Identifies the number of light rays transmitted over an optical fiber core diameter measured in microns.
VALID ENTRIES:
A = Single mode
B = Multi mode with 50 micron core diameter
C = Multi mode with 62.5 micron core diameter
USAGE: This field is conditional.
NOTE 1: Prohibited when the corresponding PTYP field is “AB”, “AC”, “AE”, “AF” or “BR”, otherwise optional.
DATA CHARACTERISTICS: 1 alpha character
EXAMPLE: A