3.9 External GPS Receiver
It is possible to connect an external GPS receiver (part No. G0325A) available
from Anritsu. The GPS receiver is used for:
Precise time synchronization, when making one way Frame Transfer
Delay measurements as part of the Ethernet Service Activation Test.
Clock source in an IEEE 1588v2 system
Timing source for synchronizing Ethernet transmitters
Reference source for Ethernet bit rate measurements
Connect The 15 pin D-sub connector to the 15 pin AUX connector on the
connector panel.
Activating the GPS receiver
The GPS receiver is activated automatically if it has connected to Network
Master.
Using the GPS service
One purpose of the external GPS receiver is to provide for precise one way
Frame Transfer Delay measurements as part of the Ethernet Service
Activation Test.
When the GPS receiver is activated and the active interface is Ethernet, the
Network Master will calibrate its internal time base to the ultra precise time
signal from the GPS receiver. The calibration process takes approximately 1
minute. After calibration, if the GPS receiver is disconnected (or the GPS
signals are lost), the GPS system enters "Holdover" mode. In Holdover mode,
ms accuracy of the Frame Transfer Delay measurement can be maintained
for approximately 1 hour.
When Ethernet is not the active interface, Holdover mode is not applicable.
For best accuracy, let the Network Master warm up for 5 - 10 minutes before
removing the GPS receiver, and keep the surrounding temperature as constant
as possible.
GPS Icon
An icon in the status bar will indicate the current GPS status. One of the
following icons will be shown:
The GPS is receiving signal from a sufficient number of
satellites.
GPS receiver is not connected.
Touching the icon will display an information pop-up dialog box.
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