Fixed subscriber unit of wireless local loop system

Abstract

An off-hook/on-hook signal discriminating means 5a is provided in a control portion 5 of the FSU in order to make discrimination between a pulse dial signal and a hooking signal. When a telephone turns to an off-hook state after an on-hook state and turns to an on-hook state again and the on-hook state is continued for a predetermined time, the FSU performs a terminating process so as to be returned into a standby state. When an off-hook signal is detected again in a time smaller than a predetermined time, the FSU recognizes that the signal is either a dial pulse signal or a hooking signal, and the off-hook/on-hook signal discriminating means 5a monitors the time required for detecting an on-hook signal again. When the time required for detecting an on-hook signal again is smaller than the predetermined time, the FSU decides that the signal is a dial pulse signal, and controls a tone generating circuit 7f to stop the dial tone. When there is no on-hook signal detected even though the predetermined time is passed, the FSU decides that the signal is a hooking signal, and controls the tone generating circuit 7f to stop the dial tone. Because a pulse dial signal and a hooking signal are discriminated from each other, dialing and hooking can be used differently in the same operation as an ordinary telephone connected to a wire telephone line.