Upstream packet loss on VDSL2

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colinbowern

27 posts

Geek

#147235 13-Jun-2014 07:16

I recently had my 30/10 VDSL2 connection upgraded to 30/30 CIR with Wireless Nation at our apartment in Auckland (Grafton Road between Grafton Bridge and SH1). I have run into a lot of VoIP call quality issues as of late and am trying to isolate the problem with so many factors at play:

Polycom VVX 410 IP Phone --(wired)-- INNBOX v50-u modem --(wired)-- Wireless Nation --(wired)-- pacific cable --(wired)-- voip.ms VOIP provider

Just looking for any thoughts in case someone else has ran into similar issues.

Here you can see there are regular packets being lost - at least at the ICMP level - when running PingPlotter from a wired connection to the INNBOX modem. The IP phone is also wired into the same modem. When I'm on a call it is typically my voice (upstream) that drops or becomes robotic - I have never had an issue hearing audio from the other end.

Here is what I'm seeing on the DSL side from the modem:

Is the INNBOX modem considered decent for the VDSL service in NZ or is there a better option? Any thoughts / advice?

PeterReader

5980 posts

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#1064634 13-Jun-2014 07:16

Hello... Our robot found some keywords in your post, so here is an automated reply with some important things to note regarding broadband speeds.

If you are posting regarding DSL speeds please check that

- you have reset your modem and router

- your PC (or other PCs in your LAN) is not downloading large files when you are testing

- you are not being throttled by your ISP due to going over the monthly cap

- your tests are always done on an ethernet connection to the router - do not use wireless for testing

- you read this topic and follow the instructions there.

Make sure you provide information for other users to help you. If you have not already done it, please EDIT your post and add this now:

- Your ISP and plan

- Type of connection (ADSL, ADSL2, VDSL)

- Your modem DSL stats (do not worry about posting Speedtest, we need sync rate, attenuation and noise margin)

- Your general location (or street)

- If you are rural or urban

- If you know your connection is to an exchange, cabinet or conklin

- If your connection is to a ULL or wholesale service

- If you have done an isolation test as per the link above

Most of the problems with speed are likely to be related to internal wiring issues. Read this discussion to find out more about this. Your ISP is not intentionally slowing you down today (unless you are on a managed plan). Also if this is the school holidays it's likely you will notice slower than usual speed due to more users online.

A master splitter is required for VDSL2 and in most cases will improve speeds on DSL connections. Regular disconnections can be a monitored alarm or a set top box trying to connect. If there's an alarm connected to your line even if you don't have an alarm contract it may still try to connect so it's worth checking.

I recommend you read these two blog posts:

- Is your premises phone wiring impacting your broadband performance? (very technical)

- Are you receiving a substandard ULL ADSL2+ connection from your ISP?

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mercutio

1387 posts

Uber Geek

#1064647 13-Jun-2014 07:30

well speeds of over 10 megabit aren't around in new zealand normally, so your apartment complex must have it's own dslam. it looks like it's a dodgy line, and they're not doing dlm or anything to limit speeds, and there's just too many errors on the line.

the modem itself is probably fine, it looks to be broadcom chipset which tend to sync higher. you're not actually syncing at 30 megabit upload, so you wont' be able to do 30 megabit upload anyway. maybe you should shift back down to 30/10?

colinbowern

27 posts

Geek

#1064653 13-Jun-2014 08:08

mercutio: well speeds of over 10 megabit aren't around in new zealand normally, so your apartment complex must have it's own dslam. it looks like it's a dodgy line, and they're not doing dlm or anything to limit speeds, and there's just too many errors on the line.

My understand is they have fibre to the building, then use the copper run to the apartments. The offering is billed as Cable over Fibre. I have not seen the install in the basement myself so I'm just going on what I'm told. Can you tell me which parts of the xDSL stats are of particular concern so I can raise that with them? Paying $375/month for a 30M/30M CIR connection and I'm hoping that it can at least deliver reasonable quality. :)

mercutio: the modem itself is probably fine, it looks to be broadcom chipset which tend to sync higher. you're not actually syncing at 30 megabit upload, so you wont' be able to do 30 megabit upload anyway. maybe you should shift back down to 30/10?

I was wondering if swapping in a Draytek Viger130 or similar would change things (even was looking at some Cisco 800 series at one point), but from what you are saying that is unlikely to make a difference. What I'm reading from this is by turning up the speed the error rate was turned up as well?

The packet loss is getting worse as the day gets on:

mercutio

1387 posts

Uber Geek

#1064655 13-Jun-2014 08:15

colinbowern:
mercutio: well speeds of over 10 megabit aren't around in new zealand normally, so your apartment complex must have it's own dslam. it looks like it's a dodgy line, and they're not doing dlm or anything to limit speeds, and there's just too many errors on the line.

My understand is they have fibre to the building, then use the copper run to the apartments. The offering is billed as Cable over Fibre. I have not seen the install in the basement myself so I'm just going on what I'm told. Can you tell me which parts of the xDSL stats are of particular concern so I can raise that with them? Paying $375/month for a 30M/30M CIR connection and I'm hoping that it can at least deliver reasonable quality. :)

yeah it'll be copper in the apartment. i imagine you're meant to take it up with wireless nation rather than the apartment complex but it could always be something normal like a faulty jackpoint.

mercutio: the modem itself is probably fine, it looks to be broadcom chipset which tend to sync higher. you're not actually syncing at 30 megabit upload, so you wont' be able to do 30 megabit upload anyway. maybe you should shift back down to 30/10?

I was wondering if swapping in a Draytek Viger130 or similar would change things (even was looking at some Cisco 800 series at one point), but from what you are saying that is unlikely to make a difference. What I'm reading from this is by turning up the speed the error rate was turned up as well?

yeah error rate most likely went up due to them trying to use higher profile on the line.

you could always try a different modem, as some can work better on error prone lines than others. but it's operating at 6.2db snr margin where chorus have margins around 12db.

what you're looking at as far as errors go is errored seconds and severely errored seconds, listed as ES and SES. That's generally specific enough.

colinbowern

27 posts

Geek

#1068986 19-Jun-2014 07:38

Working with the ISP we has the port configuration refreshed at the operator equipment level and that seems to have fixed the issue. I am guessing there was a difference in the running vs. configured values on the port. Packet loss has disappeared and VoIP quality has returned.