E&M IS A telephone signaling protocol that uses separate wires for signaling and voice. There are several variations of E&M signaling. A common use of E&M signaling is to connect voice mail and 2-way systems to other switches and devices.
时间: 2005-11-11 17:27
作者: legend8179
E&M is a type of signaling traditionally used in the telecomunications industry.
Indicates the use of a handset that corresponds to the ear (receiving) and
mouth (transmitting) component of a telephone
时间: 2005-11-11 17:30
作者: legend8179
Analog trunk circuits connect automated systems, such as a private branch exchange (PBX) and the network such as a central office (CO). The most common form of analog trunking is the E&M interface. E&M Signaling is commonly referred to as "ear & mouth" or "recEive and transMit", but its origin comes from the term earth and magnet. Earth represents electrical ground and magnet represents the electromagnet used to generate tone.
E&M signaling defines a trunk circuit side and a signaling unit side for each connection similar to the data circuit-terminating equipment (DCE) and data terminal equipment (DTE) reference type. Usually the PBX is the trunk circuit side and the Telco, CO, channel-bank, or Cisco voice enabled platform is the signaling unit side.
时间: 2005-11-23 10:15
作者: chenyu1980
受益非浅，顶。
时间: 2005-11-24 13:32
作者: legend8179
路由器上的FXS口模拟的是PBX的一个分机端口的功能
时间: 2007-4-2 16:26
作者: seribus
<p><a href="http://www.txrjy.com/dispbbs.asp?boardID=15&RootID=109438&ID=109438">http://www.txrjy.com/dispbbs.asp?boardID=15&RootID=109438&ID=109438</a></p><p>We are seeking a senior HW engineer who can design FXS and FXO interface.</p>