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Groups > comp.os.linux.misc > #87371

Re: Redundancy/Survival

From TheLastSysop <thelastsysop@dev.null>
Newsgroups comp.os.linux.misc
Subject Re: Redundancy/Survival
Date 2026-06-02 16:03 +0000
Organization The Null Device Restoration Society
Message-ID <f5c151e204a788607173@dev.null> (permalink)
References (9 earlier) <10vaorr$3r8c4$1@dont-email.me> <10vk256$27ab8$5@dont-email.me> <10vl3kr$2ii0i$1@dont-email.me> <10vmtdr$6c5k$1@solani.org> <71b3fmxhhh.ln2@Telcontar.valinor>

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>On Tue, 2 Jun 2026 17:55:51 +0200, "Carlos E.R." <robin_listas@es.invalid>
>wrote:
>On 2026-06-02 17:38, Marco Moock wrote:
>> Am 02.06.26 um 01:12 schrieb InterLinked:
>>> On 6/1/2026 9:40 AM, Rich wrote:
>
>
>
>>> My point was that copper POTS customers can get speeds in the 40s/50s
>>> calling the same service, no problem at all, but I'm not able to do
>>> that with my service being delivered over fiber. Dial-up Internet
>>> speeds are actually *hampered* by fiber... how ironic is that?
>>
>> This is because the analog signal is being converter to a digital signal
>> by an analog to digital converter - it does not interpret the digital
>> data signal. With ISDN, this was't that faulty, as ISDN is line-
>> switched. IP is packet-switched, so jitter is there and relevant.
>> The VoIP phone signal is also transferred between different carriers,
>> which means there might be codec conversions.
>>
>> TLDR: V.90 is intended for analog lines, not for any digital service.
>
>Huh, no, not fully correct.
>
>V.90 assumes the analog signal from the phone is converted to digital on
>the spot, at the client's exchange.

Right. The useful distinction is not "copper vs fiber" by itself, but whether
the modem path is the old PSTN/PCM path V.90 was designed around. V.90
downstream assumes a digital server-side modem and a mostly-digital phone
network with one final D/A conversion near the subscriber loop.

Once the analog modem signal is created by an ATA/ONT and then packetised as
VoIP, all the boring voice-service details start to matter: codec, jitter
buffer, packet loss concealment, echo cancellation, VAD, transcoding, and
clocking. Even if the access medium is fiber, the modem no longer sees the same
sort of path.

Practical things I would check, if someone actually needs dialup to work over
such a line:

* force G.711/u-law or A-law only, with no compression;
* disable VAD/silence suppression and echo cancellation if the gear allows it;
* give the ATA/ONT traffic decent QoS and avoid WiFi in that path;
* try limiting the modem to V.34/33.6 rather than chasing V.90 speeds.

If that still does not hold, the annoying answer is that the line is fine for
voice but not a transparent modem circuit.

-- 
TheLastSysop <thelastsysop@dev.null>
"I survived the great rm -rf / rehearsal and all I got was this .signature."

