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Author Topic: Switched ISP Speed Dropped 10Mbs Interleaving & High Ping  (Read 190 times)

enginerd

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  • Posts: 2
Switched ISP Speed Dropped 10Mbs Interleaving & High Ping
« on: August 16, 2019, 01:22:36 PM »

I'm on an ECI cab and usually have an ECI modem connected, I switched from BT to PlusNet and would normally have speeds of around 74Mbs. After the switch, it dropped down to 62Mbs and my ping has gone from about 11ms to 38 - 60ms. I plugged my unlocked hg612 back in to see what is happening and noticed my DS Interleaving depth is at 1361 max attainable rate is in over 80Mb but I'm only syncing at 69Mbs. Any ideas whats happened?


xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   0
Last initialization procedure status:   0
Max:   Upstream rate = 25441 Kbps, Downstream rate = 80004 Kbps
Bearer:   0, Upstream rate = 20000 Kbps, Downstream rate = 69568 Kbps

Link Power State:   L0
Mode:         VDSL2 Annex B
VDSL2 Profile:      Profile 17a
TPS-TC:         PTM Mode(0x0)
Trellis:      U:ON /D:ON
Line Status:      No Defect
Training Status:   Showtime
      Down      Up
SNR (dB):    6.2       9.5
Attn(dB):    12.2       0.0
Pwr(dBm):   -0.1      -0.1
         VDSL2 framing
         Bearer 0
MSGc:      18      150
B:      51      236
M:      1      1
T:      64      5
R:      12      16
S:      0.0238      0.3771
L:      21528      5410
D:      1361      1
I:      64      255
N:      64      255
         Counters
         Bearer 0
OHF:      1537895      383560
OHFErr:      0      1
RS:      393535204      3444241
RSCorr:      627      13
RSUnCorr:   0      0

         Bearer 0
HEC:      0      0
OCD:      0      0
LCD:      0      0
Total Cells:   314338246      0
Data Cells:   18963303      0
Drop Cells:   0
Bit Errors:   0      0

ES:      0      1
SES:      0      0
UAS:      26      26
AS:      2351

         Bearer 0
INP:      3.00      0.00
INPRein:   0.00      0.00
delay:      8      0
PER:      1.52      6.15
OR:      125.64      202.87
AgR:      69693.75   20203.27

Bitswap:   33/33      0/0

Total time = 39 min 37 sec
FEC:      627      13
CRC:      0      1
ES:      0      1
SES:      0      0
UAS:      26      26
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 15 minutes time = 9 min 37 sec
FEC:      251      4
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:      208      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 = 39 min 37 sec
FEC:      627      13
CRC:      0      1
ES:      0      1
SES:      0      0
UAS:      26      26
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
Since Link time = 39 min 9 sec
FEC:      627      13
CRC:      0      1
ES:      0      1
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
#

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dorzb

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  • Posts: 58
Re: Switched ISP Speed Dropped 10Mbs Interleaving & High Ping
« Reply #1 on: August 16, 2019, 01:57:56 PM »

I'm on an ECI cab and usually have an ECI modem connected, I switched from BT to PlusNet and would normally have speeds of around 74Mbs. After the switch, it dropped down to 62Mbs and my ping has gone from about 11ms to 38 - 60ms. I plugged my unlocked hg612 back in to see what is happening and noticed my DS Interleaving depth is at 1361 max attainable rate is in over 80Mb but I'm only syncing at 69Mbs. Any ideas whats happened?

I've just learnt something from kitz. It looks like your line is in the same situation. :no:

https://forum.kitz.co.uk/index.php/topic,23710.msg400827.html#msg400827

[Moderator edited to trim the verbatim quote of the entire previous message.]
« Last Edit: August 16, 2019, 05:56:08 PM by burakkucat »
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RealAleMadrid

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  • Posts: 95
Re: Switched ISP Speed Dropped 10Mbs Interleaving & High Ping
« Reply #2 on: August 16, 2019, 02:30:15 PM »

@enginerd

I don't think it is a profile problem like dorzb had. It is just that the provider change has caused a DLM reset so the line has gone to interleaved. In this condition the max attainable is over estimated. If you are lucky the line should go back to fast path in a while, days or weeks, who knows. :)  If it doesn't you could try capping the download speed temporarily using the correct modem command, its in some posts on the forum.
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j0hn

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  • Posts: 2523
Re: Switched ISP Speed Dropped 10Mbs Interleaving & High Ping
« Reply #3 on: August 17, 2019, 09:59:53 AM »

The vast majority of users who switch ISP will have an immediate increase in ping/latency with a decrease in speed.

When you switch ISP the DLM (Dynamic Line Management) resets. This enables Interleaving which increases ping by 8ms.
Interleaving also takes roughly 10% of the sync speed.

If the line remains stable this will return as Interleaving will be removed.

The ISP has zero say in this. It happens with most migrations.
The ISP has zero control of the DLM.
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Plusnet FTTC 80/20 -  ECI now Huawei cab
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Zyxel VMG1312-B10A bridged with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin
 

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