Provided in conjunction with either Feature Groups or Basic Serving Arrangements (BSAs). The use of a line side or trunk side switched access connection is dependent upon the switched access arrangement ordered by the customer.
Feature Group A (FGA) and Basic Serving Arrangement A (BSA-A) are defined as line side connections to the telephone company's network.
Feature Group B (FGB), Feature Group D (FGD), Basic Serving Arrangement Alternative B (BSA-B), and Basic Serving Arrangement Alternative D (BSA-D) are defined as trunk side connections to the telephone company's network.
Feature Groups and BSAs are arranged for either originating, terminating, or two-way calling, based on the end office switching capacity ordered. Terminating calling permits the delivery of calls from telephone company exchange service locations to the customer's premises. Originating calling permits the delivery of calls from the customer's premises to telephone company exchange service locations. Two-way calling permits the delivery of calls in both directions, but not simultaneously.