公开(公告)号：US20030086559A1

公开(公告)日：2003-05-08

申请号：US09986333

申请日：2001-11-08

Applicant: ASKEY COMPUTER CORP.

Inventor： Su-Yi Chen ,  Benson Chen

IPC: H04M001/00 ,  H04M009/00

CPC classification number: H04M3/12 ,  H04M1/2535 ,  H04M1/82 ,  H04M7/0057

Abstract: The invention herein is fallback function communications device comprised of a microprocessor, utilized to perform a predetermined operation and processing of a predetermined input signal and then output a corresponding signal, as well as a minimum of one relay circuit having an amplifier circuit and a relay. The terminal at the first side of the relay is connected to the telephone line tip/ring terminal, while the terminal at the second side of the relay is connected to the Public Services Telephone Network (PSTN) tip/ring terminal of the microprocessor. An off-hook detection circuit is connected to the PSTN tip/ring terminal and also connected to the ring detection terminal of the said microprocessor. A dummy load circuit is connected to the tip terminal and the ring terminal of the PSTN. As such, in the event of Voice Over Internet Protocol (VOIP) system failure, the present invention is capable of automatically switching to the PSTN and thereby maintain telephone system operation.

Abstract translation: 本发明是由微处理器构成的回退功能通信装置，用于执行预定的操作和处理预定的输入信号，然后输出对应的信号，以及至少一个具有放大器电路和继电器的继电器电路。 继电器第一侧的端子连接到电话线尖端/环形端子，而继电器第二侧的端子连接到微处理器的公共电话网络（PSTN）尖端/环形端子。 挂机检测电路连接到PSTN耳机/环形终端，并且还连接到所述微处理器的振铃检测终端。 虚拟负载电路连接到PSTN的终端和环形终端。 因此，在因特网协议语音（VOIP）系统故障的情况下，本发明能够自动切换到PSTN，从而维持电话系统的运行。