Yuri, If you have fiber between the CPE and the "DSLAM", then you do not need DSL... You just deliver FTTH (Fiber to the Home). If you have fiber for only part of the way, then you deploy a mini-DSLAM (which is what is being done in many places), and then use the fiber for upstream connectivity for the the mini-DSLAM.
Arie -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Yuri Bank Sent: Friday, December 11, 2009 14:46 To: Yuri Bank; [email protected] Subject: Re: [c-nsp] DSL signals vs DOCSIS I understand that they use different frequency ranges, but why can't the DSL freqencies be converted and sent over fiber somewhere between the CPE and the DSLAM ? On Thu, Dec 10, 2009 at 11:41 PM, Dmitry Kiselev <[email protected]> wrote: > Hello! > > On Thu, Dec 10, 2009 at 08:48:27PM -0800, Yuri Bank wrote: > > > Why can't DSL signals pass through fiber optics, yet we have HFC networks > > that obviously have no issues going from copper to fiber. > > The modulation techniques DOCSIS and DSL use are similar, so what > prevents > > this from working with DSL? Is it that the RF is to weak and the > conversion > > process messes up the signal? > > It is becouse very different frequency ranges: > DSL 0.02-1.1 MHz for both up and downstreams > DOCSIS 16-30 MHz for upstream > 50-800 MHz for downstream > > -- > Dmitry Kiselev > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
