IRIG 106-99   Figure 4-2.   PCM frame structure.


MINOR FRAME LENGTH “N” WORDS OR “B” BITS
MAX LENGTH
CLASS I - 8 192 BITS OR 1024 WORDS
CLASS II - 16 384 BITS


  1. BY DEFINITION A MAJOR FRAME CONTAINS N*Z WORDS OR B*Z BITS
    “Z” = THE NUMBER OF WORDS IN LONGEST SUBFRAME. (MAX. 256)
    “N” = THE NUMBER OF WORDS IN MINOR FRAME.
    “B” = THE NUMBER OF BITS IN MINOR FRAME.

  2. MINOR FRAME SYNC IS CONSIDERED ONE WORD, REGARDLESS OF LENGTH
  3. “W” IS WORD POSITION IN THE MINOR FRAME
  4. “S” IS WORD POSITION IN THE SUBFRAME


Figure 4-2.  PCM frame structure.