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A lineman's handset is a special type of telephone used by technicians for installing and testing local loop telephone lines. It is also called a test set, butt set, or buttinski. ==Components== A typical lineman's handset integrates an earpiece, a mouthpiece, a dialing interface, and a set of test leads for connecting to the telephone circuit. Originally, lineman's handsets featured a rotary dial, but modern sets use some variant of the standard 12-button DTMF keypad. Most handsets are designed to be used with analog "POTS" lines, and have limited or no function with digital circuits. In addition to the basic features listed above, handsets often include one or more of: * Speakerphone * Redial * A talk/monitor toggle switch * Mute * Hook flash button * Tone/pulse dialing selection switch * Low-pass filtering to prevent disruption of data communications (such as DSL) * A mechanical hook for hanging the set from a tool belt. On some sets, it may be moved to the receiver side, mouthpiece side, or removed altogether. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lineman's handset」の詳細全文を読む スポンサード リンク
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