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[pingles]

Hi,

I've got a new FTTC connection (now with AAISP having used Virgin for about 7-8 years before)- at one point I had a sync speed of around 56Mbps and avg. latency of 11ms but switched over the modem to a Vigor 130 and although its been more stable than the Zyxel VG1312 it has settled with a ~52Mbps sync speed and an avg 15ms latency.

I'm trying to go through the stats to figure out whether I just got lucky a few days ago and whether DLM has kicked in and this is the best I'll see. Any help understanding the stats would be greatly appreciated.

I live about 500m from the cabinet and I think the line length is around 700m (connected via poles). The internal socket is a little old (we moved here a year ago), I wanted it replaced when OR connected but they just activated the old connection and wouldn't install a new socket- just fix the old one.

Thanks!


Stats taken from telnet, line has been synced for just over 3 days (when the modem changed).

Code: [Select]

---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
 Running Mode            :      17A       State                : SHOWTIME
 DS Actual Rate          : 52987000 bps   US Actual Rate       : 15661000 bps
 DS Attainable Rate      : 45049704 bps   US Attainable Rate   : 14939000 bps
 DS Path Mode            :        Fast    US Path Mode         :        Fast
 DS Interleave Depth     :        1       US Interleave Depth  :        1
 NE Current Attenuation  :       20 dB    Cur SNR Margin       :        4  dB
 DS actual PSD           :     7. 7 dB    US actual PSD        :    11. 9  dB
 NE CRC Count            :     5349       FE CRC Count         :       48
 NE ES Count             :     1402       FE  ES Count         :       48
 Xdsl Reset Times        :        0       Xdsl Link  Times     :        1
 ITU Version[0]          : b5004946       ITU Version[1]       : 544e0000
 VDSL Firmware Version   : 05-07-06-0D-01-07   [with Vectoring support]
 Power Management Mode   : DSL_G997_PMS_L0
 Test Mode               : DISABLE
-------------------------------- ATU-C Info ---------------------------------
 Far Current Attenuation :       30 dB    Far SNR Margin       :        4  dB
 CO ITU Version[0]       : b5004244       CO ITU Version[1]    : 434da48c
 DSLAM CHIPSET VENDOR    : < BDCM >

---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
                  Near End        Far End    Note
 Trellis      :      1               1
 Bitswap      :      1               1
 ReTxEnable   :      0               1
 VirtualNoise :      0               0
 20BitSupport :      0               0
 LatencyPath  :      0               0
 LOS          :      0               0
 LOF          :      0               0
 LPR          :      0               0
 LOM          :      0               0
 SosSuccess   :      0               0
 NCD          :      0               0
 LCD          :      0               0
 FECS         :      0            1691 (seconds)
 ES           :   1402              49 (seconds)
 SES          :    339               0 (seconds)
 LOSS         :      0               0 (seconds)
 UAS          :     31            161947 (seconds)
 HECError     :      0               0
 CRC          :   5349              49
 RsCorrection :      0               0
 INP          :      0             230 (symbols)
 InterleaveDelay :      0              26 (1/100 ms)
 NFEC         :    254              32
 RFEC         :     16              16
 LSYMB        :   4203              16
 INTLVBLOCK   :    127              32
 AELEM        :      0            ----


[NEXUS2345]

I think you will find the reason for the lost sync speed is that the Vigor 130 uses a Lantiq chipset, which is known to be less stable than a similarly equipped Broadcom chipset, such as the one in the Huawei Echolife HG612-3B. You are on a Huawei Broadcom equipped cabinet, so I would suggest if possible looking for an HG612 or a ZyXEL VMG series unit on ebay. They should give better stability and improved sync speed on the Huawei cabinet.

[wj66]

Hi pingles
I’m on a ECI cabinet, as a comparison to your stats my line length is approx. 350Mts to the cabinet with an attenuation of 14db but only achieving similar speeds (Lots of crosstalk on my line) your actual rate is higher than attainable and with a snr of 4 db. the chance that if you were to re start the V130 your speed would reduce. You are on fastpath with no interleaving, G.inp is active on your downstream (ReTxEnable set to 1 on Far End)
As you are connected to Huawei cabinet a Broadcom chip modem may improve your connection. I have little experience interpreting the stats there are others on this forum that will help and advice.
John

