Identifies the standard code for the particular registered or non-registered jack used to terminate the service.
NOTE 1: Familiarization with the FCC's registration rules is requisite for all parties involved for the determination of the proper "Jack Code" for a given registered service. Registered jacks used to terminate Category 1 and 3 services begin with the designation "RJ".
USAGE: This field is conditional.
NOTE 1: Required when the JS (PRILOC) field is "E" or "N".
NOTE 2: Prohibited when the JS (PRILOC) field is not populated.
NOTE 3: Otherwise optional.
DATA CHARACTERISTICS: 5 alpha/numeric characters
EXAMPLE: R J 2 1 X