Patent ID: 7209552
Filing Date: 2007-04-24
Classification: H04M

Abstract:
1. A telecommunication terminal device for use with a public telephone network to transmit and receive telecommunication signals and is capable of connecting external terminal devices of different connection types with the public telephone network, the telecommunications terminal device comprising: a network connection unit having at least a first pin and a second pin to which the public telephone network is connected, and a third pin and a fourth pin through which a first external terminal device of a first connection type interface is connected to the first and the second pins according to a first switching unit; the first switching unit to selectively connect the first external terminal device and a second external terminal device of a second connection type interface other than the first connection type interface with the public telephone network; a first external terminal connection unit having at least a fifth pin and a sixth pin through which the second external terminal device is connected to the first and the second pins according to the first switching unit; and a feeding circuit connected to the first and the second pins to keep a current provided from the public telephone network flowing; wherein the first switching unit selectively establishes a parallel connection between the public telephone network and one of the first and second external terminal devices, and selectively establishes a serial connection between the public telephone network and the other one of the first and second external terminal devices.