An alarm gathering interface equipment has been developed to collect the hardware failure activities in 1$1, 024 imes1, 024$ ATM switching system. The equipment use 8-bit microprocessor and ELA-232C port, and is fabricated in a single board, which called Alarm Gathering Interface board Assembly(AGIA). It is programmed to ensure flexibility in modification and expansion of the system capability. The performance is successfully proved through communication test with hardware blocks or modules consisting a ATM switching system, these techniques can be used to develop operation and maintenance functions for more superior ATM switching system in the near future. we additionally have presented some items for further study on alarm subsystem often ATM switching system.