EE 284 Lecture Notes - Lecture 2: Circuit Switching, Frame Relay, Environmental Noise
Document Summary
Carrier-grade means high capacity, the capability to support hundreds of thousands, perhaps millions, of subscribers and similar numbers of simultaneous calls. Voip is simply the transport of voice traffic using the internet protocol (ip), hardly a surprising definition. However, it is important to note that voip does not automatically imply voice over the internet. Here the ip is used because although it is less reliable but its fast as compared to the tcp. In case of voice transmission, every millisecond of data is not necessary. For the traditional telephony circuit switching is used, but now for voip. Ip is an attractive choice for voice transport for several reasons. Circuit-switccircuit-switched telephone networks transport voice at a rate of. Typical human speech has a maximum fre- quency of somewhat less than 4,000 hz. hed telephone networks transport voice at a rate of 64 kbps.
