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Solution

vDSL Broadband comes to a grinding halt

yeshu26
3: Seeker
3: Seeker

Good Evening

Background:

1: Minimum guaranteed speed for my VDSL broadband delivered my is 20 Megs

2: I was with SKY for over three years and never ever had any performance based issues with them, Now I am biting my fingers for switching to Vodafone.

3: IT  chap here, so dear Vodafone employees/moderators  please treat me with some respect and extend the courtesy of not asking to do ridiculous things like turning on and off the modem-Router, or connecting the RJ-11 cable straight to the master socket as an example.

4: Using a Fortigate DSL Firewall usually but for troubleshooting purpose I have connected back the Vodafone router.

 

Current download speed is 1.72 mbps, and upload speed is 3.92 mbps. I have spoken to your colleagues on total of three occasions, but nothing much has progressed yet.

Output from my modem is appended below for your reference.

Following errors got my attention though..


CRC(near end) [1]
CRC(far end) [11568]

FECS(near end) [0]
FECS(far end) [209278]
Errored Second(ES-L)(near end) [1]
Errored Second(ES-L)(far end) [10585]

As you can see that most of the errors are at the far-end and not near end.

Kindly help

 

Thanks

 

 

Sri

 

 

DSL# diagnose dsl show 2
2nd read[1289]2nd read[0]
HTTP/1.1 200 Ok

VCCs Status
-------------------------------------------------------------------
No Wan Mode Type Status IP Connection Name
-------------------------------------------------------------------
WANIP0 VDSL-PTM Bridge Connected 240.0.0.1 FN_DHCP_ptm0

Gateway Information

DNS Information
Primary
Secondary
MTU 0
Modem Status [SHOWTIME, SYNC[2049]]
Mode Selected [VDSL, 17A]
Power Management Mode [DSL_G997_PMS_L0]
Trellis-Coded Modulation [Enable]
Latency Type [Fast]
Data Rate Downstream [27384 kbps]
Data Rate Upstream [3596 kbps]
Attainable Data Rate Downstream [28533 kbps]
Attainable Data Rate Upstream [3608 kbps]
Interleaver Depth Downstream [1]
Interleaver Depth Upstream [1]
Line Attenuation(LATN) Downstream [30.3 dB]
Line Attenuation(LATN) Upstream [34.9 dB]
Signal Attenuation(SATN) Down [25.3 dB]
Signal Attenuation(SATN) Up [35.1 dB]
SNRM Downstream [4.9 dB]
SNRM Upstream [6.4 dB]
ACATP Downstream [7.2 dB]
ACATP Upstream [12.0 dB]
Superframe [Not available]
LOS Failure(near end) [0]
LOS Failure(far end) [0]
LOF Failure(near end) [0]
LOF Failure(far end) [0]
LPR Failure(near end) [0]
LPR Failure(far end) [0]
NCD Failure(near end) [7]
NCD Failure(far end) [3]
LCD Failure(near end) [7]
LCD Failure(far end) [3]
CRC(near end) [1]
CRC(far end) [11568]
RS Correction(near end) [32]
RS Correction(far end) [32]
FECS(near end) [0]
FECS(far end) [209278]
Errored Second(ES-L)(near end) [1]
Errored Second(ES-L)(far end) [10585]
Serverely Errored Seconds(SES-L)NE [0]
Serverely Errored Seconds(SES-L)FE [14]
Loss of Signal Seconds(LOSS-L)NE [0]
Loss of Signal Seconds(LOSS-L)FE [4]
Unavailable Seconds(UAS-L)NE [36]
Unavailable Seconds(UAS-L)FE [36]
HEC Error(near end) [0]
HEC Error(far end) [0]

DSL #

 

11 REPLIES 11

Jayach
16: Advanced member
16: Advanced member

I won't pretend I understand all those statistics, but 2 questions come to mind.

1. What is your sync speed?

2. Were those taken over wi-fi and what do you get hard wired?

1. What is your sync speed?

 

It is up there in the statistics^^.  But here you go..

