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Voice compression and why we need it?Voice compression is becoming increasingly popular and with good reason. It saves enormous amounts of money and in some cases allows for communications that would not otherwise be possible. Voice compression offers many advantages. Virtually every type of WAN connectivity benefits from Voice compression. Different manufacturers use different methods for voice compression. There are several things that voice compression algorithms have in common. In each instance they digitize the voice. Most voice compression devices then remove "dead air" (periods when there is silence) and a series of flags indicate repeated tones which can be generated at the other end. This is an over simplification but you get the idea. The net result of this voice compression is that essentially the same audible sounds are transmitted within less bandwidth. Voice compression in use on a TDM network allows significantly more calls per timeslot. For example, by using the sophisticated voice compression algorithm of the Vmux-2100, a voice channel can be compressed from 64 kbps to as little as 4 kbps This means that a single international E1 can carry the equivalent of 16 E1s of voice traffic. Today IP networks are carrying an increased amount of voice traffic. Voice compression reduces the amount of bandwidth required for the voice traffic allowing more data over the same link. Voice Compression is used in situations where the amount of bandwidth available is limited. A good example is a satellite link where bandwidth is at a premium if it is available at all. With a satellite or radio link you might have a single 64 kbps channel over which you need to transmit two voice channels and 2 RS232 data channels. This could be accomplished using a Kilomux 2100 with the appropriate voice and data cards. Without voice compression this link would only carry 1 voice channel. Cellular applications can also benefit from voice compression. Once again the available bandwidth is limited. Voice compression is here to stay and Cutter Networks will be here to help fulfill your needs. |
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