System up Time 49:16:1
Date Jan 28 2017
Firmware Version 3.8.0_BT

  ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
   Running Mode            :      17A       State                : SHOWTIME
   DS Actual Rate          : 50394000 bps   US Actual Rate       : 15926000 bps
   DS Attainable Rate      : 48792048 bps   US Attainable Rate   : 15615782 bps
   DS Path Mode            :        Fast    US Path Mode         :        Fast 
   DS Interleave Depth     :        1       US Interleave Depth  :        1 
   NE Current Attenuation  :       14 dB    Cur SNR Margin       :        5  dB
   DS actual PSD           :     5. 5 dB    US actual PSD        :     5. 7  dB
   NE CRC Count            :       89       FE CRC Count         :    59525
   NE ES Count             :       19       FE  ES Count         :    33233
   Xdsl Reset Times        :        0       Xdsl Link  Times     :        1
   ITU Version[0]          : b5004946       ITU Version[1]       : 544e0000
   VDSL Firmware Version   : 05-07-06-0D-01-07   [with Vectoring support] 
   Power Management Mode   : DSL_G997_PMS_L0 
   Test Mode               : DISABLE 
  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :       13 dB    Far SNR Margin       :        6  dB
   CO ITU Version[0]       : b5004946       CO ITU Version[1]    : 544eb206
   DSLAM CHIPSET VENDOR    : < IFTN >
  ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
                  Near End        Far End    Note
 Trellis      :      1               1
 Bitswap      :      1               1
 ReTxEnable   :      0               1
 VirtualNoise :      0               0
 20BitSupport :      0               0
 LatencyPath  :      0               0
 LOS          :      0               0
 LOF          :      0               0
 LPR          :      0               0
 LOM          :      0               0
 SosSuccess   :      0               0
 NCD          :      0               0
 LCD          :      0               0
 FECS         :      0            7322431 (seconds)
 ES           :     19            33233 (seconds)
 SES          :      1             126 (seconds)
 LOSS         :      0             144 (seconds)
 UAS          :     34            33985 (seconds)
 HECError     :      0               0
 CRC          :     89            59525
 RsCorrection :      0               0
 INP          :      0             225 (symbols)
 InterleaveDelay :      0              28 (1/100 ms)
 NFEC         :    255              32
 RFEC         :     16              16
 LSYMB        :   4271              16
 INTLVBLOCK   :    255              32
 AELEM        :      0            ----
Vigor> 

[pingles]

Just switched back to the provided Zyxel VMG1312-B10A. I turned off the Vigor 130 while I left the house for a few hours.

Having just turned it back on (its around 5pm):

Code: [Select]


============================================================================
    VDSL Training Status:   Showtime
                    Mode:   VDSL2 Annex B
            VDSL Profile:   Profile 17a
            Traffic Type:   PTM Mode
             Link Uptime:   0 day: 0 hour: 6 minutes
============================================================================
       VDSL Port Details       Upstream         Downstream
               Line Rate:     17.401 Mbps       55.828 Mbps
    Actual Net Data Rate:     17.372 Mbps       55.829 Mbps
          Trellis Coding:         ON                ON
              SNR Margin:        6.3 dB            6.4 dB
            Actual Delay:          0 ms              0 ms
          Transmit Power:        7.6 dBm          12.2 dBm
           Receive Power:       -7.3 dBm         -10.5 dBm
              Actual INP:        0.0 symbols      48.0 symbols
       Total Attenuation:       14.9 dB           22.7 dB
Attainable Net Data Rate:     17.413 Mbps       56.795 Mbps
============================================================================
      VDSL Band Status    U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):  7.8    33.4    48.7     N/A    15.7    39.7    62.1   
Signal Attenuation(dB):  7.8    33.0    47.6     N/A    18.8    39.3    62.3   
        SNR Margin(dB):  6.4     6.4     6.3     N/A     6.4     6.4     6.4   
   Transmit Power(dBm):  0.4   - 9.6     6.5     N/A     8.2     7.7     6.1   
============================================================================

            VDSL Counters

           Downstream        Upstream
Since Link time = 6 min 1 sec
FEC: 2130 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 6 min 35 sec
FEC: 2130 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 33 33
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 15 minutes time = 0 sec
FEC: 0 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 = 6 min 35 sec
FEC: 2130 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 33 33
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Total time = 6 min 35 sec
FEC: 2130 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 33 33
LOS: 0 0
LOF: 0 0
LOM: 0 0
============================================================================



[NEXUS2345]

Those stats look much better. You are back to a sync of around 56Mbps, and have also gained a lot more SNRM, up to around 6.4 on both, so there is slightly more headroom before you lose speed. I would leave it in place. If the issue was the wifi, you could very easily put it in modem only mode and connect it to a more powerful router.

[highpriest]

I'm connected to a Huawei cab and had a really bad experience with a Vigor 130 as well. I only used it for 3 days and my line got permanently banded. It only cleared when I switched ISPs and a reset was performed during the migration. I would highly recommend that you stick with a Broadcom equipped modem/router if your cabinet is a Huawei.

[pingles]

So the connection has been stable for 18d according to MDWS (pingles on there too). Unfortunately it _looks_ like I've been banded: my attainable shows at ~58Mbps down and ~15.7Mbps up. According to MDWS I'm synced at 49000Kbps down, with interleaving at 16.

Any hope for turning the modem off for 30mins+ and then reconnecting to see if it'll jolt it back? 49Mbps speed is alright but it'd be nice to drop the interleaving back to fastpath- error seconds have been reported to be 1 or 0 per day for quite a while now.

Thanks for any advice!

[NEXUS2345]

I would agree that it appears that your line is banded in some form. Your current SNRM of 9dB is the main indicator of this. Low interleaving and INP levels are usually associated with the use of G.INP, which your line has, so I wouldn't be concerned about that.

The only way to get banding removed is to convince your ISP to get an Openreach technician on site to issue a DLM reset request. Be aware however, that this may incur a charge of anywhere from £120 to £180, or the technician may simply refuse to do the reset, as it is common practice to only do a DLM reset after fixing a fault.