FRN,Data Item,Data Item Description,Length in Octets,System Units
1,I048/010 ,Data Source Identifier ,2,N.A. 
2,I048/140 ,Time-of-Day ,3,1/128 s 
3,I048/020 ,Target Report Descriptor ,1+ ,N.A. 
4,I048/040 ,Measured Position in Slant Polar Coordinates ,4,RHO: 1/256 NM THETA: 360°/(216) 
5,I048/070 ,Mode-3/A Code in Octal Representation ,2,N.A. 
6,I048/090 ,Flight Level in Binary Representation ,2,1/4 FL 
7,I048/130 ,Radar Plot Characteristics ,1+1+ ,N.A. 
FX ,n.a. ,Field Extension Indicator ,n.a. ,
8,I048/220 ,Aircraft Address ,3,N.A. 
9,I048/240 ,Aircraft Identification ,6,N.A. 
10,I048/250 ,Mode S MB Data ,1+8*n ,N.A. 
11,I048/161 ,Track Number ,2,N.A. 
12,I048/042 ,Calculated Position in Cartesian Coordinates ,4,"X, Y: 1/128 NM "
13,I048/200 ,Calculated Track Velocity in Polar Representation ,4,Speed: (2-14) NM/s Heading:360°/(216) 
14,I048/170 ,Track Status ,1+ ,N.A. 
FX ,n.a. ,Field Extension Indicator ,n.a. ,
15,I048/210 ,Track Quality ,4,N.A. 
16,I048/030 ,Warning/Error Conditions/Target Classification ,1+ ,N.A. 
17,I048/080 ,Mode-3/A Code Confidence Indicator ,2,N.A. 
18,I048/100 ,Mode-C Code and Confidence Indicator ,4,N.A. 
19,I048/110 ,Height Measured by 3D Radar ,2,25 ft 
20,I048/120 ,Radial Doppler Speed ,1+ ,N.A. 
21,I048/230 ,Communications / ACAS Capability and Flight Status ,2,N.A. 
FX ,n.a. ,Field Extension Indicator ,n.a. ,
22,I048/260 ,ACAS Resolution Advisory Report ,7,N.A. 
23,I048/055 ,Mode-1 Code in Octal Representation ,1,N.A. 
24,I048/050 ,Mode-2 Code in Octal Representation ,2,N.A. 
25,I048/065 ,Mode-1 Code Confidence Indicator ,1,N.A. 
26,I048/060 ,Mode-2 Code Confidence Indicator ,2,N.A. 
27,SP-Data Item ,Special Purpose Field ,1+1+ ,?
28,RE-Data Item ,Reserved Expansion Field ,1+1+ ,?
FX ,n.a. ,Field Extension Indicator ,n.a. ,