Date: Mon, 07 Aug 2000 12:57:51 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Martin Recktenwald <mreckt@cs.uni-sb.de> Cc: freebsd-isdn@FreeBSD.ORG Subject: Re: ADSL Message-ID: <5171.965645871@critter.freebsd.dk> In-Reply-To: Your message of "Mon, 07 Aug 2000 12:51:51 %2B0200." <20000807125151.A3901@vodix.cs.uni-sb.de>
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In message <20000807125151.A3901@vodix.cs.uni-sb.de>, Martin Recktenwald writes : >On Mon, Aug 07, 2000 at 12:38:40PM +0200, Poul-Henning Kamp wrote: >> In message <20000807123134.A3807@vodix.cs.uni-sb.de>, Martin Recktenwald writes >> : >> >> Well it does in that sense that 'IDSL' uses ISDN technology to carry ADSL >> over short distances, but slower. >> >I did a quick websearch for IDSL; sounds quite useless to me. And has >the wrong name. ADSL is a layer 1 technology. ISDN also defines layer 1. >Something like "ADSL over ISDN" doesn't seem to make sense. > >And it doesn't provide any serious advantage over plain ISDN. Well, if you belong to the crowd who belives that "pay-per-view" and your POTS will be delivered in ATM cells in the future it does. Otherwise it's just a way to get a 144kbit/sec Internet connection without blocking a path in your switch. >This is the first time I heard about IDSL, so I might just be plain wrong. >It sounds like an always-on ISDN connection using both B channels and >the D channel. It isn't. It's ATM cells packed up using the same electrical parameters as an ISDN is packed up (2B+D == 144kbit/sec) >> There is no benefit from a ISA/PCI ADSL card, unless you want to run >> ATM services in addition to IP. > >It could be cheaper? In the case of ISDN, a router costs real money, >an ISDN card can be bought for 50 EUR. Maybe this is not (yet) true >for ADSL. It will not be cheaper. All ADSL/IDSL suppliers I have heard about gives you a "CPE" with ethernet as part of the package. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD coreteam member | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message
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