This read-write attribute sets the alarm severity generated when the errored-seconds threshold is crossed on the ComPort, defaulting to Minor. Errored seconds are a standard telecom line-quality metric, so this setting controls how seriously the platform treats a STU whose per-second error rate crosses the configured limit. For example, an admin monitoring a subscriber with a history of marginal line quality might raise stuAlmSevEsThres so that errored-second events get flagged well before service noticeably degrades.