This INTEGER (genericAis, msAis, or aisL, default Generic-AIS) selects which specific SONET/SDH Alarm Indication Signal variant a 10G WAN PHY client port framed as SONET inserts downstream when it needs to signal a fault condition. An administrator selects the AIS type to match what downstream equipment expects to interpret correctly, since different AIS variants are recognized at different layers such as multiplex section versus line. For example, selecting msAis on 10G WAN SONET tells downstream SDH equipment specifically that the alarm applies at the multiplex-section layer rather than sending the more generic default AIS pattern.