Background Signaling
As soon as a connection has been set up between the test set and a mobile, the
DUPLEX or RX mask can be called up at any time. Here it is then possible to
perform further typical mobile tests (eg the SAT loop test described at the
beginning of Chapter 10). The signaling is continued that is necessary to keep
the mobile connected. The fact that the signaling works in the background can
be seen from the lighting of the green LED of modulation generator GEN B.
[AUX]+
{DATA}
takes you back to the system program.
Striking the
[B/SAT]
key or calling up the basic TX mask will terminate background
signaling. You notice this from the fact that the LED extinguishes and the
message DATA-MODUL-Generator stopped appears in he status line on-
screen. The absence of signaling leads after a short time to termination of the
connection between the test set and the mobile.
IS-136 MS Background Signaling
10-46
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