20:10:29:35Apportionment of plant-nonspecific operations

expenses in accounts 6510 and 6530. Plant-nonspecific operations expenses in accounts 6510 and 6530 are apportioned among the interexchange category, the billing and collection category, the special access category, and switched access elements in the same proportions as the combined investment in central office equipment, information origination/termination equipment, and cable and wire facilities are apportioned to each element and category.

Source: 19 SDR 111, effective January 31, 1993.