User's Manual Part 1

Nomad User’s Manual Chapter 4 – Specifying Nomad Settings

 Check Enable automatic time synchronization to prevent time drift in synchronization

between the test laptop and the Voice or Call Server. This option requires that you have

access to the time synchronization source (internet or GPS) during testing.

 Set the period between time synchronization updates in minutes. Spirent recommends

setting this to 5 minutes for frequent updates. Note that time synchronization during

testing has no impact on data collection or performance.

4.2.2 GPS Settings

Nomad can record GPS information during testing. Location information may be used to display

data testing results graphically in MapInfo

and similar mapping applications (see Section 8.4).

GPS may also be used as the Time Synchronization method as described in Section 4.2.1. To capture

GPS information with Nomad:

 Connect the GPS device and enable the device to acquire a signal.

 In the GPS area of the GPS/Time dialog, confirm that the Enable GPS box is selected.

 If desired, enable the Audible alarm on failure of the GPS.

 Select the GPS Type as Garmin or Serial NMEA0183 (for DeLorme or any device that

supports this standard). For a serial device, select the corresponding COM Port.

If available, live GPS data will be displayed here:

 The current latitude and longitude are displayed.

 The GPS FIX status is given by the colored circle in this area. Hover over the circle for the

status tooltip. The status is provided as NO FIX, 2-D DIFF, 3-D or 3-D DIFF. DIFF status

refers to a lock on differential GPS sensors, providing a slightly more accurate location

reading than standard GPS.

 The blinking heart indicates that Nomad is receiving messages from the GPS. The

heart blinks each time a GPS message is received.

 The yellow triangle indicates that an error has occurred. Click the Restart GPS

button to activate (in some cases it may be necessary to click this button twice).