Optimize WLAN Bridge as Low Latency connection for DSL Bonding

RouterOS General
1

Hi,
i will setup a 5Ghz STX Lite Bridge which has lowest possible latency. Bandwidth is secondary.

I want to bond DSL Lines, 3 wired connected lines already bonded.
Now an additional line should integrated to the bonding. But this line will be connected over the WLAN Bridge, not wired.
Therefore I looking for lowest possible latency.

But there a lot of options to play with, i have no idea which option will influence the latency?

Any ideas, recommendation’s, experience?

Thanks,
Regards
Marcus

2

Nstream will be the best option for lowest latency (if like you mentioned, throughput is secondary).

3

Thank you for replay. I will try, any other options which could impact the latency ?

4

disabling higher data-rates improve stability

personally when i need stability with good signal levels i only use 24mbit 802.11g data-rate, it sacrifices throughput but improve reliability

5

I don’t get your setup, were you asking about how to achieve that 4 DSL lines bonded and over wired / wlan with lowest latency, or you meant the bridge itself?

for nstreme or nv2 with 11n you can get better latency and stability than 802.11n or g alone as long as the highest modulation chosen is stable for the link.

In your scenario, if distance is < 3km using nstreme you can for sure setup a link with rock-solid 0-2ms latency up to 70Mbps and more.

Nv2 usually provides more throughput but trading it for latency.

6

Hi Pukkita,
many thanks for your answer.

I want two bond 4 DSL Lines.3 DSL Lines (Modems) weired connected to the router and already bonded. Additional i plan to add 1 DSL Line from the neighbor building over WLAN.

Problem with bonding is that included DSL Connections should have near the same low latency, because if not it wast performance of the bonded channel.

Therefor i looking for a WLAN solution with lowest latency.

One question, if i want to use nstreme, i gues i need to

a. select nstreme as wirless protocol on the ‘wirless’ tab of the WLAN interface
b. enable nstreme on the ‘nstreme’ tab of the WLAN interface

Is that correct ?

Thanks,
regards
Marcus

7

dsl add 10-30ms of latency, with that in mind i think any optimal-stable wireless setting will be enough, and dsl is also limited on upload speed

8

You are right, low and stable latency would be need to get high bonding performance.

9

That’s it Umarcus. As chechito said DSL usually has much more latency that a properly tuned PTP.

10

Yes thats right, properly tuned, that’s why i’m asking :slight_smile:

Much more ? Please keep in mind 1ms or 2ms are 10%-20% from 10ms, a stable 1ms connection is ok, recently i try a 2.4GHz TP Link / OpenWRT setup, result was it is not stable, i get latency between 2ms to 10ms.

Regards
Marcus

11

Depending on traffic load 0-2ms typical. What’s the bandwidth of those DSL lines.

12

Bandwidth is small, 3 or 2 MBit per DSL Line (currently no more available in my village :frowning: ). Actual 3 + 3 + 2 Mbit bonded via L2TP Tunnels, result in ~7.5Mbit throughput.

Per WLAN an additional 2 Mbit Line shall be integrated.

13

So we are speaking 10Mbps… latency will be 0ms