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Standard User j0hn83
(fountain of knowledge) Fri 15-Jan-21 01:12:15
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Re: Comparing 2x line stats? new and old? faster maybe?


[re: Magicuk27] [link to this post]
 
There's been a local power cut or a DSLAM reboot.

Check how low the max rates are which is where the line would resync right now.

The increase in sync you see is a result of you reconnecting before other lines.
Standard User MagicUK
(learned) Fri 15-Jan-21 02:12:19
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Re: Comparing 2x line stats? new and old? faster maybe?


[re: j0hn83] [link to this post]
 
powercut at about midnight for about a second so your correct, so looks like il be getting 58mb max on sync and about the 3.3db on the upstream, is that alound on openreach cabinets as i thought it was only downstream that could drop and the upstream should always stay at 6?
Standard User j0hn83
(fountain of knowledge) Fri 15-Jan-21 02:49:53
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Re: Comparing 2x line stats? new and old? faster maybe?


[re: MagicUK] [link to this post]
 
There's a target SNRM set by the DLM and there's the current SNRM. Also known as the target noise margin and current noise margin.

Your line has a target of 6dB (up and down) but it's running lower than that.

You connected at the 6dB target before other lines on the cabinet. As those lines weren't there you synced higher.
The other lines connected after you (likely within a minute). The noise the other lines create (known as crosstalk) knocks the current SNRM (noise margin) down.

The max rate reported knows the target SNRM is 6dB so the max rate is still low.
If/when the DLM lowers the SNRM target to 5dB the max rate will increase.

Your line jumping straight from 6dB to 3dB and the max data rate staying low suggests a power cut or the cabinet rebooting.
The DLM only ever moves the target SNRM in 1dB steps.

The upstream is always a fixed 6dB target (some modems target 6.3dB)


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Standard User MagicUK
(learned) Sat 16-Jan-21 09:51:52
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Re: Comparing 2x line stats? new and old? faster maybe?


[re: j0hn83] [link to this post]
 
Little update, another resync this morning and back to default 6db but have adjusted to fastpath as latency has dropped on broadband quality monitor:

Line Status:
Connected

DSL Modulation Type:
VDSL2

Annex Type:
Annex A/L

Upstream Downstream
Current Rate (Kbps) 17343 48077
Max Rate (Kbps) 17343 49421
SNR Margin (dB) 6.1 6.4
Line Attenuation (dB) 22.5 10.7
Errors (Pkts) 0 0

My Broadband Ping

Edited by MagicUK (Sat 16-Jan-21 09:56:07)

Standard User j0hn83
(fountain of knowledge) Sat 16-Jan-21 10:14:15
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Re: Comparing 2x line stats? new and old? faster maybe?


[re: MagicUK] [link to this post]
 
Not so sure of that myself.

Interleaving adds a minimum 8ms latency and knocks about 10% of the potential sync.
With interleaving enabled the max rate reported is exaggerated and incorrect.

If the line went to fastpath sync should go up, max rate down, latency would drop by 8ms.

Only the latency changed, by what looks like less than 8ms (hard to tell on a BQM).

It could just be a change of routing from the ISP.

Does your modem have any more stats?
Standard User MagicUK
(learned) Mon 18-Jan-21 07:53:20
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Re: Comparing 2x line stats? new and old? faster maybe?


[re: j0hn83] [link to this post]
 
no further stats as using a 9970 modem, line dropped at 3am and SNR on downstream dropped to 5:

Line Status:
Connected

DSL Modulation Type:
VDSL2

Annex Type:
Annex A/L

Upstream Downstream
Current Rate (Kbps) 15175 51192
Max Rate (Kbps) 15175 53372
SNR Margin (dB) 6 5.4
Line Attenuation (dB) 22.5 10.7
Errors (Pkts) 0 0
Standard User MagicUK
(learned) Mon 15-Feb-21 20:59:43
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Re: Comparing 2x line stats? new and old? faster maybe?


[re: MagicUK] [link to this post]
 
switched back to my huewei 3b modem, line seems to have improved, no g.inp on upstream yet and at 4db snr on down stream also!

DSLAM type / SW version: BDCM:0xa4a1 (164.161) / v0xa4a1
Modem/router firmware: AnnexA version - A2pv6C038m.d24j
DSL mode: VDSL2 Profile 17a
Status: Showtime
Uptime: 11 hours 22 min 56 sec
Resyncs: 1 (since 14 Feb 2021 07:28:49)

Downstream Upstream
Line attenuation (dB): 17.7 0.0
Signal attenuation (dB): Not monitored
Connection speed (kbps): 61571 17763
SNR margin (dB): 4.1 6.0
Power (dBm): 13.5 7.6
Interleave depth: 4 1
INP: 52.00 0
G.INP: Enabled Not enabled
Vectoring status: 5 (VECT_UNCONFIGURED)

RSCorr/RS (%): 0.0018 0.1561
RSUnCorr/RS (%): 0.0000 0.0000
ES/hour: 1.19 2.43
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