tion - Connects parties. Audible Ringing/Ringback - Signaling the called party by audible ringing, and the calling party by ringback. Call Termination - Disconnecting and terminating the call when a party hangs up.How does a switch accomplish all these functions? The answer is Software. The switch is a large scale, real time software based system. The switch itself, works through commands located in the software applications used. Software is the guiding command that makes the switch execute its processes. Now that the function and purpose of the telecommunications switch has been established, lets look in detail at the AT&T 5ESS digital switch. This switch is the leader in the market of Service Providing switches. It handles all forms of media transmission and is setup to be expanded very easily. With its flexible architecture it is easy to see why the AT&T 5ESS Switch serves over 70 million subscribers in more than 40 countries.AT&T 5ESSPicture of 5ESS - http://www.lucent.com/netsys/5ESS/familyThe first 5ESS Switch was installed in Sugar Grove, Illinois in March, 1982. It is a digital switch that provides local service, ISDN, Operator and International Gateway services, and a host of custom business and residential service offerings. The new digital switches replaced earlier electromechanical or analog switching systems. The 5ESS Switch is the most flexible digital exchange for use in the global switching network. The 5ESS equipment switches ISDN voice and data, local voice calls, long distance calls, Internet access, wireless PCS, Advanced Intelligent Network (AIN) services, interactive video and multimedia services.moving any media on the public switched network.The 5ESS Switch architecture is a modular, distributed architecture with an administrative module, a communications module, and a varying number of switching modules that provide the major processing power in the total communication system. Picture - http://www...
