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8 Switching Fabric Implementation
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Now that we have explored the concepts of call processing and media processing, we can begin exploring the layer of the telephony resource framework that holds everything else together This chapter deals with all of the concepts, terminology, and technology involved in switching fabric implementations Switching is at the core of the functionality provided by telephone systems The telephony switching fabric carries out switching operations that involve conveying media stream data by allocating and deallocating media stream channels between telephone network endpoints, and collecting and communicating signaling information This chapter begins by explaining telephone switching concepts and terminology, implementation considerations, and design options The balance of the chapter provides a complete review of each phase of telephony switching fabric innovation including analog circuits, digital transmission, voice over packet-based networks such as IP, and wireless telephony technologies that are used in telephone network switching fabric implementations
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81 Switching Resources
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A switching fabric implementation consists of a telephony switching network layered over one or more transmission networks The transmission networks each provide one or more transmission facilities which are used by the telephony switching network implementation to establish media stream channels and signaling paths to individual devices and to external telephone networks
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Figure 8-1 Switching resources
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The telephony switching network also includes mechanisms for media stream interconnection which allow the media stream received on one media stream channel to be transmitted, or switched, on to another media stream channel The switching fabric is managed by a switching control function that is responsible for carrying out switching operations and conveying signaling information to the call processing implementation
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811 Switching Control Function
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The switching control function operates the telephony switching network The responsibilities of the switching control function include: Managing availability of transmission facilities and internal resources used to provide interconnections; Allocating and deallocating media stream channels; Interconnecting media stream channels associated with each transmission facility; Interconnecting media stream channels for multi-point calls; and Conveying signaling information to and from call processing While all modern switching control function implementations are software-based, early telephone system implementations were completely unautomated so people live operators performed the control function In the first generation of automated telephone systems the control function was mechanical and its logic was hardwired into the equipment The switching control function in private telephone systems is typically located at a single central point in the switching network known as the switch This type of switching control function is the basis for a centralized telephony switching network This type of switching network is simple, robust, and efficient Some telephone system implementations support a distributed telephony switching network (see section 836 for more information on distributed switching) In these implementations, a single centralized switching control function is typically used to control all the distributed switching network components Some implementations are decentralized so there is no central coordination or management of the switching network In a decentralized telephony switching network all decision making is decentralized and each instance of the switching control function within the switching fabric in question is a peer to all of the others and can operate independently One benefit is that a part of the network can fail without affecting the rest
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In any switching fabric implementation where multiple switching control function components are interconnected by various transmission facilities, each switching control function must use signaling to communicate with the others in order to coordinate the allocation of capacity on the interconnecting circuits so as to minimize the overall consumption of media stream channels Conventional enterprise telephone systems use proprietary switching fabric control protocols However, the public network uses a well-defined standard protocol known as Signaling System 7, or SS7 In open VoIP implementations (see section 86), MGCP or MEGACO may be used to implement a distributed switching fabric and the H323 or SIP protocols may be used between peer switching control functions These open protocols allow system customers to buy and integrate switching fabric equipment from different vendors
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