This INTEGER (genericAis, msAis, or aisL, default Generic-AIS) selects which specific SONET/SDH Alarm Indication Signal variant an STM-64 (10 Gb/s SDH) client port 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 STM-64 tells downstream SDH equipment specifically that the alarm applies at the multiplex-section layer rather than sending the more generic default AIS pattern.