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Over the last few decades, there have been very few dynamic changes to the telecommunications networks of the world. Telephones were once connected by an operator who used a hardwire cable to connect one telephone wire to another, bridging the connection between subscribers. As years went by, these switchboards became larger in size, with many more connections to be made as the subscriber base grew. The telephone switch was invented as a method of connecting these telephone wires without human intervention, but the method for making those connections really was no different than the switchboard concept. The difference was that the connection was being made through electromechanical relays instead of an operator. The basic concept of making a connection did not change. The bridge was being made electromechanically; the concept of bridging two wires together to form an end-to-end circuit had not changed. As years went by, this principle remained the same, albeit the networks became more complex and sophisticated through multiple layers of switches and facilities. The proper term for this type of routing is point-to-point circuit switching. When a telephone call is being made, a connection is made using a hardwired connection (or series of connections) until a complete circuit is made from origination to destination. When digital switching was implemented, this principle still did not change. The only difference was that digital electronics were being used in place of electromechanical relays to make the connections. Since digital switches used computers, additional intelligence could be exchanged between the end points using a separate signaling data network. Packet networks, on the other hand, do not rely on fixed circuits to deliver their payload. The packet network uses a series of connection points to form a network consisting of many different routes. This allows data to be routed through any available connection until it reaches its destination without the need to establish a fixed connection end to end. This is certainly a more efficient means of networking, but when used for voice and other real-time applications (such as video), it presents some challenges. The biggest
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challenge is to ensure that there is no delay in the delivery of the packets carrying digitized voice, and to ensure that the packets are delivered in the proper sequence. Imagine if you be would having a conversation with a family member, through a packet network that is unable to provide this level of quality of service. Your voice packets are routed through various routes, some of them taking longer to reach the final destination (your phone) than others. The end result is scrambled audio that becomes undecipherable. This is not to mention how delayed packets (latency) causes an undesirable effect similar to satellite connections where the two-way conversation becomes difficult (you begin talking, but suddenly you hear the other party talking). You see this effect on television today when newscasters are broadcasting remotely using IP-based services over the Internet, with no QoS implemented. There is a delay between the local newscaster and the remote newscaster, the video is choppy, and the audio is not in synch with the newscaster s lip movements (the audio and video packets are out of synch). This has prevented telecommunications networks from evolving to packet networks capable of delivering all forms of communications, until the last several years. This chapter describes the architectural changes and challenges that have led to the biggest changes in telecommunications history: Voice over IP (VoIP).
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The Traditional Voice Network
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Traditional voice networks use dedicated circuits for connecting end to end for any one call. These circuits remain dedicated through the duration of the call but then remain idle until the next call. This, of course, is a highly inefficient means of utilizing facilities, as they are not being used 100 percent of the time. Over the years much work has been done to improve trunk utilization; however, the real problem with the entire model is the switching concept that has been in place since the first telephone was connected. As I ve already described, the basic model of circuit switching worked well in the early days of telephony but has long outlasted its usefulness. Packet networks introduce more efficiency, but packet switching also has its issues when dealing with real-time payloads such as video and voice. Packets must be delivered without delay, and in sequence. Packet networks were not designed with real-time applications in mind and therefore were never well suited for voice. This has all changed now with new protocols developed for session control over packet networks, and the VoIP network engineered specifically for voice and video. But there are still concerns that need to be addressed beyond QoS. It helps first to understand the legacy architectures and why they have remained so reliable and secure when designing a VoIP network.
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