FXS和FXO详解.doc

Understanding Foreign Exchange Office (FXO) Voice Interface Cards Introduction The Cisco Foreign Exchange Office (FXO) interface is an RJ-11 connector that allows an analog connection to be directed at the public switched telephone networks (PSTNs) central office or to a station interface on a private branch exchange (PBX). The FXO sits on the switch end of the connection. It plugs directly into the line side of the switch so the switch thinks the FXO interface is a telephone. Note:?The FXO Voice Interface Card (VIC) is not the same as a Foreign Exchange Station (FXS) card and therefore does not provide dial tone. Do not plug a telephone set to the FXO VIC. Understanding Foreign Exchange Station (FXS) Voice Interface Cards Introduction A Foreign Exchange Station (FXS) interface connects directly to a standard telephone, fax machine, or similar device and supplies ring, voltage, and dial tone. The Cisco FXS interface is an RJ-11 connector that allows connections to basic telephone service equipment, keysets, and private branch exchanges (PBXes). For more information and troubleshooting, refer to the HYPERLINK /tacpage/support/tac/tsa/launch_tsa.html%20 TAC Case Collection ( HYPERLINK /RPF/register/register.do registered customers only) tool. HYPERLINK /blog/410629 FXS与FXO详解 关键字: fxs, fxo FXS和FXO是模拟电话线(也叫做POTS—普通老式电话业务)使用的端口的名称 FXS—外围交换用户话机接口是将模拟线路传输到话机的埠。换句话说，就是传送拨号音，电池电流以及响铃电压。 FXO——外围交换局接口是接受模拟线路的埠。它是电话或传真机，或模拟电话系统上的插口，用来传输挂机/摘机指示(回线闭合)。由于FXO端口附着于装置上，如传真机或电话机，所以这种装置通常被称为“FXO装置”。 FXO和FXS总是相辅相成的，类似插头和插座的关系。 如果没有企业通信交换机，电话将直接连接到由电话公司提供的FXS端口上。 无PBX系统下的FXS?/?FXO 如果您有一台企业通信交换机，那么您可以将电话公司提供的线路连接到企业通信交换机上，然后再将电话连接到企业通信交换机上。由此可见，企业通信交换机必须同时具备FXO端口(连接由电话公司提供的FXS端口)和FXS端口(连接电话机或传真机)。 PBX下的FXS?/?FXO ? FXS??FXO??VOIP 通过网络购买将模拟电话线连入VOIP网络电话系统，或将传统企业通信交换机连接到IP网络服务提供商的设备时，必定会遇到FXS和FXO这两个专业术语。 FXO网关 为了将模拟电话线连接到IP?PBX上，你需要一个FXO网关。FXO网关能使你将FXS埠连接到网关的FXO埠上，这样便能将模拟电话线转化成VOIP网络呼叫。 FXS网关 FXS网关用于将一条或多条传统企业通信交换机的线路连接到VOIP网络电话系统或供应商上。你需要一个FXS网关，因为你希望将FXO端口(一般连接到电话公司)连接到网际网络或V