Data Rate Downstream [27384 kbps]
Data Rate Upstream [3596 kbps]
Attainable Data Rate Downstream [28621 kbps]
Attainable Data Rate Upstream [3578 kbps]
Interleaver Depth Downstream [1]

 

Sync speed is not the problem here. It only represents the speed for the last mile and is totally irrelevant, if t heproblem lies in the Vodafone Core Network with respect to the associated VLAN with my services. The sync speed of the last mile needs nothing. It all depends where Internet breakout is taking place.

So most likely the packet transits in the following manner:

 

Home-Office --------------- Last mile -------DSLAM------- Vodafone Edge Router------ Vodafone 

-Core Router------ next hop--------- few  other of Routers in between <<>>> Internet Breakout >>>> WWW

Every routing hop adds to packet latency and increased possibility of layer 2 related errors like CRC.

 

2. Were those taken over wi-fi and what do you get hard wired?
Hard wire always. layer one and layer two challenges have been eliminated . The question is irrelevant as I did a speed check from my WAN Router's terminal.

Vodafone moderators/ Technical staff please intervene. Thanks

 

Cheers

Jayach
16: Advanced member
16: Advanced member

Sorry if my query wasn't to your liking but on this forum the only answer you are likely to get from Vodafone is to contact their lovely social media teams.

Hi

If you are switching routers then the connection results could be skewed.

DSL Uptime  43 days, 20 hours, 40 minutes and 19 seconds
Line Quality
  Downstream Upstream
Current Rate75360 kbps19999 kbps
Maximum Rate77598 kbps22528 kbps
Signal-to-Noise Ratio5.3 dB7.2 dB

 

Therefore the long list of parameters you posted may need to be redone.

 

But you definitely should be getting better speeds is my belief.

 

Aye chaps

 

It surely is a simple enough solution, as I work for a local ISP in my city. I only want to "get through" to the right person and explain the problem. For a half decent Network Engineer it is not more than 5-7 minutes of diagnosis and then putting in a a change request to get it sorted.

 

I will keep on pushing, and will certainly keep reading this post and others for new perspectives.

Thank you again.

Jayach
16: Advanced member
16: Advanced member

@yeshu26 wrote:

I only want to "get through" to the right person and explain the problem.

Unfortunately, like all the big (i.e. cheap) ISP's that is almost impossible to do. Their support channels are simply not set up to do it. You would need to go to someone like Zen if you want that kind of support.

Anonymous
Not applicable

Good luck in speaking to a network engineer who works for Vodafone!

 

Lets look at the glaring oddity in your stats though!

I assume you are on superfast 1, because a guaranteed 20Mbps minimum is below the level which triggers Openreach to admit defeat on Superfast 2 and it's equivalents.  But if you are on Superfast 1 we'd expect your connection to be mode 8a not mode 17a (but it shouldn't cause issues) - unless this is simply misreported by the THG3000!

The connection appears to be in fast mode, not interleaved, with FECs (Forward Error Corrections - these ARE corrections not errors) only appearing in any number on the upload path (normal - due to the difference in voltages between what a modem and the cabinet generate).  So that's all good!

 

It tends to lead to the conclusion that whatever is going wrong is somewhere between the cabinet and Vodafone's data centre - though I'm still puzzled by that mode 17a business!

Cheers

One of the quality which married men like myself develop is "patience", and I will keep on telephoning Vodafone every single day of my life until this  is escalated and sorted.

I have discussed some 50 times with their level 1 techs that it is not the last mile which is the issue, but a certain routing issue within the core network. 

 

This connection is all over the map frustratingly. 

@ https://forum.vodafone.co.uk/t5/user/viewprofilepage/user-id/739708

Evie
Moderator (Retired)
Moderator (Retired)

Hey @yeshu26 - I appreciate how frustrating it must be when you don't have a stable connection, so we certainly want to get this sorted for you.

I would advise we run some tests from our end - we don't have access to those systems or account over the forum so please drop us a message on social media with a link to this forum, your forum username and your Vodafone landline/account number.