Viavi 3900 Series Operation Manual page 259

Radio test set
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7. 5. 3. D. 9
DT MF Key pa d E n try S o ft K ey
Se le ctin g the D T M F K e yp ad E ntr y S o ft K ey s a llo w s th e us er to ge ne ra te DT M F ton e s
us ing the Te st S et's Da ta E n try K ey pa d a nd a ss ig ne d so ft ke ys . DT M F Wa ve fo rm m u st b e
se lec te d f or the e na ble d Au di o o r M o du la tion G e ne rat or to s im u late A F an d M o d DT M F
op er ati on .
Whe n us ing th e A F o r M o d D T M F A , B , C an d D S o ft K ey s, th e T e st S e t is o pe ra tin g in an
As si gn ed fu nc tio n a nd th e Re tu rn So ft K e y m u st be p res se d to r es um e T es t M o de
O pe ra tion .
7. 5. 3. D. 10
Retu rn S oft Ke y
R etu rn s to th e top le ve l so ft ke y fu n ctio ns fo r th e RF G e ne ra tor s T ile.
A n al og D up le x S y st em
Fi g. 7 -3 8 DT M F K ey pa d En try S oft Ke y Su b- m en us
7 - 49

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