A DSLAM is using Reed-Solomon forward error correction on a DMT DSL line. The DSL service is using TCP/IP over ATM over DSL. A high number of upstream RS uncorrected errors are occurring on the DSL line, as reported by the DSLAM in the following status message:DSL Statistics:Init Events: 2Transmitted Superframes: near end: 93681573 far end: 0Received Superframes:
near end: 93516422 far end: 0Corrected Superframes: near end: 142631 far end: 31571Uncorrected Superframes: near end: 191 far end: 1LOS Events: near end: 0 far end: 0LOF/RFI Events: near end: 0 far end: 0ES Events: near end: 5 far end: 1What is the result of the uncorrected errors?
A.
The DSL frames will be continuously retransmitted by the DSL transceivers until an error-free frame is received.
B.
If errors on the DSL line can not be corrected by the RS algorithm, the line will be automatically taken out of service.
C.
The errored data resulting from uncorrected layer-1 errors will be handled by TCP.
D.
When Reed-Solomon forward error correction is used, all errors are corrected at layer 1. The uncorrected state was present only until forward error correction algorithms corrected the errors.