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S U B
N O . O F
F I E L D
F I E L D
B I T S
MU
VSB
4
MV
56
ARA
14
MTE
1
RAC
4
RAT
1
VDS
8
VDS1
4
VDS2
4
NC
4
ND
4
O PERATI ON MANUAL
TCAS- 201-2
B I T S
F O R M A T S
P O S I T I O N
U P D O W N
61-64
X
33-88
X
41-54
X
60
X
55-58
X
59
X
33-40
X
33-36
X
37-40
X
5-8
X
5-8
X
O ve r vi 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 ( co n t )
C O N T E N T
E n co d e d S e n se B i t s f o r V e r t i ca l R e so l u t i o n
C o m p l e m e n t s p r o vi d e a p a r i t y co d i n g f i e l d
t o p r o t e ct f o u r ve r t i ca l se n se b i t s ( C V C a n d
V R C ) i n a l l T C A S R e so l u t i o n M e ssa g e s. I f
b i t s 4 3 - 4 6 d o n o t a g r e e w i t h b i t s 6 1 - 6 4 , t h e
T C A S r e ce i ve r a ssu m e s a n e r r o r a n d
d i sr e g a r d s m e ssa g e . B i t s a r e a s f o l l o w s:
4 3
4 4
4 5
4 6
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
F i e l d , p a r t o f t h e l o n g a i r - a i r su r ve i l l a n ce
r e p l y D F = 1 6 , co n t a i n s i n f o r m a t i o n u se d i n
a i r - t o - a i r e xch a n g e s ( C o o r d i n a t i o n R e p l y
M e ssa g e ) .
S a m e a s i n M B f i e l d .
S a m e a s i n M B f i e l d .
S a m e a s i n M B f i e l d .
S a m e a s i n M B f i e l d .
D e f i n e s t h e co n t e n t o f t h e M V m e ssa g e f i e l d
a n d i s e xp r e sse d i n t w o 4 - b i t g r o u p s, V D S 1
( 3 3 - 3 6 ) a n d V D S 2 ( 3 7 - 4 0 ) .
I s se t t o 3 f o r C o o r d i n a t i o n R e p l y M e ssa g e .
I s se t t o 0 f o r C o o r d i n a t i o n R e p l y M e ssa g e .
P r o vi d e s t h e se g m e n t n u m b e r t r a n sm i t t e d i n
a n u p l i n k E L M a n d i s p a r t o f a C o m m - C
i n t e r r o g a t i o n , U F = 2 4 .
P r o vi d e s t h e se g m e n t n u m b e r t r a n sm i t t e d i n
a d o w n l i n k E L M a n d i s p a r t o f a C o m m - D
r e p l y, D F = 2 4 .
6 1
6 2
6 3
6 4
0
0
0
0
1
1
1
0
0
1
1
1
1
0
0
1
1
0
1
1
0
1
0
1
1
1
0
0
0
0
1
0
1
1
0
1
0
0
1
1
1
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
0
0
0
1
1
1
1
1
A P P E N D I X B
P a g e 1 1
S e p 1 / 0 4
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