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Author Topic: DLM Testing On BT Home Hub 5 (Type B)  (Read 8453 times)

William Grimsley

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #15 on: January 31, 2016, 09:36:33 PM »

Well, surely it's still worthy of investigation when people face DLM problems?
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Dray

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #16 on: January 31, 2016, 09:48:04 PM »

What are you investigating? We know why and how DLM takes action.
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NewtronStar

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #17 on: January 31, 2016, 09:51:58 PM »

Well, surely it's still worthy of investigation when people face DLM problems?

Not really as we know why & when the DLM takes action it's been well documented by Kitz and as a member I don't want your line to see the DLM because from your posted stats it look way better than my line   :cool:
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WWWombat

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #18 on: February 01, 2016, 03:01:34 AM »

I've been tempted to try soldering an ECI, to see what happens ... and then I might want to induce DLM.

Luckily the wife needs a stable line for work, so I've not managed to combine time and opportunity yet!
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William Grimsley

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #19 on: February 01, 2016, 08:25:05 AM »

Well, I managed to do it! New line stats:

1.   Product Name:   HomeHub5
2.   Serial number:   +076286+1505012010
3.   Firmware version:   v0.07.05.0A13-BT (Type B) Last updated 10/12/2015
4.   Board version:   01
5.   VDSL uptime:   0 days, 00:01:19
6.   Data Rate:   8495 / 39999
7.   Maximum Data Rate:   8954 / 44602
8.   Noise Margin:   6.6 / 7.9
9.   Line Attenuation:   29.5 / 25.9
10.   Signal Attenuation:   0.0 / 0.0
11.   Data sent/received:   1.2 MB / 0.1 MB
12.   Broadband username:   bthomehub@btbroadband.com
13.   BT Wi-fi:   Yes
14.   2.4GHz wireless network/SSID:   BTHub5-F2GC
15.   2.4GHz wireless connections:   Enabled (802.11 b/g/n (up to 144 Mb/s))
16.   2.4GHz wireless security:   WPA2 Only (Recommended)
17.   2.4GHz wireless channel:   Automatic (Smart Wireless)
18.   5GHz wireless network/SSID:   BTHub5-F2GC
19.   5GHz wireless connections:   Enabled (802.11 a/n/ac (up to 1300 Mb/s))
20.   5GHz wireless security:   WPA2 Only (Recommended)
21.   5GHz wireless channel:   Automatic (Smart Wireless)
22.   Firewall:   Default
23.   MAC Address:   4c:09:d4:b4:2a:4e
24.   Software variant:   -
25.   Boot loader:   0.5.0-BT (Tue Jun 17 18:52:56 2014)
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William Grimsley

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #20 on: February 01, 2016, 09:37:18 AM »

I've been tempted to try soldering an ECI, to see what happens ... and then I might want to induce DLM.

Luckily the wife needs a stable line for work, so I've not managed to combine time and opportunity yet!

Yes, I have thought about driving into my Huaewi cabinet...
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WWWombat

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #21 on: February 01, 2016, 10:26:28 AM »

 :lol: "Soldering an ECI" meant one of the CPE modems, not the DSLAM box on the street corner!

As for the line stats, all I can really see is a difference in upstream statistics (where "max" is now > "actual"). The downstream "actual" has altered from a consistent 40000 to 39999. Being one or two bytes below target is quite usual; the change might signify something, but equally might not - this result is much more ambivalent/

Knowing what you were doing, I'd hazard a guess that DLM has intervened upstream.

Ironically, that wasn't one of the changes I'd have expected!
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William Grimsley

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #22 on: February 01, 2016, 10:39:39 AM »

:lol: "Soldering an ECI" meant one of the CPE modems, not the DSLAM box on the street corner!

As for the line stats, all I can really see is a difference in upstream statistics (where "max" is now > "actual"). The downstream "actual" has altered from a consistent 40000 to 39999. Being one or two bytes below target is quite usual; the change might signify something, but equally might not - this result is much more ambivalent/

Knowing what you were doing, I'd hazard a guess that DLM has intervened upstream.

Ironically, that wasn't one of the changes I'd have expected!

