-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 01/04/2011 04:04 PM, Michael Sokolov wrote: > Charles N Wyble <char...@knownelement.com> wrote: >
> > It depends on how you define a CLEC. I don't know (or care really) how > the telco lawyers define it, but to me a true CLEC is someone who has > put up their own physical gear in a CO cage or in the outside plant. Correct. I understand that. You are referring to a facilities based CLEC. > > DSLExtreme is not that: they don't have their own DSLAMs anywhere, they > just have an interconnection agreement with ATT (and probably VZ too) > that gives them access to ILEC's regular ADSL DSLAMs at the ATM PVC > level. I call this a front-end. Hmmmm. That's news to me. I'm having trouble seeing if DSLExtreme is a facilites based CLEC or just a reseller. You could be right. > >> Speakeasy is a CLEC (though I think they got bought by BestBuy as >> I recall. Kind of a weird purchase.). > > Speakeasy was also a front-end like DSLExtreme, not a DSLAM back-end > operator, and they are now part of MegaPath too. Hmmm. Didn't know that. > >> Well SDSL/T1 are viable options. > > Aha, it's interesting to hear this from someone other than me. Would > you care to elaborate? Just when would you consider SDSL/T1 to be a > good choice? Even more specifically, when would you consider SDSL/T1 to > be a better choice than ADSL/U-Verse/FiOS/cable? Up until now everyone's > been saying in one voice that the latter are superior by every metric. A few reasons: 1) A t1 is the only way to do BGP with a carrier, outside a data center/private peering agreement. 2) SDSL is a way to ensure some diversity in the local loop (cable plant damage non withstanding of course). I wouldn't run SDSL as a primary solution, until such time that I can get competitive speed as ADSL. It sounds like this is possible with pair bonding. I might now consider switching. I do plan to have an SDSL loop as an out of band access method. > >> SDSL being more so due to the lower cost, > > Heh. Covad/MP salesmen would much rather sell you T1 than SDSL, but > that's because they are most likely commission-based. Just ignore them > and insist on SDSL if you want something that's just like a T1, but a > little cheaper. Right. I noticed that exact definition on ATT site: http://www.att.com/gen/general?pid=7306 HDSL High Bit-rate Digital Subscriber Line (HDSL) technology is generally used as a substitute for T1/E1. Symmetric Digital Subscriber Line (SDSL) technology is a 2-wire implementation of HDSL. so there you go. > > If one does an apples-to-apples comparison between 1.5 Mbps SDSL and a > T1, the main disadvantage of SDSL is that thanks to the dismantling of > all Copper Mountain DSLAM networks, you get ATM cells on your line. My > OSDCU or the Paradyne iMarc box will convert this SDSL/ATM to HDLC on > your side, but you still have to live with less efficient use of that > 1.5 Mbps bit pipe. OTOH, if you get a T1, they do the ATM to HDLC > conversion in the DSLAM for you, so the 1.5 Mbps bit pipe carries the > more bit-efficient HDLC. Hmmmm. ATM overhead is interesting. http://pflog.net/dsl_overhead/ is the best I can find right now. I saw another article which went into far more detail, but I can't locate it right now. I think it was on ioshints. > >> and the substantial effort put into your SDSL CPE. > > > They call it "Ethernet" because "Ethernet" sells better than "SDSL". > They provide an MLPPP router (sourced from my competitor Adtran) and > just tell their users: "plug into this Ethernet jack right here and > don't worry about anything else", that's how they call it "Ethernet". I see. > > If someone wanted to get this bonded SDSL service *without* the Adtran > box, it would require escalation and getting me in on a 3-way call with > your MegaPath account rep. Or just put the Adtran box in the driveway > and drive over it with a truck, then get an open source replacement from > Harhan. LOL. > > For extra credit, make a home video of the Adtran box being run over by > your truck, upload it to YouTube *over the connection served by the > Harhan replacement*, and send a link to your MP account rep. Can also > Cc a few executives whose E-mail addresses I can provide. ROFL. Nice. > > >> Got it. Something like >> http://www.business.att.com/content/product/images/dsl_Copy.gif > > That picture is quite accurate indeed. But for maximum accuracy, in > the yellow-colored CLEC part replace "DSLAM" with "LCS", and replace > "ATM Switch" with "MCS". The Nokia D50 DSLAM is actually a distributed > two-stage architecture, and I suspect that Covad has put only the LCS > part of it in every CO. One MCS can manage up to 12 LCS boxes, and I > wouldn't be surprised if Covad manages with a single MCS per 12 CO > sites. Right. I recall that now. - -- Charles N Wyble (char...@knownelement.com) Systems craftsman for the stars http://www.knownelement.com Mobile: 626 539 4344 Office: 310 929 8793 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBAgAGBQJNI7sbAAoJEMvvG/TyLEAtIOgP/Ap8sL76yxHLpZUi80OGekbY G3R30g+V9DhbLG3Mjll771HlzgrVsypGcb2D6m+Mx6h689YW4nqzSjhpIWRJJ0h8 0VVZCx03YVUBe1ilpMREFjfOUn5oMqZCMblq5w9RwG4FyZaoIQWgxp+zhnH368dg Plvg6MrI75Oro+Mer10YrS/fRAEN4BPm5Frai+Wnx+6gzehFvj8NrgnDLWSsNK3n zdXdSgzKnzJMzR3tp+qv+tdPidpbUTvf8n5KAnujTbLvhTaIrSrXCBeKhh08OzJn d3Vjsl9g2GdL8AXHoN5IYNaa3KrTzvb6JGvX3IzNu03KmqoGETOAKEOlzk57b8pX HlNhAhJhfc2xlodbz0GwZgjYT+LuPDoe/w9xpymtmZpdH/bnSr2DsDkaAxyc/ZQi pOo2XzdoqklCwn4+U00bXGmJWFcA0jT+GGNgxHyCBWnmV9WVOEkXcjCUwwhxX8Iq pnFs3YL2PfU6b9/m/iJqUO9rSwLKIhXACjgraaodyvk3yPozD7hiUccTbMj8r8Ib VeS4/AGNHD69R2bWvvZSEhROYxq/BgojKNsTyvBlSTn51ejdueoc2QSj9Hp3QjuA +ewMXMlvwU93FIhMv2P2J3kg3EaFp7uVY7LoI6pDVV6Hd1uk3aCFEPA8otKUb6J3 7rhqMnbGMgf+CMVk7ZvG =UsUV -----END PGP SIGNATURE----- _______________________________________________ LinuxUsers mailing list LinuxUsers@socallinux.org http://socallinux.org/cgi-bin/mailman/listinfo/linuxusers
