emergency Data (CCX v1 compliant tags only)

To search for tags, follow these steps:


Step 1 Choose Monitor > Tags. The Tag Summary window appears (see Figure 8-14).

Figure 8-14 Monitor > Tags Window

a. To view a summary of tags associated with a specific location appliance or mobility services engine, click the Total Tags link (see Figure 8-15).

Figure 8-15 Total Tags Listing by Mobility Services Engine and Location Appliance


Note If the listing of tags is lengthy, you can use Search or Advanced Search to isolate a specific tag.


b. To search for a specific tag, if you know its MAC address, name or VLAN ID (not all search values apply to all tags) use Search which is found in the navigation bar.

c. To search for a specific tag or multiple tags using a broader range of search categories such as device (MSE or controller), map location (floor or outdoor area), asset name or category, or tag vendor use Advanced Search which is found in the navigation bar (see Figure 8-16).

1. In the Advanced Search panel, select Tags as the search category.

2. Select the additional tag search criteria. Refer to Table 8-2 for a list of search criteria and their possible values.

3. Click Go when all advanced search parameters are selected. Results are shown in Figure 8-17.


Note If no tags are found based on the selected search criteria, a message appears noting this as well as the reason why the search was unsuccessful and possible actions.


Figure 8-16 Advanced Search Panel for Tags

Figure 8-17 Advanced Search Results for Tag


Note If you click the MAC address of any of these tags, a Tag details window appears similar to that in Figure 8-12.


Table 8-2 lists search criteria and their possible values.

Table 8-2 Tag Search Criteria and Values

Search Criteria
Variable Search Criteria
Possible Values

Search for tags by (Tier 1 search criteria)

                    —

All Tags; Asset Name, Asset Category or Asset Group; MAC Address; Controller or MSEs; Floor Area or Outdoor Area.

Note MSE search includes both location servers and mobility services engines.

Search In (Tier 2 search criteria)

                    —

WCS Controllers or MSE.

Note WCS Controller option indicates that the search for controllers is done within WCS.

Note MSE search includes both location servers and mobility services engines.

Last detected within

                    —

Options are from 5 minutes to 24 hours.

Variable search criteria. (Tier 3 search criteria)

Note Possible search criteria determined by the Search for tabs by (Tier 1 search) value.

If Search for tags by value is:

1. Asset Name, then enter Tag Asset Name.

2. Asset Category, then enter Tag Asset Category.

3. Asset Group, then enter Tag Asset Group.

4. MAC Address, then enter Tag MAC Address.

5. Controller, then select Controller IP address from drop-down menu.

6. MSE (when system is a location server), then choose a location server IP address from drop-down menu.

7. Floor Area, then choose Campus, Building and Floor Area.

8. Outdoor Area, then choose Campus and Outdoor Area.

Show Telemetry Tags only

                    —

Check box to display telemetry tags. Leaving option unchecked displays all tags.

Note Option only seen when MSE (select for location servers), Floor Area or Outdoor Area are selected as the Search for tags by option.

Note Only those vendor tags that support telemetry appear.

Tag Vendor

                    —

Check box to select tag vendor from drop-down menu.

Note Option does not display when Asset Name, Asset Category, Asset Group or MAC Address are the search criteria for tags.

Save Search

                    —

Check box to name and save search criteria. Once saved, entry appears under Saved Searches heading (left-panel).

Items Per Page

                    —

Select the number of tags to display per search request. Values range from 10 to 500.



Overlapping Tags

When multiple tags are within close proximity of one another a summary tag is used to represent their location on a WCS map (Monitor > Maps). The summary tag is labeled with the number of tags at that location.

When you move the mouse over the overlapping tag on the map, a panel appears with summary information for the overlapping tags (see Figure 8-18).

Select the Prev and Next links to move between the individual tag summary panels. To see detailed information on a specific tag, select the Details link while viewing the tag's summary information.


NoteSummary information for tags includes: Tag MAC address, Asset Name, Asset Group, Asset Category, Vendor (Type), Battery life and Last Located data (date and time). If the tag is Cisco CX v.1 compliant, telemetry information also appears.

Detailed information for tags includes this additional information: IP address of associated controller, statistics, location notifications, location history and whether the location debug feature is enabled.

