Can 2 DSL modems share the same line?

[Pedro]

I have never tested but I have a guy reporting he does it all the time!

I always thought that it would not be possible because each modem sync with the DSLAM would conflict with the other...


Am I wrong here?... Anyone?

I haven't had time yet to research on this but I plan on doing it soon...


:confused:

[BosonMichael]

No. A router is your only option for line sharing.

[Pedro]

No. A router is your only option for line sharing.

Hi TM,

Thanks for your reply but, can you elaborate a little more your answer?
:ermm:

[BosonMichael]

Hi TM,

Thanks for your reply but, can you elaborate a little more your answer?
:ermm:

No, not really. It simply won't work, from what I have seen (and read on DSL newsgroup postings). Search for yourself and see. I honestly don't know the technical reason behind the answer. However, if you have someone who says that you can do it, by all means, buy another modem and try. You asked, I answered.

Why would you want two modems for one line anyway? What would it provide that a router will not?

[d-Faktor]

i'm no dsl expert, but as far as i know, this can't be done.

just like you cannot have two different simultaneous phonecalls using one analog phoneline. dsl is not much different. only one device can sync, the other cannot. it's still point-to-point. and if you're wondering about the speech and data using one connection, that's because these are using different frequencies on the line, so they are not "fighting" for the connection.
so sure, you can use two modems, but one has to be switched off (and actually be disconnected completely). and if your isp uses validation on mac address, you are really restricted to one modem.

so what is it you are trying to achieve?

[Pedro]

No, not really. It simply won't work, from what I have seen (and read on DSL newsgroup postings). Search for yourself and see. I honestly don't know the technical reason behind the answer. However, if you have someone who says that you can do it, by all means, buy another modem and try. You asked, I answered.

Hey, I am from the same opinion you are, that it cannot be done.
I was just checking since I've never tried and we should always be humble enough to admit not knowing ALL the tricks technology can offer and that there is ALWAYS someone who knows more then you do!
Or another way of saying was, "I was just checking"... :classic:


i'm no dsl expert, but as far as i know, this can't be done.

just like you cannot have two different simultaneous phonecalls using one analog phoneline. dsl is not much different. only one device can sync, the other cannot. it's still point-to-point. and if you're wondering about the speech and data using one connection, that's because these are using different frequencies on the line, so they are not "fighting" for the connection.
so sure, you can use two modems, but one has to be switched off (and actually be disconnected completely). and if your isp uses validation on mac address, you are really restricted to one modem.

so what is it you are trying to achieve?

Not trying to achieve anything.. I don't even use DSL, I use cable.
Just that I started yesterday in a new Job in a support line for DSL connections for a Major Telecom and that one of guys there was saying he knows it can be done and I was trying to convince him that it cannot, but I had no technical arguments to convince him.
Off course I gave him some credit for his experience in the matter but i wasn't convinced anyway.

I think I have found some resources to convince him about my views...

This site is very good: DSL Forum (http://www.dslforum.org/about_dsl.htm)

[snoopy51]

Unless he meant bonding. Bonding is a mean to increase bandwidth and it is different from load balancing.


Load balancing is the process of spreading out data streams across different connections. For example, say that we are on a two user network and user one is downloading an ISO. His data will go through connection one (assuming two ISP connections). When user two tries to use the internet, the load balancing router/software senses that connection one is busy and routes user two's data across the second ISP connection. In this situation, having two 1024kbps circuits does not mean that each computer has 2048kbps available to them, only 1024kbps (each computer only can use only one ISP circuit).

Circuit bonding*/muxing is a very different approach to increasing your bandwidth. Unlike load balancing, the bits of all clients are spread across all connections. So, unlike the above example, two 1024kbps circuits will equal 2048kbps (and each computer has all of that bandwidth available, unlike above). However this approach is much more expensive. Circuit bonding requires two routers and two devices called "muxs". One router and "mux" is placed at the ISP end and the other router and "mux" is placed at the customer end. You ISP must support this configuration as well, and often times providers will only do this type of connection with T1 circuits.

Using two DSL modems share the same line? Please ask your friend how they do that? I like to find out more about that option?