This object indicates which ring speed detect circuit(s) caused the fault, if there was one. The return code indicates the location on the board feeding the speed detect circuit(s). Ring in means the circuit on the back-up path between the ring out port and the ring in port. FNB means the circuit between the ring in port and the FNB. NotApplicable means that a ring Speed Fault has not occurred. Since more than one circuit can cause the fault, the return code is the sum of the following values: 1 - FNB 2 - RingIn 4 - RingOut 8 - NotApplicable