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Standard User youngsyp
(member) Tue 02-Jan-18 11:53:37
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Drop in upstream sync


[link to this post]
 
Hi,

After just randomly checking my connection this morning I noted a drop in upstream sync from around 9.9Mb/s down to 5.9Mb/s. This seems to have been accompanied by a reduction in upstream output power from circa 4.7dBm to 1.8dBm. A coincidence?

I span up DSLstats and note the linked bitloading graph, which seems a little unusual to me?!

Any advice welcome.

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Target SNRM:
Current sync: 55000/ 9999
G.INP: Enabled
Standard User MHC
(sensei) Tue 02-Jan-18 13:26:15
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Re: Drop in upstream sync


[re: youngsyp] [link to this post]
 
What do you think is abnormal?

There is nothing that really stands out as a major issue.


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

M H C


taurus excreta cerebrum vincit
Standard User youngsyp
(member) Tue 02-Jan-18 14:03:22
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Re: Drop in upstream sync


[re: MHC] [link to this post]
 
Yes I think you're right. On further reading, the tones seem normal, I just don't remember seeing the upstream tones split like that before. I expected them to all be on the left hand side as per ADSL.

That aside, would a drop in upstream output power typically result in a reduction in upstream sync?

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Target SNRM:
Current sync: 55000/ 9999
G.INP: Enabled


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Standard User youngsyp
(member) Tue 02-Jan-18 14:47:13
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Re: Drop in upstream sync


[re: youngsyp] [link to this post]
 
I've had a response to my ticket from IDNet and they've stated there's a 'Battery Contact' fault in the line.
Have to disconnect my gateway and faceplate from the line for them to confirm, with a test. Can't do that remotely though unfortunately.

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Target SNRM:
Current sync: 55000/ 9999
G.INP: Enabled
Standard User MHC
(sensei) Tue 02-Jan-18 15:11:54
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Re: Drop in upstream sync


[re: youngsyp] [link to this post]
 
They have always been split and there is another upstream band between tones 1972and 2782. I also prefer to have the SNR graph on the same display - under <Configuration>, <Items to Monitor> check teh box under <Others> to display SNR per tone Included with Bitloading.


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

M H C


taurus excreta cerebrum vincit
Standard User burakkucat
(experienced) Tue 02-Jan-18 15:22:20
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Re: Drop in upstream sync


[re: youngsyp] [link to this post]
 
In reply to a post by youngsyp:
I span up DSLstats and note the linked bitloading graph,
Please be aware that service based on a Profile 17a G.993.2 connection has 4096 sub-carriers.

You have not configured DSLstats correctly, for it is only showing (approximately) the first 1386 sub-carriers on the plot to which you have linked.

100% Linux and, previously, Unix.
Standard User Zarjaz
(eat-sleep-adslguide) Tue 02-Jan-18 16:16:42
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Re: Drop in upstream sync


[re: youngsyp] [link to this post]
 
Summat horribly wrong if the battery contact is on you extension wiring ... and it takes a true klutz to send voip dial tone back towards the exchange .....

so most likely you’ve a good old fashioned telephone line fault. Be aware that the engineer who clears the fault will not be performing a DLM reset, so you’ll have to wait for the upstream to return.

Standard User youngsyp
(member) Wed 03-Jan-18 09:47:56
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Re: Drop in upstream sync


[re: burakkucat] [link to this post]
 
In reply to a post by burakkucat:
In reply to a post by youngsyp:
I span up DSLstats and note the linked bitloading graph,

You have not configured DSLstats correctly, for it is only showing (approximately) the first 1386 sub-carriers on the plot to which you have linked.
Thanks. Will have a look at the config this evening and correct where necessary.

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Target SNRM:
Current sync: 55000/ 9999
G.INP: Enabled
Standard User youngsyp
(member) Wed 03-Jan-18 09:52:51
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Re: Drop in upstream sync


[re: Zarjaz] [link to this post]
 
In reply to a post by Zarjaz:
Summat horribly wrong if the battery contact is on you extension wiring ... and it takes a true klutz to send voip dial tone back towards the exchange .....

so most likely you’ve a good old fashioned telephone line fault. Be aware that the engineer who clears the fault will not be performing a DLM reset, so you’ll have to wait for the upstream to return.
Agreed but I guess it's just procedure for them to confirm where the fault is most likely to lie.

IDNet confirmed the fault was still there last night after I unplugged the gateway and faceplate and they re-ran the phone line test. So next step is for them to organise an OR engineer visit. Hoping I don't need to be at home but suspect I'll have to be.

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Target SNRM:
Current sync: 55000/ 9999
G.INP: Enabled
Standard User youngsyp
(member) Wed 03-Jan-18 10:23:15
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Re: Drop in upstream sync


[re: MHC] [link to this post]
 
In reply to a post by MHC:
They have always been split and there is another upstream band between tones 1972and 2782. I also prefer to have the SNR graph on the same display - under <Configuration>, <Items to Monitor> check teh box under <Others> to display SNR per tone Included with Bitloading.
Bitloading chart with the correct configuration in place and SNR per tone displayed.

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Target SNRM:
Current sync: 55000/ 9999
G.INP: Enabled
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