Download e-book for iPad: Softswitch: Architecture for VoIP by Frank Ohrtman

By Frank Ohrtman

ISBN-10: 0071409777

ISBN-13: 9780071409773

Bypassing the previous circuit-switched undefined, softswitches streamline message site visitors and supply a way more effective carrier improvement surroundings. besides SIP, this expertise leverages web applied sciences to switch plain-old-telephone carrier. builders who're freed up via softswitch expertise to construct reasonably priced 3G serives will find out how it really works and what functions it could help. community managers making tough judgements approximately even if to installation VoIP will examine professionals and cons, charges and merits, and most significantly the right way to separate delusion from truth.

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ATM switch 1 determines this signal is destined for ATM switch 4 for a digital television. In this case, the communication path is through ATM switches 1, 2, and 4. Optical Transmission Systems At the physical layer, carriers use microwave or fiber optic cable to transport ATM packets containing voice and data from switch to switch. IXC backbone carrier facilities primarily use microwave and fiber transmission lines. Microwave systems offer a medium capacity of up to several hundred Mbps communications with a range of 20 to 30 miles between towers.

It transmits the features of Class 5. With almost three decades of development, the Class 4 switch has a well-established history of interoperability with the features offered by the Class 5 and SS7 networks. Features often enable service provider systems to generate high margins that, of course, equate to stronger revenue streams. Examples of features offered through the DMS-250 system can be grouped into two major categories: basic and enhanced services. The basic services include 1ϩ, 800/900 service, travel cards, account codes, PIN numbers, operator access, speed dialing, hotline service, automatic number identification (ANI) screening, virtual private networks (VPNs), calling cards, and call detail recording.

Another mechanism to enhance reliability is to ensure no single point of failure (SPOF) exists on the system. That is, every mechanism has a backup in the event of the failure of one unit. Hot standby refers to having a replicated unit take over the functions of its primary unit for either planned or unplanned outages. 13 Network Equipment Building Standards (NEBS) In addition to the five 9s, the other buzzword for reliability in the Class 4 market is Network Equipment Building Standards (NEBS).

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Softswitch: Architecture for VoIP by Frank Ohrtman

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