Line circuit for key telephone system
阅读：766发布：2023-07-27
专利汇可以提供Line circuit for key telephone system专利检索，专利查询，专利分析的服务。并且A line circuit for interfacing subscriber sets of a key telephone system with a telephone line terminating at its other end in a central office or a private branch exchange. The line circuit embodies a novel approach in this particular field, utilizing logic building blocks to condition two control means performing functions associated with such systems. The approach is well suited to MIS components and technologies.，下面是Line circuit for key telephone system专利的具体信息内容。
1. A line circuit for controlling the connection of a subscriber set in a key telephone system to a telephone line, comprising: first and second control means each having first and second operating positions to provide four operating configurations; and a binary logic means responsive to an idle condition of said telephone line and said subscriber set for conditioning said first and second control means in a first operating configuration to indicate said idle condition; said binary logic means also being responsive to an incoming ringing signal, containing a succession of ringing bursts and ringing pauses, on said telephone line for conditioning said first and second control means in a second operating configuration to indicate an incoming ringing signal condition; said binary logic means including a discriminator network for delayedly responding to said incoming ringing signals, and a multi-function time-out circuit for maintaining said ringing condition during said ringing pauses; said binary logic means also being responsive to an off-hook condition of said subscriber set for conditioning said first and second control means in a third operating configuration to indicate a busy condition of said telephone line; and said binary logic means also being responsive to initiation of a hold signal from said subscriber set to condition said first and second control means in a fourth operating configuration to indicate a hold condition of said telephone line.
1. A line circuit for controlling the connection of a subscriber set in a key telephone system to a telephone line, comprising: first and second control means each having first and second operating positions to provide four operating configurations; and a binary logic means responsive to an idle condition of said telephone line and said subscriber set for conditioning said first and second control means in a first operating configuration to indicate said idle condition; said binary logic means also being responsive to an incoming ringing signal, containing a succession of ringing bursts and ringing pauses, on said telephone line for conditioning said first and second control means in a second operating configuration to indicate an incoming ringing signal condition; said binary logic means including a discriminator network for delayedly responding to said incoming ringing signals, and a multi-function time-out circuit for maintaining said ringing condition during said ringing pauses; said binary logic means also being responsive to an off-hook condition of said subscriber set for conditioning said first and second control means in a third operating configuration to indicate a busy condition of said telephone line; and said binary logic means also being responsive to initiation of a hold signal from said subscriber set to condition said first and second control means in a fourth operating configuration to indicate a hold condition of said telephone line.
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