综合业务数字网络IntegratedServicesDigitalNetwork.ppt

?2006,ShenzhenPolytechnic.Allrightsreserved.*?2006,ShenzhenPolytechnic.Allrightsreserved.*?2006,ShenzhenPolytechnic.Allrightsreserved.*?2006,ShenzhenPolytechnic.Allrightsreserved.*?2006,ShenzhenPolytechnic.Allrightsreserved.*BRIissometimeswrittenas2B+D.Thisinterfaceprovidestwobearerchannelsat64kbpsandanadditional16-kbpssignalingchannel.TheBchannelscanbeusedfordigitizedspeechtransmissionorforrelativelyhigh-speeddatatransport.NarrowbandISDNiscircuit-switchingoriented.TheBchannelistheelementalcircuitswitchingunit.TheDchannelcarriessignalinginformation(callsetup)tocontrolcallsonBchannelsattheUser-NetworkInterface(UNI).Inadditiontocarryingsignalinginformation,theDchannelisusedtocarrysubscriberlow-ratepacketdata,suchasalarmsystems.Ciscoroutersdonotcurrentlyusethisfacility.TrafficovertheDchannelemploystheLAPDdata-link-levelprotocol.LAPDisbasedonHDLC.ThecallsetupfollowstheITU-TQ.931recommendationforcallcontrolstandards.综合业务数字网络

IntegratedServicesDigitalNetwork深圳职业技术学院计算机系网络专业01ISDN概述（ISDNOverview）02ISDN组成（ISDNComponents）03ISDN参考点（ISDNreferencepoints）04ISDN用途（UsesforISDN）05ISDN基本配置（ISDNConfigurationTasks）06DDR配置（ConfiguringDDR）教学目标（Objectives）logo什么是ISDN？（WhatisISDN?）ISDN优势（BenefitsofISDN）ISDNcancarryavarietyofusertrafficsignals,(data,voice,video)1.ISDN可以携带各种用户的信息ISDNoffersmuchfastercallsetupthanmodemconnections.2.ISDN建立呼叫所占用的时间比拨号上网要快得多ISDNprovidesafasterdatatransferratethanmodems3.提供比调制解调器更快的数据传输速率基本ISDN组成（BasicISDNComponents）基本ISDN组成（BasicISDNComponents）组成描述终端设备类型1（TE1）指与ISDN网络兼容的设备，它连接NT1或NT2终端设备类型2（TE2）指与ISDN网络不兼容的设备，它连接到ISDN网络需要TA终端适配器（TA）把非ISDN设备的电信号转换成ISDN使用的标准格式，以便使其能够连接到ISDN网络网络终端类型1（NT1）连接4线的ISDN用户线和传统的2线本地环路网络终端类型2（NT2）连接用户设备和NT1设备ISDN参考点（ISDNReferencePoints）ISDN参考点（ISDNReference