5 ms·

Wait, can DSL modems talk to each other instead of a DSLAM line card?

chmod775 4y ago
They may be using the term "modem" loosely here, or rather, more generally than "home modems". https://en.wikipedia.org/wiki/Modem https://en.wikipedia.org/wiki/Modem
crazyjncsu 4y ago
Not a traditional dsl modem, but these work well using dsl technology: https://www.amazon.com/Tupavco-Ethernet-Extender-Kit-Repeater-VDSL/dp/B01BOD8C9W https://www.amazon.com/Tupavco-Ethernet-Extender-Kit-Repeate...
- Dan_Sylveste 4y ago
  I was about to point something like this out.
- xhrpost 4y ago
  That's pretty cool. The specs look like this is both faster and cheaper than the main link of this thread, unless I'm missing something?
- iforgotpassword 4y ago
  According to the description this adds at least 660ms of latency, so might be useless for certain applications. Wonder how much the TFA solution adds.
betaby 4y ago
Most SHDSL and some VDSL can talk each other indeed. Used that capability a lot in 200xs.
geocar 4y ago
Some can at least. I used Netopia SDSL routers without a DSLAM around twenty years ago to serve "high speed internet" in town in the US (Easton Maryland) a few years before they managed to get municipal broadband.
MrBuddyCasino 4y ago
It used to be possible many years ago, when I had a DSL modem as PCI card. There was a windows software that would put it in "server mode", and then you could connect another DSL modem to it and "dial in". Not sure if this is possible anymore, but there are Ethernet repeaters that are based on DSL tech which should work in a similar way.
ajb 4y ago
Its true that the specs are not symmetric in ADSL. The CO (Central Office) end is different from the CPE (Customer Premises Equipment) end, and two CPE devices cannot talk to each other. Among other things, the engineering work had to take into account that at the CO end a bunch of wires would come together and leak RF between each other. G.SHDSL is more common in a 1:1 configuration (although I think the ends may still be not symmetric) because it was designed as a T1 replacement. However some devices that could do a single line of CO were made, that can therefore talk to a CPE. See also https://www.revk.uk/2017/12/its-official-adsl-works-over-wet-string.html https://www.revk.uk/2017/12/its-official-adsl-works-over-wet...

They may be using the term "modem" loosely here, or rather, more generally than "home modems". https://en.wikipedia.org/wiki/Modem https://en.wikipedia.org/wiki/Modem

crazyjncsu 4y ago

Not a traditional dsl modem, but these work well using dsl technology: https://www.amazon.com/Tupavco-Ethernet-Extender-Kit-Repeater-VDSL/dp/B01BOD8C9W https://www.amazon.com/Tupavco-Ethernet-Extender-Kit-Repeate...

Dan_Sylveste 4y ago
I was about to point something like this out.
xhrpost 4y ago
That's pretty cool. The specs look like this is both faster and cheaper than the main link of this thread, unless I'm missing something?
iforgotpassword 4y ago
According to the description this adds at least 660ms of latency, so might be useless for certain applications. Wonder how much the TFA solution adds.

betaby 4y ago

Most SHDSL and some VDSL can talk each other indeed. Used that capability a lot in 200xs.

geocar 4y ago

Some can at least. I used Netopia SDSL routers without a DSLAM around twenty years ago to serve "high speed internet" in town in the US (Easton Maryland) a few years before they managed to get municipal broadband.

MrBuddyCasino 4y ago

It used to be possible many years ago, when I had a DSL modem as PCI card. There was a windows software that would put it in "server mode", and then you could connect another DSL modem to it and "dial in". Not sure if this is possible anymore, but there are Ethernet repeaters that are based on DSL tech which should work in a similar way.

ajb 4y ago

Its true that the specs are not symmetric in ADSL. The CO (Central Office) end is different from the CPE (Customer Premises Equipment) end, and two CPE devices cannot talk to each other. Among other things, the engineering work had to take into account that at the CO end a bunch of wires would come together and leak RF between each other. G.SHDSL is more common in a 1:1 configuration (although I think the ends may still be not symmetric) because it was designed as a T1 replacement. However some devices that could do a single line of CO were made, that can therefore talk to a CPE. See also https://www.revk.uk/2017/12/its-official-adsl-works-over-wet-string.html https://www.revk.uk/2017/12/its-official-adsl-works-over-wet...