To view location history for a tag, select that option from the Select a command drop-down menu and click GO.

To return to the details screen from the location history window, select the Tag Detail option and click GO.


Figure 8-18 Overlapping Tags Window


Monitoring Chokepoints

A chokepoint must be assigned to a map for its location to be monitored.

Refer to the "Adding Chokepoints to the Cisco WCS" section on page 7-13 of this configuration guide. After adding the TDOA receiver to a map, you must synchronize the network designs (Services > Synchronize Services) with the mobility services engine for it to appear on the map.

If a chokepoint is not assigned to a map, you are not able to find that chokepoint using Search or Advanced Search.

All chokepoint setup is done using the AeroScout System Manager.


Note Refer to the AeroScout Context-Aware Engine for Tags, for Cisco Mobility Services Engine Users Guide for configuration details at the following link: http://support.aeroscout.com.


To monitor chokepoints, follow these steps:


Step 1 Choose Monitor > Chokepoints. The Chokepoint summary window appears showing all mapped chokepoints.

Step 2 To refine the search criteria when an extensive list appears, search by MAC address or chokepoint name.

a. To initiate a search for a chokepoint by its MAC address or chokepoint name, enter that value in the Search field of the navigation bar. Click Search (see Figure 8-19).

Figure 8-19 Search for Chokepoint by MAC Address

Figure 8-19 shows a search by MAC address. Figure 8-20 shows the results.

If no match exists, a message appears in the results window.

Figure 8-20 MAC Address Search Results for a Chokepoint Indicating a Match

b. To initiate an advanced search for a chokepoint by its MAC address or name, click Advanced Search in the navigation bar.

1. Select Chokepoint as the search category.

2. Select either Chokepoint Name or MAC Address from the Search for Chokepoint by drop-down menu.

3. Enter either the chokepoint name or MAC address.

4. Click Search.

This example shows an advanced search using the chokepoint name (see Figure 8-21).

Figure 8-21 Chokepoint Name Advanced Search Panel

If no match exists, a message appears in the window (see Figure 8-22).

Otherwise the search result appears.

Figure 8-22 Chokepoint Advanced Search Results Indicating No Match


Monitoring Wi-Fi TDOA Receivers

A Wi-Fi TDOA receiver must be assigned to a map for its location to be monitored.

Refer to the "Adding Wi-Fi TDOA Receivers to Cisco WCS" section on page 7-19 of this configuration guide. After adding the TDOA receiver to a map, you must synchronize network designs (Services > Synchronize Services) with the mobility services engine for it to appear on the map.

If a TDOA receiver is not assigned to a map, you cannot find it using Search or Advanced Search.

All TDOA receiver setup is done using the AeroScout System Manager.


Note Refer to the AeroScout Context-Aware Engine for Tags, for Cisco Mobility Services Engine Users Guide for configuration details at the following link: http://support.aeroscout.com.


To monitor TDOA Receivers, follow these steps:


Step 1 Choose Monitor > WiFi TDOA Receivers. The WiFi TDOA Receivers summary window appears showing all mapped TDOA receivers.

Step 2 To refine the search criteria when an extensive list appears, search by MAC address or TDOA receiver name.

a. To initiate a search for a TDOA receiver by its MAC address or name, enter that value in the Search field of the navigation bar. Click Search (see Figure 8-23).

Figure 8-23 Monitor > WiFi TDOA Receivers Search Window

Figure 8-24 shows an example of advanced search using the TDOA Wi-Fi receiver name. Click View List to see a full list of Alarms.

If no match exists, a message appears in the results window.

Figure 8-24 Search Results Window

b. To initiate an advanced search for a TDOA receiver by its MAC address or name, click Advanced Search in the navigation bar.

1. Select WiFi TDOA Receiver as the search category.

2. Select either WiFi TDOA Receivers Name or MAC Address from the Search for WiFi TDOA Receiver by drop-down menu.

3. Enter either the TDOA receiver name or MAC address.

4. Click Search.

This example shows an advanced search using the MAC address (see Figure 8-25).

Figure 8-25 Advanced Search Panel

Figure 8-26 shows the search results.

If no match exists, a message appears in the results window.

Figure 8-26 WiFi TDOA Receivers Advanced Search Results Indicating a Match