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Author Topic: Attainable rate lower sync rate.  (Read 6799 times)

forceware

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Attainable rate lower sync rate.
« on: July 15, 2015, 04:35:32 PM »
I've just had a DLM reset performed and the sync rate is higher than the attainable rate. Is this normal? If not what can I do as es seam to be rising fast. I've switched of for half an hour and then on again but to no avail. Traffic lights are no yellow on mydslstats. I would be very happy with a far lowered sync rate and less errors
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NewtronStar

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Re: Attainable rate lower sync rate.
« Reply #1 on: July 17, 2015, 05:40:24 PM »
I am not sure if you line will stay like this on Fastpath as the traffic lights are all red in the DLM error indicator, you will know in the wee small hours on the 18th if the DLM takes action.

even though your hourly DS errored seconds has decreased it's the accumulation of errored seconds for a 24 hour period and it's showing 2553 at 5pm it not looking good.
« Last Edit: July 17, 2015, 05:47:39 PM by NewtronStar »
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Weaver

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Re: Attainable rate lower sync rate.
« Reply #2 on: July 17, 2015, 11:21:17 PM »
Ask your ISP to put you on interleave=on, rather than =auto. This might make your speed better and certainly improve your reliability but your latency will go up if that matters to you.
I have  got my ISP to lock my lines onto interleave=ON for the big performance improvements it brings and I'm not a gamer so there's no downside for me. 
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GigabitEthernet

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Re: Attainable rate lower sync rate.
« Reply #3 on: July 17, 2015, 11:28:16 PM »
I'm pretty sure the ISP has no control over FTTC interleaving: DLM has that control.
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burakkucat

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Re: Attainable rate lower sync rate.
« Reply #4 on: July 17, 2015, 11:36:09 PM »
As forceware has a service delivered by VDSL2, it is the DLM that will decide on the interleave status. ISPs/CPs cannot make such an adjustment. They can make limited requests for a particular type of profile to be applied to the circuit.

As the circuit has just had a DLM reset (a circuit re-calc, if I am remembering B*Sheep's explanation correctly), it will be essentially as a newly commissioned circuit. The DLM will observe and take action, if required.
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Weaver

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Re: Attainable rate lower sync rate.
« Reply #5 on: July 18, 2015, 12:10:25 AM »
Apologies guys, I’m still living in the ADSL era. I'm assuming too much. My ISP was happy to lock this setting down for ADSL1 but please forgive my ignorance re VDSL.
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burakkucat

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Re: Attainable rate lower sync rate.
« Reply #6 on: July 18, 2015, 01:38:26 AM »
Quote from: Weaver on July 18, 2015, 12:10:25 AM
Apologies guys, I’m still living in the ADSL era. I'm assuming too much. My ISP was happy to lock this setting down for ADSL1 but please forgive my ignorance re VDSL.

No problem.  :drink:
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forceware

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Re: Attainable rate lower sync rate.
« Reply #7 on: July 18, 2015, 10:17:41 PM »
Thank you for your replies. Yes unfortunately dlm did decide to interleave me, but I'm hoping for green lights for 9 days. I've had a mk3 faceplate installed and had all the extention wiring removed from the master socket to keep any interferance to a minimum. Yes I am a gamer, call of duty ps4. The game is very different with interleaving applied. Although I don't understand why as human reaction time is roughly 260ms and this is only an additional 8ms! My be its something in the game code. For me personally I would like it if they could cap my line at 10mb down and have a 9db snr, as most of my errors come at night when my line drops 1.5db.
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GigabitEthernet

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Re: Attainable rate lower sync rate.
« Reply #8 on: July 18, 2015, 10:20:54 PM »
It may well be quicker than 9 days.

Does DLM take into account previous line conditions?

If for example a line previously had no interleaving and then suddenly an event caused it to be enabled, would DLM "know" to remove it quickly when the line was returned to its prior state?
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forceware

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Re: Attainable rate lower sync rate.
« Reply #9 on: July 18, 2015, 10:27:23 PM »
From what I understand from burakkucat My dlm has no previous history to refer to as there has been a dlm reset, so you may be right. Hopefully it's quicker.
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GigabitEthernet

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Re: Attainable rate lower sync rate.
« Reply #10 on: July 18, 2015, 10:31:43 PM »
Ah I didn't see that. My apologies :)
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burakkucat

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Re: Attainable rate lower sync rate.
« Reply #11 on: July 19, 2015, 01:05:29 AM »
If an HG612 or other device with a Broadcom chipset is being used, it is possible to cap ones own circuit by issuing the appropriate command . . .

The only problem is I have forgotten the incantation that one must utter.  :-[

Perhaps someone else can assist, please?
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forceware

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Re: Attainable rate lower sync rate.
« Reply #12 on: July 19, 2015, 07:39:51 AM »
Yes it is a hg612 being used, and has the sp08 firmware installed. I would very much appreciate is if someone could tell me the commands I need to utter, and indeed how to utter them.
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NewtronStar

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Re: Attainable rate lower sync rate.
« Reply #13 on: July 19, 2015, 11:24:33 PM »
You will need to gain access to telnet and sh the command is >
xdslcmd configure --maxDataRate 00000 00000 00000

you need to find the best datarate for each of the three inputs in bold for your line and it's been a while since i last used that comand sorry

I remember burakkucat helping me in the past to find good balance and use a calculator to find the numbers to use in the inputs in bold.

found it http://forum.kitz.co.uk/index.php/topic,14810.msg277018.html#msg277018
reply 7
« Last Edit: July 19, 2015, 11:37:17 PM by NewtronStar »
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burakkucat

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Re: Attainable rate lower sync rate.
« Reply #14 on: July 19, 2015, 11:54:41 PM »
I believe a good rule of thumb for the three parameters is <desired DS rate>, <desired US rate> and the <sum of the two preceding values>

xdslcmd configure --maxDataRate <desired DS rate cap> <desired US rate> <sum of the two preceding values>

Thanks are due to N*Star for jogging my memory. (I'm sure les-70 has practical experience in this method of self rate capping.  :-\  )
« Last Edit: July 20, 2015, 12:15:36 AM by burakkucat »
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