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Thread

Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-26 02:21 -0400
  Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-26 08:46 +0200
    Re: Redundancy/Survival Marco Moock <mm@dorfdsl.de> - 2026-05-26 09:49 +0200
      Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-26 04:47 -0400
      Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-26 11:25 +0200
      Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-05-26 09:53 +0000
    Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-26 04:38 -0400
      Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-26 11:35 +0200
      Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-05-26 22:09 +0000
        Re: Redundancy/Survival John Ames <commodorejohn@gmail.com> - 2026-05-26 16:17 -0700
          Re: Redundancy/Survival Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-05-27 00:02 +0000
            Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-27 00:11 -0400
              Re: Redundancy/Survival Marco Moock <mm@dorfdsl.de> - 2026-05-28 10:32 +0200
            Re: Redundancy/Survival Nuno Silva <nunojsilva@invalid.invalid> - 2026-05-27 08:41 +0100
              Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-27 11:04 +0200
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-28 03:31 -0400
                Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-05-28 09:18 +0100
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-28 13:42 +0200
                Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-05-28 15:01 +0100
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-28 21:34 -0400
                Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-05-29 11:07 +0100
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-29 12:55 +0200
                Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-05-29 12:14 +0100
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-29 13:36 +0200
                Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-05-29 13:26 +0100
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-29 19:36 +0200
                Re: Redundancy/Survival Richard Kettlewell <invalid@invalid.invalid> - 2026-05-29 17:24 +0100
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-29 19:37 +0200
                Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-05-29 19:36 +0100
                Re: Redundancy/Survival Richard Kettlewell <invalid@invalid.invalid> - 2026-05-29 22:34 +0100
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-30 04:29 -0400
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-30 13:09 +0200
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-30 23:29 -0400
                Re: Redundancy/Survival InterLinked <usenet@phreaknet.org> - 2026-05-31 21:45 -0400
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-01 12:15 +0200
                Re: Redundancy/Survival InterLinked <usenet@phreaknet.org> - 2026-06-01 18:53 -0400
                Re: Redundancy/Survival Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-06-02 01:46 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-06-02 03:01 -0400
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-02 18:12 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-02 10:16 +0200
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-02 18:09 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-02 21:26 +0200
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-06-02 02:58 -0400
                Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-06-02 11:11 +0100
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-05-29 04:30 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-29 01:34 -0400
                Re: Redundancy/Survival rbowman <bowman@montana.com> - 2026-05-29 06:36 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-31 00:38 -0400
                Re: Redundancy/Survival TheLastSysop <thelastsysop@dev.null> - 2026-05-31 05:09 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-31 03:10 -0400
                Re: Redundancy/Survival TheLastSysop <thelastsysop@dev.null> - 2026-05-31 07:14 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-06-01 00:49 -0400
                Re: Redundancy/Survival TheLastSysop <thelastsysop@dev.null> - 2026-06-01 04:57 +0000
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-01 03:20 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-01 19:45 +0200
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-01 18:30 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-01 22:27 +0200
                Re: Redundancy/Survival TheLastSysop <thelastsysop@dev.null> - 2026-06-02 10:49 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-02 13:16 +0200
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-02 18:35 +0000
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-02 18:21 +0000
                Re: Redundancy/Survival TheLastSysop <thelastsysop@dev.null> - 2026-06-02 18:25 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-02 21:36 +0200
                Re: Redundancy/Survival InterLinked <usenet@phreaknet.org> - 2026-06-01 19:00 -0400
                Re: Redundancy/Survival Robert Riches <spamtrap42@jacob21819.net> - 2026-06-02 17:44 +0000
                Re: Redundancy/Survival TheLastSysop <thelastsysop@dev.null> - 2026-06-02 17:54 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-29 02:17 -0400
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-01 03:50 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-06-01 01:07 -0400
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-01 12:47 +0200
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-01 17:36 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-01 22:33 +0200
                Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-06-01 12:26 +0100
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-01 17:31 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-01 22:49 +0200
