TELECOMMUNICATION SYSTEM

What is provided is a telecommunication system including: a master unit (MU); a plurality of sub units (SU); and a timer, wherein the plurality of sub units (SU) transmit to the master unit (MU), an operation result of a predetermined operation; a transmission of the operation result to the master unit (MU) from at least one of the plurality of sub units (SU) is monitored by an other sub unit (SU) among the plurality of sub units (SU); when the transmission of the operation result is not observed for a predetermined period of time, the other sub unit (SU) transmits to the master unit (MU) based on the timer, an operation result obtained by the predetermined operation.