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Author Topic: VDSL Advice  (Read 8177 times)

tickmike

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Re: VDSL Advice
« Reply #15 on: May 26, 2017, 03:05:22 PM »

Some modems / routers you have to turn on Telnet !.
You could use a web browser to check the settings page..
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I have a set of 6 fixed IP's From  Eclipse  isp.BT ADSL2(G992.3) line>HG612 as a Modem, Bridge, WAN Not Bound to LAN1 or 2 + Also have FTTP (G.984) No One isp Fixed IP >Dual WAN pfSense (Hardware Firewall and routing).> Two WAN's, Ethernet LAN, DMZ LAN, Zyxel GS1100-24 Switch.

kitzuser87430

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Re: VDSL Advice
« Reply #16 on: May 26, 2017, 04:18:56 PM »

At the telnet password prompt...just type the password then press enter. There may be no Astrix or no characters shown...just type the password then press enter..

Ian
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Tacitus

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Re: VDSL Advice
« Reply #17 on: May 26, 2017, 05:03:45 PM »

Some modems / routers you have to turn on Telnet !.
You could use a web browser to check the settings page..

Yes you can turn on/off telnet on the 3300.  I checked via the browser and it's switched on with the proviso that it's accessed from a single IP which is the machine I use for admin tasks.  I checked just in case I'd mucked up the Ips somewhere...

At the telnet password prompt...just type the password then press enter. There may be no Astrix or no characters shown...just type the password then press enter.
Ian

Tried that as well. Basically there is no response.

As I said I've not had a problem with telnet and other routers so I really can't fathom what's happening here.  However, I've got most of what I need from the browser interface so maybe leave it for the time being as everything seems to have settled down.
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Tacitus

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Re: VDSL Advice
« Reply #18 on: June 01, 2017, 08:26:43 AM »

Looks as though DLM has relented and I'm back up to 39,999 (capped 40mbps).

My Broadband Ping

A drop in connection at around 8:15am suggests something may have been done at the cabinet, although the high ES around that time may have forced the reconnect.  If the latter was the case I would have expected DLM to either maintain or lower the connection speed.

Still all is currently OK, until the next bout of instability....  :(

============================================================================
    VDSL Training Status:   Showtime
                    Mode:   VDSL2 Annex B
            VDSL Profile:   Profile 17a
            Traffic Type:   PTM Mode
             Link Uptime:   0 day: 23 hours: 55 minutes
============================================================================
       VDSL Port Details       Upstream         Downstream
               Line Rate:     10.057 Mbps       39.998 Mbps
    Actual Net Data Rate:      9.999 Mbps       39.999 Mbps
          Trellis Coding:         ON                ON
              SNR Margin:        8.4 dB           11.1 dB
            Actual Delay:          0 ms              0 ms
          Transmit Power:        7.4 dBm          13.9 dBm
           Receive Power:       -6.3 dBm          -5.3 dBm
              Actual INP:        0.0 symbols      52.0 symbols
       Total Attenuation:        0.0 dB          19.0 dB
Attainable Net Data Rate:     12.770 Mbps       56.542 Mbps
============================================================================
      VDSL Band Status    U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):  7.0    29.2    43.2     N/A    13.8    34.5    55.4   
Signal Attenuation(dB):  7.0    28.7    42.5     N/A    17.0    34.2    55.4   
        SNR Margin(dB):  8.5     8.4     8.4     N/A    11.1    11.1    10.9   
   Transmit Power(dBm):  0.6   -14.1     6.5     N/A    11.6     8.1     5.5   
============================================================================

            VDSL Counters

           Downstream        Upstream
Since Link time = 55 min 25 sec
FEC:      12320      157
CRC:      0      33
ES:      0      31
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 15 minutes time = 13 min 51 sec
FEC:      79      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 15 minutes time = 15 min 0 sec
FEC:      45      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 1 day time = 13 min 51 sec
FEC:      79      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 1 day time = 24 hours 0 sec
FEC:      12357      158
CRC:      534      33
ES:      10      31
SES:      10      0
UAS:      37      27
LOS:      1      0
LOF:      7      0
LOM:      0      0
Total time = 1 days 13 min 51 sec
FEC:      123675      8300
CRC:      1699      437
ES:      32      404
SES:      30      0
UAS:      115      85
LOS:      2      0
LOF:      14      0
LOM:      0      0
======================================
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licquorice

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Re: VDSL Advice
« Reply #19 on: June 01, 2017, 03:31:37 PM »

Looks as though DLM has relented and I'm back up to 39,999 (capped 40mbps).

