DSL help plz.

Rick Moen rick at linuxmafia.com
Tue Dec 28 13:58:35 PST 1999

Quoting ME (dugan at libwais.sonoma.edu):

> Ys this is likely to e the case. A T1 is likely to outperform SDSL when
> uploads and downloads both approach 1.544Mbps. In today's environments,
> SDSL works ok for may people running a mostly DL service while a full T1
> works better to tie together two LANs which are both likely to exchang
> traffic simultaniously.

I doubt you have this right.  The "S" stands for "symmetric".

> Another form of xDSL called (I think) HDSL is supposed to be better than a
> T1 in that it can allocate up to 8 or 9 Mbps aggregate pipe-size which can
> be dynamically converted to emphasize uploads, downloads, or be equal both
> ways.

Yes, I've recently administered a LAN that included a 2 Mbps HDSL
segment across my (former) employer's office building, on the available
CAT3 telco cabling.  (One of the advantages of HDSL is that it can
survive such cabling.)

> Even if it is not true "full duplex", 8 to 9 Mbps is fast enough to
> simulate a pipe aster than a T1.

However, I wasn't _speaking_ of 8 - 9 Mbps:  At my building, housing The
CoffeeNet, my hosts, Richard Couture's, and several of our clients', we
went directly from T1 service to 1.1 Mbps SDSL, and our connectivity has
continued to have all the characteristics of full-duplex.

> SDSL and HDSL frequently cost more than ADSL.

As well they should, given the pipe sizes usually involved.

Cheers,                            "I'd say it's latke-esque.  Sort of like 
Rick Moen                           Kafka-esque, only less depressing."      
rick (at) linuxmafia.com                             -- Deirdre Saoirse

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