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Chapter 4 39
Screens
Fast BER Screen
Fast BER Screen
One extra field, labelled Loopback, appears in the Fast Bit Error screen,
when the HP/Agilent 8922 is in 2x1 mode.
Figure 4-3 Fast BER screen
The Loopback field is a toggle field and allows the choice of either master
or slave. This instructs the mobile to either loopback the master channel
on the downlink to the master uplink or loopback the slave downlink to
the master uplink.
Note that toggling the Loopback field does not immediately instruct the
mobile to perform a loopback using the contents. Entering the screen
sends the command to the mobile to close the loop. It is therefore
necessary to enter the screen with this field set to loopback the downlink
channel of choice.
NOTE When performing Fast BER on the slave channel, it is necessary to start
the measurement on the master unit because the master unit controls all
the signalling with the mobile). As a result, this also starts a Fast BER
measurement on the master unit which should be ignored.