Yes, it is interesting. I think G.INP has been turned off as normally G.INP lets the download data rate reach 40000 kbps but with it off it can't reach that. Anyway, we'll see what happens tonight after I do some more disconnections and reconnections of the DSL cable. :lol:
« Last Edit: February 01, 2016, 11:21:31 AM by William Grimsley »
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Dray

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #23 on: February 01, 2016, 11:16:06 AM »

If you connect a Huawei HG612 with the latest unlocked firmware, you will be able to see what G.INP is set to.
Unfortunately with the HH5 you have no clue.
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William Grimsley

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #24 on: February 02, 2016, 08:33:09 AM »

So, after 17 more disconnections and reconnections of the DSL cable, DLM takes action! New line stats:

1.   Product Name:   HomeHub5
2.   Serial number:   +076286+1505012010
3.   Firmware version:   v0.07.05.0A13-BT (Type B) Last updated 10/12/2015
4.   Board version:   01
5.   VDSL uptime:   0 days, 04:21:09
6.   Data Rate:   8447 / 35000
7.   Maximum Data Rate:   9038 / 44340
8.   Noise Margin:   6.3 / 9.6
9.   Line Attenuation:   29.4 / 25.9
10.   Signal Attenuation:   0.0 / 0.0
11.   Data sent/received:   218.1 MB / 124.7 MB
12.   Broadband username:   bthomehub@btbroadband.com
13.   BT Wi-fi:   Yes
14.   2.4GHz wireless network/SSID:   BTHub5-F2GC
15.   2.4GHz wireless connections:   Enabled (802.11 b/g/n (up to 144 Mb/s))
16.   2.4GHz wireless security:   WPA2 Only (Recommended)
17.   2.4GHz wireless channel:   Automatic (Smart Wireless)
18.   5GHz wireless network/SSID:   BTHub5-F2GC
19.   5GHz wireless connections:   Enabled (802.11 a/n/ac (up to 1300 Mb/s))
20.   5GHz wireless security:   WPA2 Only (Recommended)
21.   5GHz wireless channel:   Automatic (Smart Wireless)
22.   Firewall:   Default
23.   MAC Address:   4c:09:d4:b4:2a:4e
24.   Software variant:   -
25.   Boot loader:   0.5.0-BT (Tue Jun 17 18:52:56 2014)
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kitz

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #25 on: February 02, 2016, 02:47:33 PM »

It looks like the DLM is capping the line rate.

That is what Id expect it to do.   Well in actual fact I would first expect it to increase error protection and then cap.   
The HH5B is far from the best router to test with as it doesnt give you any g.inp/retransmission values, so you dont know what its doing on the error protection side.   Need to get a modem/router such as a HG612/Billion/Zyxel to do some proper testing.
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William Grimsley

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #26 on: February 02, 2016, 03:40:16 PM »

It looks like the DLM is capping the line rate.

That is what Id expect it to do.   Well in actual fact I would first expect it to increase error protection and then cap.   
The HH5B is far from the best router to test with as it doesnt give you any g.inp/retransmission values, so you dont know what its doing on the error protection side.   Need to get a modem/router such as a HG612/Billion/Zyxel to do some proper testing.

That's exactly what I've done. Want some stats? Here you go!

Stats recorded 02 Feb 2016 15:41:10

DSLAM/MSAN type:           BDCM:0xa48c / v0xa48c
Modem/router firmware:     AnnexA version - A2pv6F039g1.d24m
DSL mode:                  VDSL2 Profile 17a
Status:                    Showtime
Uptime:                    2 hours 35 min 45 sec
Resyncs:                   0 (since 02 Feb 2016 13:59:08)
         
            Downstream   Upstream
Line attenuation (dB):     25.8      0.0
Signal attenuation (dB):   Not monitored      
Connection speed (kbps):   35000      8493
SNR margin (dB):           9.7      6.7
Power (dBm):               12.0      5.8
Interleave depth:          8      2
INP:                       54.00      53.00
G.INP:                     Enabled      

RSCorr/RS (%):             0.0001      0.0010
RSUnCorr/RS (%):           0.0000      0.0000
ES/hour:                   0      0
« Last Edit: February 02, 2016, 03:42:18 PM by William Grimsley »
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WWWombat

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #27 on: February 02, 2016, 07:28:26 PM »

Agree that it looks like a capped speed. The new stats suggest that retransmission settings were ramped up a lot - standard INP values are in the low 40's, so 54 and 53 are quite high. It probably took a number of steps to get there. The graphs that the HG612-statistics programme could have generated would have been interesting.

Seeing how the modem reacts with the interleaving block size, and the FEC overhead, and more of the retransmission settings would have been useful too, but none are visible in those stats. What modem is it?
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William Grimsley

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #28 on: February 02, 2016, 07:37:47 PM »

Unfortunately, I didn't have this router when I was doing the testing but it's the Billion 8800NL.
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NewtronStar

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Re: DLM Testing On BT Home Hub 5 (Type B)
« Reply #29 on: February 02, 2016, 09:56:55 PM »

Well done that was a fast delivery for the Billion 8800NL that sounds like Amazon  :-\
no more manual disconnects of the modem from now on, get your good self set-up on MDWS and upload the stats from the billion using either DSLstats or HG612_Modem_stats if you have already not done so.
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