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Author Topic: Any value ... ??  (Read 12107 times)

Black Sheep

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Any value ... ??
« on: August 08, 2017, 01:56:13 PM »

Have noticed over the last few weeks that my FTTC 80/20 service, was dropping connection 1/2 times a day ......... something it hasn't done before.

I noticed I was on a 'Sub 6dB' profile with my SNR sat about 3.7dB and I'm also on 'Retransmission'. I am getting 69Mbps with those profiles applied.

Not being fussed with speed, (more-so stability, as I watch IPTV) ..... I thought I'd remove the 'Sub 6dB' profile and perform a 'Circuit re-calc'. Obviously 'retransmission' will also be removed for a few days due to this.

The result ............... ta-daaaaar ........... I'm now sat at 49Mbps on a 6dB profile. Thought the stat-harvesters amongst you may benefit from this tiny snippet of info ?? If not, just ignore the rantings of a bored bloke.  ;) :)


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j0hn

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Re: Any value ... ??
« Reply #1 on: August 08, 2017, 03:57:40 PM »

Lucky for some! I'm stuck on interleaving on my Huawei cab :(
Throw 1 of those circuit re-calc's in this direction! perks of the job  ;)

That's what I would expect to happen. Sync drop due to the higher 6dB default SNR target, a further drop due to retransmittion being removed, and the overheads from FEC+interleaving being applied.
69Mbps to 49Mbps is quite the drop though.
Can I ask what modem you use?
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Talktalk FTTP 550/75 - Speedtest - BQM

Black Sheep

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Re: Any value ... ??
« Reply #2 on: August 08, 2017, 04:07:11 PM »

Ha ha ............. alas, I can't perform DLM resets for others. A total no-no, I'm afraid.  :angel:

Yeah, 20Mbps is quite a drop which is why I thought it noteworthy of handing the info over to the forum (you guys), for their information.
I'm using the Hub5.  :) :)
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burakkucat

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Re: Any value ... ??
« Reply #3 on: August 08, 2017, 04:33:11 PM »

I'm using the Hub5.  :) :)

In all seriousness, it might be worth your while testing with something else.  :o

"What do I recommend?", you ask. "Absolutely anything", is my response, "just as long as it is not a 'BT HHn' or 'BT BHn' (where the 'HH' expands to be 'Home Hub', the 'BH' expands to be 'Business Hub' and the 'n' is a decimal digit)."

ZyXEL VMGnnn devices are the current predominant choice by numerous Kitizens.
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Black Sheep

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Re: Any value ... ??
« Reply #4 on: August 08, 2017, 04:43:38 PM »

In all seriousness, it might be worth your while testing with something else.  :o

"What do I recommend?", you ask. "Absolutely anything", is my response, "just as long as it is not a 'BT HHn' or 'BT BHn' (where the 'HH' expands to be 'Home Hub', the 'BH' expands to be 'Business Hub' and the 'n' is a decimal digit)."

ZyXEL VMGnnn devices are the current predominant choice by numerous Kitizens.

Ha ha, thanks for the advice, Mr Cat, but you know me ... I'm more than happy with my service and once retransmission is re-applied, I'll end up with more bandwidth again.

The whole aim of the post was purely for awareness purposes .... if anybody should pop along on the forum, shouting that they've lost 20Mbps since their BTHHn was reset ... well, my example could be the very reason why ??

I do not want to enter the world of micro-managing my connection, if I could, I'd give 20Mbps of it to anyone who wanted it, I don't need it all ....... I just want stability.  ;) ;D ;D ;D
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Dray

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Re: Any value ... ??
« Reply #5 on: August 08, 2017, 05:25:14 PM »

Stability is easily achieved wirh a HG612 modem by capping the sync speed.
Using an HH* leaves you open to BT 'managing' your connection e.g. the 14-day reboot.
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kitz

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Re: Any value ... ??
« Reply #6 on: August 08, 2017, 09:40:08 PM »

20Mbps loss sounds about right.

Based on a 60Mbps sync, each 3dB of SNRm is worth approx 11Mbps.
Addition of FEC overheads could be costing circa 8-9Mbps based on previous average G.INP -> INP3 figures we were seeing a few years ago.

Add the 2 together and voila 20Mbps :(

Quote
I'm using the Hub5.

Do you know which variant?  The HH5B (BCM based) is better than the HH5A.

Quote
I'm more than happy with my service and once retransmission is re-applied,

Could you please let us know when it does.  Some of us are trying to see if there's any sort of pattern to length of time.
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Chrysalis

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Re: Any value ... ??
« Reply #7 on: August 08, 2017, 10:21:23 PM »

black sheep, temporary tho, DLM will probably take you back to where you were, will you keep fighting it and go in a loop? :)
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GigabitEthernet

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Re: Any value ... ??
« Reply #8 on: August 09, 2017, 02:56:20 AM »

We all just need to become engineers and we'd never have DLM  issues again.
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banger

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Re: Any value ... ??
« Reply #9 on: August 09, 2017, 03:45:33 AM »

If only to be able to do your own circuit recalc.  :fingers:
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Tim
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jelv

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Re: Any value ... ??
« Reply #10 on: August 09, 2017, 07:50:53 AM »

Stability is easily achieved wirh a HG612 modem by capping the sync speed.
When I had a HG612 I was syncing at 80 with the achievable over 100 - that must be equivalent to capping the sync speed. However most days when the central heating clicked on or off I had a drop.

Since I changed to a ZyXEL VMG1312-B10A I haven't had a single drop due to the central heating.

The conclusion I've reached is that if you want stability a ZyXEL is better than anything BT provide.
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Dray

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Re: Any value ... ??
« Reply #11 on: August 09, 2017, 08:24:05 AM »

 Not exactly. Capping the sync raises the snrm which increases stability
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Ronski

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Re: Any value ... ??
« Reply #12 on: August 09, 2017, 08:30:50 AM »

Jelv is right, If you have an attainable of a 100, and are syncing at 80, then the sync is capped at 80 and the snrm will be higher.
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Dray

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Re: Any value ... ??
« Reply #13 on: August 09, 2017, 08:35:24 AM »

That's the question, what was the snrm?
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Ronski

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Re: Any value ... ??
« Reply #14 on: August 09, 2017, 09:38:43 AM »

If you look on MDWS  all user stats you'll see the effect  on plenty of users,  more so with users on a 40 Mbps product, as they are being capped at 40 Mbps.
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