Identifies the circuit or circuit segment against which the ports information is applied.
NOTE 1: The REF NUM entry on the PC Form must match the REF NUM entry for which the ports configuration is applicable.
NOTE 2: Once REF NUM is generated it cannot be changed and is retained through completion of the request.
NOTE 3: When a specific circuit or segment, identified by its REF NUM, has been canceled in the request provided by the customer, the corresponding REF NUM will not be included in any subsequent versions. The remaining circuit or segments will maintain their original association and not be renumbered.
VALID ENTRIES:
0001 - 9999
NOTE 1: An entry other than 0001 is only applicable when the Additional Ring Information (ARI) Form is used in conjunction with the request.
NOTE 2: When the REQTYP field on the ASR Form is “E”, “M”, or “S” an entry of 0001 in this field designates that the information provided on the PC Form is applicable to all of the requested circuits.
USAGE: This field is required.
DATA CHARACTERISTICS: 4 numeric characters
EXAMPLE: 0 0 2 3