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To: ahhaha who wrote (688)	11/21/1997 1:36:00 PM
From: Altec	Respond to of 29970

You stated it far more eloquently, but the physics are very simple: . The phone cos are struggling to get 1.5 Mbps service to any reasonable distance with DSL (current commercial state of the art is 12,000 ft; less than 50% of homes & businesses are in this reach'); plenty of copper plant upgrades are required to even make this happen . Hybrid-fiber-coax delivers up to 30 Mbps over a single 6 Mhz channel; most cable systems are 550-750 Mhz (80-110 channels or so + overhead) Cable has an absolutely massive bandwidth advantage over phone cos. This is already of advantage for @Home today, but as the world moves to even more bandwidth intensive applications, the advantage will become more and more apparent. DSL is a bandaid on inferior infrastructure in comparison. ATHM wins.

To: ahhaha who wrote (688)	11/21/1997 1:38:00 PM
From: ftth	Read Replies (1) \| Respond to of 29970

Ahhaha: you made the comment <<It may be possible to manipulate the carrier wave into some exotic form that gets around copper's limitations sufficient to achieve say 10 mbps so that current cable is a difference that doesn't make a difference (so fast everything seems instantaneous), but no one knows how to do that yet.>> Actually, it is do-able currently. T1.413 (ADSL/DMT) has provisions for 16 MBPS on short loops. Longer reach at lower rates is conceivably scalable to multiplexed feeds also. At what cost? That's a different story. Existing infrastructure? That's a different story also. Also, I disagree that high-QoS requires FTTH. QoS issues are well defined for HFC (fiber from headend to node; coax from neignborhood node to the home). Ingress noise is unquestionably an issue, but it is well characterized and tested for. The FEC in the developing or ratified specs is extremely robust. It is a far more difficult problem in the upstream direction. Also, ghosting and laser clipping are part of the standard test suite, so their effects are bounded. Same goes for microreflections. dh