Viavi 3900 Series Operation Manual page 282

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St ar t S of t K ey
Pr es sin g the S ta rt S of t K ey se nd s a s ing le To n e fo r t he sp e cifie d len gt h o f tim e
(D ur atio n ). Wh en th e S ta rt S o ft K e y is pr es se d the T on e E n co din g A F o r M o du la tion
G en er ato r o cc up ie s A F G en er ato r 1 o r M od G e ne ra tor 1 o n the G e ne ra tor s T ile. Whe n
th is oc cu rs, th e T on e Ty pe se lec ted on th e T on e E nc od in g Tile o v er- ride s th e Wav e sh ap e
se lec te d o n AF G e ne ra tor 1 o r M o d G en era to r 1 fo r th e d u rat ion o f th e to n e s eq u en ce .
7. 5. 9. G
2 To n e S eq ue nti al (M od Gen )
Tw o T on e S e qu en tia l s ign alin g allo w s t he us er to co nf igu re the 3 90 0 to ge ne ra te t wo
to ne s at a sp ec ified fre qu en cy for a de fine d le n gth of tim e . To ne A is th e fi rst to ne , To n e
B is t he se co nd to n e. T h e a bi lity t o d e fine d iffe ren t to n es allo w s t he us e r to de te rm ine if
th e U U T is p ro pe rly pr oc es sin g t he re ce ive d au dio to ne s eq ue nc e .
7. 5. 9. G .1
Fi el d / So ft Key Defi ni ti o ns
FM Mo d ul atio n
Th e FM M o d ula tio n fie ld de fin es th e d e via tio n v alu e for To n e A a nd T on e B.
To n e A /B F re qu e nc y
Th e fre qu en cy fie ld de fin es th e T on e A an d To ne B F req ue n cy for th e G e n Mo d ula tio n
Fr eq ue nc y.
To n e A /B D u ra tio n
Th e Du ra tio n f ield d efin es th e len gt h o f tim e T on e A a n d T o ne B ar e e m itte d.
St ar t S of t K ey
Pr es sin g the S tar t S oft Ke y b e gin s s en di ng the s ele cte d ton e se qu en ce a s d efi ne d b y t he
se lec te d fo rm a t. Wh en th e S ta rt S o ft K ey is p re ss ed th e T on e En co d ing A F o r M o du lat ion
G en er ato r o cc up ie s A F G en er ato r 1 o r M od G e ne ra tor 1 o n the G e ne ra tor s T ile. Whe n
th is oc cu rs, th e T on e Ty pe se lec ted on th e T on e E nc od in g Tile o v er- ride s th e Wav e sh ap e
se lec te d o n AF G e ne ra tor 1 o r M o d G en era to r 1 fo r th e d u rat ion o f th e to n e s eq u en ce .
A n al og D up le x S y st em
Fig . 7 -6 1 Tw o To n e S e qu en tia l - M o du la tion
7 - 72

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