TELECOM Digest OnLine - Sorted: Re: DSL Speed

Re: DSL Speed

John R. Levine (
18 Jun 2005 20:59:17 -0400

> I thought 56K was the fastest speed possible with conventional
> telephone cable. How can DSL be so much faster with the same old
> cable?

The 56K is the limit of a voice channel on a phone switch, not of a
copper cable. Rather than going through the phone switch, the DSL
signal is split out at the central office and feeds into a device
called a DSLAM which is sort of a super duper high speed modem that
can run several megabits/sec over a good enough copper pair.

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