SONET Thresholds Use the SONET Thresholds tab to provision the SONET thresholds. For a list of ONS nodes and cards that support this subtab, see Provisioning. Thresholds do not appear until a circuit is created. To view and/or edit the thresholds, choose one of the following links: • SONET Thresholds (DS-1 and DS-3 Cards) • SONET Thresholds (Line, Section, and Path for OC-N, MRC-N, and EC1 Cards)