



— UJ 



il 



_i 



Ul 



z 

 z 

 < 



X 



DATA 

 FRAMES 



^1 



_i 



UJ 



z 

 z 

 <t 



X 



DATA 

 FRAMES 



•*- 



_i 



u 



z 

 z 

 < 



X 



7TH 



LEVEL 



o 



D 



D 



D 



D 



D 





D 



u 



6TH 



LEVEL 



1 



@ 



@ 



1 



@ 





§ 



1 



5TH 



LEVEL 



D 



□ 



D 



D 



D 





D 



D 



4TH 



LEVEL 



n 



D 



D 



D 



D 





D 



D 



3R0 



LEVEL 



D 



D 



D 



D 



D 





D 



D 



2ND 



LEVEL 



D 



D 



D 



D 



D 





D 



D 



1ST 



LEVEL 



D 



D 



D 



D 



D 





D 



D 



DATA 

 FRAMES 



D D PARITY INFORMATION 



IDENTIFICATION LEVEL 



D n D " 



D D 



□ D I DATA LEVELS 



TAPE MOTION 



Figure 4. Magnetic Tape Format. 



D D 

 D D J 



7TH LEVEL Q D 



DID 



6TH LEVEL 



5TH LEVEL ■■■■■DDDDD 

 4TH LEVEL D D □ □ □ □ ^ ^ ^ ^ 

 3RD LEVEL D D D ■ ■ □ □ ^ " " 



■ DiDilQiD" 



2ND LEVEL 



1ST LEVEL I 

 BCD CHARACTER ABCDEJ KLMN 



Figure 5. BCD Coding for Ciiannel Identification. 



