Re: Video on demand --- info requested

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3 total messages Started by Jonathan Rosenberg Sat, 07 Nov 1992 20:15

#733

Author: Jonathan Rosenberg
Date: Sat, 07 Nov 1992 20:15

24 lines
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From: jonathan@rahul.net (Jonathan Heiliger)
Subject: Re: Video on demand --- info requested
Date: Sat, 7 Nov 1992 17:30:04 GMT

	In article <1992Nov5.141630.10937@walter.bellcore.com> 
	jxr@thumper.bellcore.com (Jonathan Rosenberg) writes:

	best you can attain on those right now is about 14.4 kb/s, with a
	modem).  But there is a technology that is beginning to move out of the
	lab that can support T1 rates (1.544 Mb/s) to most residences over the
	existing copper plant.  This technology is known as ADSL (Asymmetric

> Actually a T1 line still runs over normal copper wire.  True, you usually 
> need a hub & a hub adaptor for it; however it's still a normal phone wire.  

The key to ADSL is "to most residences over the existing copper plant". 
It is my understanding that while T1 uses a "normal phone wire"
(actually a wire pair), it is not suitable for use over the vast
majority of wire pairs running to residences.  To get T1 somewhere
normally requires pulling new wires.  To get ADSL to most places just
requires a new network terminator in the residence (as well as some
stuff at the CO end, of course).  Big difference.

JR

Re: Video on demand --- info requested

#761

Author: Steve Warwick
Date: Tue, 10 Nov 1992 19:17

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Note:

ADSL is single-direction 1.5 mbps only, with (maybe) 64kbps upstream.

Another technology, called HDSL requires two pairs, but gives
bi-directional 1.5 mbps in standard wires.

steven

Re: Video on demand --- info requested

#765

Author: Terry Smith
Date: Wed, 11 Nov 1992 15:41

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I missed some of this thread.  Did it already come out that ADSL
requires an "unloaded" pair?  If the run from the phone central office
is less than 18,000 feet, it is about 70% likely to be "non-loaded".
If the run is greater than that, there is loading somewhere.

Very interesting to think about what I don't know about things!

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