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1457 posts

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  # 841437 22-Jun-2013 11:38
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Well, since my attenuation dropped dropping from 55mbit to 50, I figured I'd try a little experiment:



Yeah, it didn't work :D  But hey, at least we know now!  Pretty sweet error rate tho eh! :D

Hey, has anyone with a 7340 tried the latest firmware?

'That VDSL Cat'
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  # 841440 22-Jun-2013 11:39
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thats quite a speed drop!




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Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.


 
 
 
 


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  # 841442 22-Jun-2013 11:48
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A little better....





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'That VDSL Cat'
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  # 841452 22-Jun-2013 12:22
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gained more of the spectrum there, thats good..




#include <std_disclaimer>

 

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.


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  # 841454 22-Jun-2013 12:30
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sidefx: It must be the day for DLM changes because I finally got bumped back to DLM4 this morning.

I got a DLM change too. Back to DLM-1. Strangely, my sync is lower than it was on DLM-2: 66688 now vs 69144 before. Thought I'd try untweaked again, so Sam, if you're still tracking this, here's a new entry:

Attenuation, Distance, Sync, Profile, DLM, CRCPM, SNRM, SNRMT
SamF: 9db, 300m, 49.5mbit, 8b, 1, 0.09, 11, 0
HowickDota: 6db, 150m, 62.8mbit, 17a, 1, 0.3, 12?, 0?
JamesL: 12-13db, 400m, 34.2mbit, 8b, 1, ?, 12?, 0?
SteveH: 4db, 130m, 47968, 8b, 1, 3, 11, 0
SteveH: 5db, 130m, 44720, 8b, 1, 0.87, 11, 0
SteveH: 5db, 130m, 44720, 8b, 1, 0.52, 11, 0
SteveH: 5db, 130m, 43872, 8b, 1, 0.82, 12, +1
SteveH: 5db, 130m, 42296, 8b, 1, 0.14, 13, +2
SteveH: 5db, 130m, 49576, 8b, 1, 6, 5, 0 (weird sync with very low SNRM)
SteveH: 5db, 130m, 50608, 8b, 1, 19, 11, 0 (another weird sync though SNRM is normal)
SteveH: 6db, 130m, 58616, 17a, 1, 0.08, 14, 2
SteveH: 6db, 130m, 69144, 17a, 2, 0.03, 10, -2
HowickDota: 11db, 400m, 38.4mbit, 8b, 6, 0, 12, 0
fellaintga: 8dB, 200m, 55856, 17a, 1?, 0.02, 12, 0
SteveH: 6db, 130m, 63200, 17a, 1, 0, 12, 0

The connection has only been up about 45 minutes and I haven't had any errors yet. No doubt I'll get some eventually.



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  # 841495 22-Jun-2013 14:06
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@hio77: Yeah, but I am running with a +10db SNRM... :D  That's a 1.4mbit drop per DB btw.  Errors are still ABSOLUTELY ZERO tho!! LOL



@stevehodge: Cool, let me know when you've been running for 24hrs and we'll see what the error rate is.

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  # 841499 22-Jun-2013 14:16
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Wow, where's my 0 error rate at!?!?! :(

 
 
 
 




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  # 841522 22-Jun-2013 15:05
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Put your SMRM to +10 and you can have 0 errors too :-)

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  # 841551 22-Jun-2013 15:26
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DLM change here too, finally on DLM-1 : )

HowickDota: 11db, 400m, 41.7mbit, 8b, 1, 1, 12, 0





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  # 841554 22-Jun-2013 15:33
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SamF: Put your SMRM to +10 and you can have 0 errors too :-)


And lose more Downstream throughput than many people have to start with (on ADSL :P)

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  # 841568 22-Jun-2013 15:55
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sidefx:
SamF: Put your SMRM to +10 and you can have 0 errors too :-)


And lose more Downstream throughput than many people have to start with (on ADSL :P)

For me the 1ms latency is not worth the massive drop in sync rate but if you're mainly gaming it might be worth it.

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  # 841571 22-Jun-2013 16:06
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Even with gaming, I can live with the 8ms profiles... A middle ground between 8 and 1 would be nice though.

Speed drop becomes not worth it pretty fast imo.
Have to remember consistency is a big thing in latency too for gamers .. jittering of 5~10 ms is very noticeable for me at least.

To many factors, 14ms lower latency is far less of an improvement vs littering about .
Now on a decent 17a link, that 14ms could be a huge improvement on TCP latency in terms or single streams..




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Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.


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  # 841573 22-Jun-2013 16:08
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Well finally after about three weeks or so since getting a port refresh I've made it back to DLM-2 I think. yay..... Has been stuck on DLM-4 for ages!

Only thing I've done recently was test two other VDSL modems, a Thompson 789 and a Telecom thingy for about 5 minutes a few days ago.




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  # 841589 22-Jun-2013 16:59
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@insane: Do you have a comparison of sync rates etc between all the modems?

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  # 841595 22-Jun-2013 17:22
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SamF: @insane: Do you have a comparison of sync rates etc between all the modems?


Well that just so happens to be what I was testing :)

Zyxel p-870h-51a v2 - 52/10 (DLM4)
Thompson tg789vn - 51/10 (DLM4)
Telecom Pace V5542 - 52/10 (DLM4)

Sticking with the Zyxel in full bridge mode with my Cisco E4200 router running Tomato USB.


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