My Broadband Ping

A drop in connection at around 8:15am suggests something may have been done at the cabinet, although the high ES around that time may have forced the reconnect.  If the latter was the case I would have expected DLM to either maintain or lower the connection speed.

 :)  :) That would be DLM re-syncing your line.
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Tacitus

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Re: VDSL Advice
« Reply #20 on: June 01, 2017, 07:05:59 PM »

:)  :) That would be DLM re-syncing your line.

The high ES and CRCs around that time made me wonder if that was the case but I try to be optimistic and hope someone has done some work to improve the line, which is around 60 years old.   :)

At least the move to fibre should have by-passed the long length of aluminium through the village.
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licquorice

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Re: VDSL Advice
« Reply #21 on: June 01, 2017, 07:14:05 PM »

At least the move to fibre should have by-passed the long length of aluminium through the village.


I very much doubt it, I would expect the aluminium will be on the 'D' side of the cab, not the 'E' side.
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Black Sheep

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Re: VDSL Advice
« Reply #22 on: June 01, 2017, 08:14:50 PM »

At least the move to fibre should have by-passed the long length of aluminium through the village.


I very much doubt it, I would expect the aluminium will be on the 'D' side of the cab, not the 'E' side.

To be fair ..... it's 50/50 whether the Ali is on the E or D side cable, or indeed both ?? Flip of a coin, Licq.  ;) :)
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licquorice

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Re: VDSL Advice
« Reply #23 on: June 01, 2017, 08:52:28 PM »

Interesting, didn't think Ali was ever used on the E side. Thanks for the clarification.
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Black Sheep

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Re: VDSL Advice
« Reply #24 on: June 01, 2017, 09:09:13 PM »

Yeah ...... quite abundant to be honest. Obviously I personally could never equate the amounts ...... but I would humbly suggest there is as much Ali on the E-side cable make-ups, as there is on the D-side builds.  :)
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Tacitus

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Re: VDSL Advice
« Reply #25 on: June 02, 2017, 08:21:23 AM »

At least the move to fibre should have by-passed the long length of aluminium through the village.

I very much doubt it, I would expect the aluminium will be on the 'D' side of the cab, not the 'E' side.

Could be totally wrong of course, but older residents tell me that apart from some 'patching' (their word) nothing much has been done between me and the cabinet.  One of the BT guys who came to fix a neighbour's broadband said there was a long length of aluminium through the village, which correlates with what I've been told about work done during the early 70s when copper prices were high. 
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licquorice

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Re: VDSL Advice
« Reply #26 on: June 02, 2017, 08:33:42 AM »

Precisely, thats what I meant. If the Ali is between you and the cabinet, you will still be using it. The fibre only replaces the cable between the cabinet and the exchange.
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Tacitus

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Re: VDSL Advice
« Reply #27 on: June 02, 2017, 10:57:53 AM »

You guys are obviously more knowledgeable than me so could someone tell me the significance of:

Quote
Actual INP:        0.0 symbols      52.0 symbols

There must have been another resync around 9pm last night which suggests the probs may be due to crosstalk but the new reading is:

Quote
Actual INP:        0.0 symbols      47.0 symbols

which until recently was the long term figure.  What is the significance of the drop in the number of symbols? Does it mean that G.INP is no longer working as hard to stabilise the line?
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WWWombat

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Re: VDSL Advice
« Reply #28 on: June 02, 2017, 12:21:42 PM »

What is the significance of the drop in the number of symbols? Does it mean that G.INP is no longer working as hard to stabilise the line?
In technical terms, the number represents DLM's requirements on the choices made by the modem at sync time. Here it is asking for noise protection to cope with a burst of noise (SHINE rather than REIN) that lasts for 47 symbols.

DSL works at 4,000 symbols per second, so 47 offers protection against a noise burst lasting 12ms. 52 isn't much different: 13ms.

With retransmission, "protection against a noise burst" means: The modem has to set up retransmission so that it can store all of the transmitted blocks for at least 12ms, and then be able to retransmit them after the far end reports they all went missing. On top of that, given that re-transmission usually happens within 1ms of the loss being noticed (or so I understand), it also requires settings to allow blocks to be re-re-transmitted a fair number of times.

The shift from 52 to 47 probably does mean the modem is working slightly less hard. Less memory seems certain.

I guess it also means the maximum jitter that G.INP can introduce is 12ms too.
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Tacitus

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Re: VDSL Advice
« Reply #29 on: June 02, 2017, 04:06:25 PM »

In technical terms, the number represents DLM's requirements on the choices made by the modem at sync time...... [ SNIP]

Thanks for the explanation.Very helpful  :)
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