                Re: Redundancy/Survival not@telling.you.invalid (Computer Nerd Kev) - 2026-05-30 09:09 +1000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-30 13:17 +0200
                Re: Redundancy/Survival not@telling.you.invalid (Computer Nerd Kev) - 2026-05-31 07:33 +1000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-31 00:14 -0400
                Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-05-31 12:09 +0100
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-06-01 00:51 -0400
                Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-06-01 12:28 +0100
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-31 12:58 +0200
              Re: Redundancy/Survival Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-05-27 20:51 +0000
                Re: Redundancy/Survival John Ames <commodorejohn@gmail.com> - 2026-05-27 14:02 -0700
                Re: Redundancy/Survival not@telling.you.invalid (Computer Nerd Kev) - 2026-05-28 08:54 +1000
                Re: Redundancy/Survival Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-05-28 05:04 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-28 03:54 -0400
                Re: Redundancy/Survival Andy Burns <usenet@andyburns.uk> - 2026-05-28 09:15 +0100
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-01 12:29 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-28 13:45 +0200
                Re: Redundancy/Survival Robert Riches <spamtrap42@jacob21819.net> - 2026-05-29 02:50 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-29 01:17 -0400
                Re: Redundancy/Survival rbowman <bowman@montana.com> - 2026-05-29 06:48 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-30 04:25 -0400
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-30 13:20 +0200
                Re: Redundancy/Survival Robert Riches <spamtrap42@jacob21819.net> - 2026-05-30 14:16 +0000
                Re: Redundancy/Survival Robert Riches <spamtrap42@jacob21819.net> - 2026-05-30 04:00 +0000
          Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-26 23:41 -0400
            Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-05-27 14:09 +0100
              Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-28 03:51 -0400
                Re: Redundancy/Survival rbowman <bowman@montana.com> - 2026-05-28 17:08 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-28 22:14 -0400
                Re: Redundancy/Survival rbowman <bowman@montana.com> - 2026-05-29 04:41 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-29 01:53 -0400
                Re: Redundancy/Survival rbowman <bowman@montana.com> - 2026-05-29 06:32 +0000
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-01 13:19 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-01 22:52 +0200
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-01 13:08 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-01 22:55 +0200
                Re: Redundancy/Survival Nuno Silva <nunojsilva@invalid.invalid> - 2026-06-02 10:39 +0100
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-02 13:21 +0200
        Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-26 22:39 -0400
          Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-05-27 14:10 +0100
            Re: Redundancy/Survival not@telling.you.invalid (Computer Nerd Kev) - 2026-05-28 09:05 +1000
              Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-05-28 08:19 +0100
            Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-28 03:52 -0400
              Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-05-28 09:20 +0100
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-28 20:34 -0400
                Re: Redundancy/Survival InterLinked <usenet@phreaknet.org> - 2026-05-28 21:07 -0400
                Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-01 13:40 +0000
                Re: Redundancy/Survival InterLinked <usenet@phreaknet.org> - 2026-06-01 19:12 -0400
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-02 10:28 +0200
                Re: Redundancy/Survival InterLinked <usenet@phreaknet.org> - 2026-06-02 12:15 -0400
                Re: Redundancy/Survival TheLastSysop <thelastsysop@dev.null> - 2026-06-02 16:19 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-02 18:30 +0200
                Re: Redundancy/Survival The Natural Philosopher <tnp@invalid.invalid> - 2026-06-02 18:29 +0100
                Re: Redundancy/Survival Marco Moock <mm@dorfdsl.de> - 2026-06-02 17:38 +0200
                Re: Redundancy/Survival TheLastSysop <thelastsysop@dev.null> - 2026-06-02 15:48 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-02 17:55 +0200
                Re: Redundancy/Survival TheLastSysop <thelastsysop@dev.null> - 2026-06-02 16:03 +0000
                Re: Redundancy/Survival InterLinked <usenet@phreaknet.org> - 2026-06-02 12:22 -0400
                Re: Redundancy/Survival TheLastSysop <thelastsysop@dev.null> - 2026-06-02 16:36 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-02 18:39 +0200
                Re: Redundancy/Survival rbowman <bowman@montana.com> - 2026-05-29 01:21 +0000
                Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-29 02:08 -0400
                Re: Redundancy/Survival rbowman <bowman@montana.com> - 2026-05-29 06:41 +0000
              Re: Redundancy/Survival Rich <rich@example.invalid> - 2026-06-01 13:23 +0000
                Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-06-01 23:00 +0200
  Re: Redundancy/Survival Marco Moock <mm@dorfdsl.de> - 2026-05-26 09:44 +0200
    Re: Redundancy/Survival c186282 <c186282@nnada.net> - 2026-05-26 04:45 -0400
    Re: Redundancy/Survival "Carlos E.R." <robin_listas@es.invalid> - 2026-05-26 11:38 +0200
  Re: Redundancy/Survival "Worst Case" <fritz@spamexpire-202605.rodent.frell.theremailer.net> - 2026-05-26 17:21 +0200

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