Expla Nation Of Cha Nnel P Lans; Crea Ting A Ne W Chann El Pla N - Aeroflex 3900 Series Option Manual

Ex p l ana t i o n o f C h a n n e l P l ans
The Cha nnel P lan ma ps the uplin k (MS Tx) fr equency and t he d ownli nk (MS R x) f requ ency to a
Cha nnel Nu mb er. A Ch annel Pl an mu st b e l inked wit h a C hanne l N umber be cause TET RA sign aling
pro tocol uses C hannel Numb ers r athe r t han e xp licit freq uencies to assi gn TE TR A mob iles t o
fr equency chan nels. T heref ore, the mo bile and base stat ion ( or t he Test Set) map C hannel Numbe rs
must map to fre quencies in t he same manner . T ETR A mobiles and b ase sta tions co nfor ming t o th e
TIP ( TET RA Int erop erabi lity P rof ile) use t he st andar d C hannel Nu mberin g scheme define d in ETS I
TS 100 392-1 5. This C hann el N umber ing schem e is impl emented in 3 900 pr e-d efined Ch annel
Pla ns.
Cha nnel Number s map to f requ encies w ith a 25 kHz channel spacing, th eref ore the freq uencies are
inte ger mu ltiple s of 25 kH z, sub ject t o a possible fr equency o ffset . The C hann el P lan a lso def ines
how TE TR A cha nnel f requ encies a re l ocated (of fset) w ithin the fr equency b and:
I f t h e c h a n ne l b o u n d a r i e s a r e a t i n t e g e r m u l t i p l e s o f 2 5 k H z , t h e c e nt e r f r e q u e n c y i s o f f s e t
b y + 1 2 . 5 k H z f r o m t h e f r e q u e n c y i n d i c a t e d b y t h e C h a n n e l N u m b e r ( O f f s e t C h a n n e l P l a n ) .
I f t h e c ha n n e l c e n t e r f r e q u e n c i e s a r e a t m u l t i p l e s o f 2 5 k H z , t h e c e n t e r f r e q u e n c y h a s z e r o
o f f s e t f r o m t h e f r e q u e n c y i n d i c a t e d b y t h e C h a n n e l N u m b e r ( Z e r o O f f s e t C h a n n e l P l a n ) .
The 3900 su pport s bot h opt ions, as w ell a s the less common 6.25 kHz offse ts.

Crea ting a Ne w Chann el Pla n

The para me ters describ ed be low are automa tically configu red when one of t he 3 900's st andar d
pre define d C hannel Plan s is sele cted. If th e mobile does not confor m to one o f t he pr e-de fined
Cha nnel Plans, a new C hannel Pla n w ith the deta ils of the C hannel Pla n used by t he mo bile mu st be
config ured.
Ther e ar e t wo aspects to t he C hanne l Pl an conf igur ation:
S y s t e m I n f o r m a t i o n ( S y s I n f o ) p a r a m e t e r s a r e u s e d t o s u p p l y i n f o r m at i o n i n t h e T e s t S e t ' s
c o n t r o l c h a n n e l s i g n al t o t e l l t h e m o b i l e a b o u t t h e C h a n n e l P l a n .
C h a n n e l B l o c k p a r a m e t e r s t e ll t h e T e s t S e t h o w t o m a p C h a n n e l N u m b e r s t o f r e q u e nc i e s .
When usin g o ne of the p re- define d C hann el Plan s, the Test S et conf igur es a ll necessar y pa ramet ers.
When a new C hann el P lan is creat ed, the Sys I nfo p aramet ers and t he C hanne l Bl ock par ameter s
must b e setu p in a manne r t hat the mo bile u nder test under stands. T he T est S et intent ionall y does
not creat e any links be tw een t he t wo sets of par ameter s, w hich allow s fu ll fl exibilit y in d efinin g a
customized system; however this mea ns tha t manu a lly conf igur ed pa ramete rs must be set cor rect ly.
C o m m o n T E T R A O p e r a t i o n
F i g . 2 - 6 T E T R A C h a n n e l P l a n M e n u
2-6