xdsl2PMLSinceLinkUas 1.3.6.1.4.1.890.1.5.12.43.60.4.1.1.1.5

Count of seconds in Unavailability State since last line up. Unavailability begins at the onset of 10 contiguous severely-errored seconds, and ends at the onset of 10 contiguous seconds with no severely-errored seconds.