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To: DaveMG who wrote (18648)	11/20/1998 3:56:00 PM
From: w molloy	Read Replies (2) \| Respond to of 152472

More on data... Hello Dave I was assuming with a higher data rate it takes less time to transmit a given amount of data and hence, "capacity" increase. As usual, no free lunch. Your assumption is correct, but ... - The higher rate will come at the expense of some other service (i.e voice). Like you say, no free lunch. - The network providers currently view voice services as sacrosanct, so ... - Most Data services are packetised, so time per se is no longer an issue. The sender breaks the data stream into packets and sends them out. The sender doesn't care how long it takes (within reason), just as long as the packets arrive. Will voice quality increase in higher bandwidth/faster data rate systems due to decreased latency? No - voice quality these days is a function of the encoding technology employed. For example, in the old days, a voice channel was digitised (i.e encoded using PCM) to 64kbps. This is a little high , so a new encoding scheme called ADPCM was developed, reducing the rate to 32kbps. Modern encoding schemes (RELP et al) reduce the bit rate even further, to 13.3kbps for 'high' quality voice, and 8.5 kbps for 'low' quality voice. The gist here is that the network providers want to squeeze as much traffic (i.e revenue) as possible out of the available bandwidth. Hence they look to minimise the bit-rate on a voice channel therefore maximising the number of channel possible. Today, network providers get their revenue from voice. Data services will reduce the voice traffic capacity, so may reduce the network providers revenue. Because of this risk, there will be quite a bit of inertia regarding the introduction of data services. This is what bogged CDPD down (and has essentially killed it off). And isn't IXRTT (did I get that right) going to increase capacity and data rates within the same bandwidth? I'm afraid I don't know what IXRTT is. I've addressed encoding schemes in my previous segment. regards w.