Identifies the PON of a related Access Service Request.
NOTE 1: The RPON specified in this field identifies the PON which is establishing the physical connection (UNI) for this end of the EVC.
USAGE: This field is conditional.
NOTE 1: Required when the associated UREF field is populated and the associated RUID and the associated AUNT fields are not populated.
NOTE 2: Prohibited when the associated AUNT field is populated.
NOTE 3: Otherwise optional.
DATA CHARACTERISTICS: 16 alpha/numeric characters
EXAMPLE: 8 2 4 Z 9