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枫下家园 / 家用电器 / 谁研究过双线电话机？看了一下公司的电话，没看懂，line-1,line-2都公用一个插头,到底是这个插头上连四根线呢，还是有一个小交换机？
自从有了voip以后，两线电话都嫌少了.
-biosfix(hydronican);
2007-3-16
(#3557167@0)
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只有一个cable，两根线
-maple88(㊣枫叶);
2007-3-16
(#3557175@0)
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两根线，是什么意思？２wires or 2 phone-lines?
-biosfix(hydronican);
2007-3-16
(#3557260@0)
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就是不明白，是两根线起作用，还是四根线走两个线路？
-biosfix(hydronican);
2007-3-16
(#3557270@0)
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每根电话线其实都是两根线，TIP & RING
-maple88(㊣枫叶);
2007-3-16
(#3557430@0)
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还是没明白，电话机物理上接了几根wire? 怎样实现的双线切换？thanks
-biosfix(hydronican);
2007-3-16
(#3557458@0)
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One phone line requires 2 physical wires. Nowadays, lots new phone cables have 4 wires which mean they can carry 2 phone lines (1 using the middle 2 and 1 using the outside 2) and just need one 插头Ordinary telephone set we usually use can only accept 1 phone line (generally using the middle 2 wires of the cable). Some newer phones can accept 2 phone lines and need 4 wires get into it.
-barbarian(粗人);
2007-3-17
{191}
(#3558602@0)
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This confirmed my guess, clearlly. Thanks. (㊣枫叶) not clear enough. :-))
-biosfix(hydronican);
2007-3-17
(#3558935@0)
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包子好吃不在摺上,,,,,,两根不嫌少
-remember_me_not(r-m-n);
2007-3-16
(#3557193@0)
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那个插头是可以接四根线的,
-johnnyzh(bubble);
2007-3-16
(#3557782@0)
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一个插头四根线， 里面两根接线路1， 外面两个接线路2
-sane0898(浪迹ROLIA,一年又一年);
2007-3-17
(#3559149@0)
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这里都用数字话机,两线最多可接四路语言信号.判断方法是电压低,反接不响的就是数字.
-hardy_hs(hardy);
2007-3-22
(#3570768@0)
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这里都？really? 两线四路怎么接话机？并上四个，还是需要类似hub的东西？用在哪里？我就见过两线差分电路（tip/ring）和四线（也是差分的）电路（tip/ring/tip-return/ring-return）。
-remember_me_not(r-m-n);
2007-3-22
(#3570813@0)
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*话机上一般都有十二到十六个键,全是自定义键,转移,选线,等待,抓专用线,会议,跟随,留言,......
-hardy_hs(hardy);
2007-3-22
(#3570819@0)
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要看你的电话机是系统的还是家用的,两种接法不同.
-phorepr(tec);
2007-3-26
(#3578560@0)
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http://www.lanshack.com/wire_phone_jack.aspx
-coala(考拉);
2007-3-27
(#3578727@0)