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O P E R A T I O N M A N U A L
A T C - 6 0 1
APPEN D I X B
P a g e 4
J u n 1 / 9 7
F I E L D
S U B
F I E L D
N O . O F
B I T S
B I T S
P O S I T I O N
F O R M A T S
U P D O W N
C O N T E N T
A A
2 4
9 - 3 2
X
T h e a i r c r a f t a d d r e s s a n n o u n c e d i n t h e c l e a r ,
u s e d i n D F = 1 1 , 1 7 .
A C
1 3
2 0 - 3 2
X
T h e a l t i t u d e c o d e u s e d i n f o r m a t s D F = 0 , 4 ,
1 6 a n d 2 0 . A l l b i t s a r e Z e r o s i f a l t i t u d e
i n f o r m a t i o n i s n o t a v a i l a b l e . C o n t a i n s
m e t r i c a l t i t u d e i f M - b i t ( 2 6 ) i s O n e .
A P
2 4
2 4
3 3 - 5 6
8 9 - 1 1 2
X
X
P a r i t y o v e r l a i d o n t h e A d d r e s s a p p e a r s a t
t h e e n d o f a l l t r a n s m i s s i o n s , u p l i n k a n d
d o w n l i n k , w i t h t h e e x c e p t i o n o f f o r m a t
D F = 1 1 .
A Q
1
1 4
X
D e s i g n a t e s f o r m a t s U F = 0 , 1 6 a s a c q u i s i t i o n
t r a n s m i s s i o n s . B i t 1 4 ( R I , D F = 0 , 1 6 ) ,
r e p e a t s A Q a s r e c e i v e d b y t r a n s p o n d e r .
B D
8
1 5 - 2 2
X
C o n t a i n s t h e i d e n t i t y o f t h e g r o u n d - i n i t i a t e d
C o m m - B r e g i s t e r c o n t e n t s t o a p p e a r i n t h e
M V f i e l d o f t h e c o r r e s p o n d i n g r e p l y , u s e d i n
U F = 0 .
C A
3
6 -8
X
U s e d i n D F = 1 1 , S q u i t t e r o r A l l C a l l r e p l y , t o
r e p o r t t r a n s p o n d e r c a p a b i l i t y . C o d e s a r e :
0 = L e v e l 1 , n o c o m m u n i c a t i o n s c a p a b i l i t y
( s u r v e i l l a n c e o n l y , ) T r a n s p o n d e r a c c e p t s
U F = 0 , 4 , 5 , 1 1 ; T r a n s p o n d e r t r a n s m i t s
D F = 0 , 4 , 5 , 1 1 .
1 = L e v e l 2 , C o m m - A a n d C o m m - B
c a p a b i l i t y , T r a n s p o n d e r a c c e p t s U F = 0 ,
4 , 5 , 1 1 , 2 0 , 2 1 ; T r a n s p o n d e r t r a n s m i t s
D F = 0 , 4 , 5 , 1 1 , 2 0 , 2 1 .
2 = L e v e l 3 , C o m m - A , C o m m - B a n d u p l i n k
E L M c a p a b i l i t y , T r a n s p o n d e r a c c e p t s
U F = 0 , 4 , 5 , 1 1 , 2 0 , 2 1 , 2 4 ; T r a n s p o n d e r
t r a n s m i t s D F = 0 , 4 , 5 , 1 1 , 2 0 , 2 1 .
3 = L e v e l 4 , C o m m - A , C o m m - B , u p l i n k a n d
d o w n l i n k E L M c a p a b i l i t y , T r a n s p o n d e r
a c c e p t s U F = 0 , 4 , 5 , 1 1 , 2 0 , 2 1 , 2 4 ;
T r a n s p o n d e r t r a n s m i t s D F = 0 , 4 , 5 , 1 1 ,
2 0 , 2 1 , 2 4 .
4 = L e v e l 2 , 3 o r 4 ; a b i l i t y t o s e t c o d e 7 , a n d
i s o n t h e g r o u n d .
5 = L e v e l 2 , 3 o r 4 ; a b i l i t y t o s e t c o d e 7 , a n d
i s a i r b o r n e .
6 = L e v e l 2 , 3 o r 4 ; a b i l i t y t o s e t c o d e 7 .
7 = D R
≠
0 o r F S = 3 , 4 o r 5 .
N O T E : C o d e s 4 - 7 a r e f o r s q u i t t e r s o n l y .
CC
1
7
X
I n d i c a t e s t r a n s p o n d e r h a s a b i l i t y t o s u p p o r t
c r o s s l i n k c a p a b i l i t y ( d e c o d e t h e c o n t e n t s o f
t h e U F = 0 B D f i e l d a n d r e s p o n d w i t h t h e
c o n t e n t s o f t h e s p e c i f i e d g r o u n d - i n i t i a t e d
C o m m - B r e g i s t e r i n t h e M V f i e l d o f t h e
c o r r e s p o n d i n g D F = 1 6 r e p l y . U s e d i n D F = 0 .
O ve r v i e w o f F o r m a t D e f i n i t i o n s
T a b l e 3
Summary of Contents for ATC-601-2
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