Compare ADSL modems/routers by latency

Is there a recent article which compares ADSL modems (modem/router) devices by their internal latency?

I cant find anything.. Google becoming more and more useless with all those 'individualisation' feature kicked in..

I need to find a low latency modem (or modem/router) with good brand and withing reasonable amount of money.

But I need to find the latency figures somehow..

Any ideas?

Never seen anyone test it.

You talking adsl, vdsl, cable or fttp routers?

For most services the wan connection itself is vastly more variable latency wise

Adsl, Andrew ) the hint is in the title..

To be more specific i am interested in 2 kinds of latency.

One is what i called internal - latency between adsl line and the ethernet port. The one which is solely a characteristic of the modem/router.

The other is between the modem adsl port and the isp modem adsl port (which may or may not have relation to my modem - i am not sure whether a better modem can make it slightly less delayed).

So i am looking for the benchmarks on the 'internal' latency..

Presumably some cisco products must lead the band. But i want to find a price/ratio product..

Yes i know what 99% would think. What the heck he is talking about. How difference in 50 microsec would make a difference if you are looking at 100 millisec latency to a meaningful internet service..

May be not. But i'd like to know!

In reply to a post by maxima120:

Presumably some cisco products must lead the band.

Maybe, maybe not.

Home user ADSL in the UK is dominated by PPPoA encapsulation (and PPPoE on FTTC/VDSL). However some ISPs don't use this (notably Sky, but they seem to be moving back to PPPoA). One question to ask router manufacturers is if they have hardware acceleration of the PPP as that will also affect latency of the packets passing from Ethernet to ADSL.

I think there was a page somewhere on fastest routers with WAN to LAN throughput; and there was a thread in the FTTC forum last year about the unexpected overhead that PPPoE causes for those with fast lines (330 Mbps on FTTP).

Thank you. You gave me the right directions.. Will dig in..

However wanted just to point out that throughput isnt related to latency. Not directly. But presumably higher quality modem with higher throughput might have lower latency

However, I suggest that what you are talking about is not compatible with "... good brand and withing reasonable amount of money", unless your definition of "reasonable" is fairly high wrt modems and modem/routers. How far above £100 do you mean?

Edited by RobertoS (Sun 02-Feb-14 11:45:14)

In reply to a post by maxima120:

However wanted just to point out that throughput isnt related to latency. Not directly. But presumably higher quality modem with higher throughput might have lower latency

Yes, agreed. It was the only data point I knew of. However even if you find a router (cisco, juniper, etc) that can route from one side to the other in 1ms (quite possible in enterprise environments with 1 GigE) the added complexity of having to encapsulate the packet in a PPP frame adds a bunch of unknown CPU time and the router software efficiency.

its tricky question, my employer will pay for it... but if the price raises the eyebrows they wont so am not sure.. 200-250? I guess..

Unless they are in huge money trading they'd be better looking after their business than worrying about it.

Even if they are, they would be better getting their auto-trading software re-written in C rather than any C++ or similar higher level language. That's if they can find anyone still able to write a working complex system in it these days.

I know the theme.. But its nothing to do with it..

in this case its just my own preference to get a decent modem.. Obviously nobody can make money on latency trading sitting in the middle of nowhere