Bad VDSL down attenuation

Forums › Spark New Zealand (including Skinny and BigPipe) › Bad VDSL down attenuation

kickinr32

5 posts

Wannabe Geek

#130995 4-Oct-2013 18:28

Hey Guys.

I've just had my VDSL installed today and the speed has increased over ADSL2, however I feel as if I was jibbed on the install. The tech didn't put in fresh cat5/6 cable from the ETP to the VDSL jackpoint, and after comparing my attenuation compared to other folks on this forum who have VDSL, mine seems mighty high, and I'm pretty sure I live within 400-500m of the cabinet. I know for a fact that I'm not going to get any better speeds until I get this issue sorted. Are any of the advanced telecom broadband peeps able to sort this out?

These are my line stats:

Link Information
Uptime: 0 days, 2:32:35

DSL Type: ITU-T G.993.2

Bandwidth (Up/Down) [kbps/kbps]: 8,245 / 27,813

Data Transferred (Sent/Received) [B/B]: 0 / 0

Output Power (Up/Down) [dBm]: 7.8 / 13.5

Line Attenuation (Up/Down) [dB]: 45.6 / 20.2

SN Margin (Up/Down) [dB]: 11.9 / 12.3

System Vendor ID (Local/Remote): TMMB / ----

Chipset Vendor ID (Local/Remote): BDCM / IKNS

Loss of Framing (Local/Remote): 9 / 0

Loss of Signal (Local/Remote): 2 / 0

Loss of Power (Local/Remote): 0 / 0

Loss of Link (Remote): -

Error Seconds (Local/Remote): 14 / 0

FEC Errors (Up/Down): 387 / 7,831

CRC Errors (Up/Down): 1 / 8

HEC Errors (Up/Down): 0 / 156

PeterReader

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#908042 4-Oct-2013 18:28

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?

I am the Geekzone Robot and I am here to help. I am from the Internet. I do not interact. Do not expect other replies from me.

Batman

Mad Scientist
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#908053 4-Oct-2013 18:29

just wondering - how does one know whether tech put a cat5/6 cable? if he did run a cable that's presumably the cat5/6 cable?

l43a2

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#908054 4-Oct-2013 18:30

you mite be pretty sure its 500m but that would be by road etc and in a logical path, phone lines dont follow logic.

kickinr32

5 posts

Wannabe Geek

#908064 4-Oct-2013 18:54

I understand that phone cables may not always go straight, however if what I've been reading is true on other websites there is an attenuation cut off for VDSL pre qual checks with some places quoting 10.5 and others 12.5 as the cut off. With mine being at 20 I'm figuring there might be a problem with the internal wiring.

hio77

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Lizard Networks

#908069 4-Oct-2013 19:06

the prequal isnt exact to what you will see at vdsl frequency. generally it will be about 2~3db higher.

call telecom, inform them the install was not up to standard straight away.

any chance your place is a rental? with my bad install i argued this enough to get a apparent "official" response from chorus previsioning in-which they aren't meant to run cables unless specified in rental proprieties (this is something that i know for a fact is hogwash, announcement clearly states cat6 IIRC..)

did they just lazily hang the splitter outside of the jack-point too?

out of curiosity, what area are you in? who were the contracting installers that carried out the job for chorus?

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l43a2

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#908070 4-Oct-2013 19:06

kickinr32: I understand that phone cables may not always go straight, however if what I've been reading is true on other websites there is an attenuation cut off for VDSL pre qual checks with some places quoting 10.5 and others 12.5 as the cut off. With mine being at 20 I'm figuring there might be a problem with the internal wiring.

your attenuation and line stats are similar to mine: my line length is around 680m according to chorus.

this is with Ethernet(cat6) running from the ETP

Bandwidth (Up/Down) [kbps/kbps]: 8,563 / 25,925

Line Attenuation (Up/Down) [dB]: 46.3 / 19.8

kickinr32

5 posts

Wannabe Geek

#908072 4-Oct-2013 19:12

I think he was from visionstream. The house I live in would be roughly 10 years old. So the cabling to the VDSL jack point is probaly not up to specification. I live in Takanini

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hio77

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Lizard Networks

#908073 4-Oct-2013 19:13

kickinr32: I think he was from visionstream. The house I live in would be roughly 10 years old. So the cabling to the VDSL jack point is probaly not up to specification. I live in Takanini

very common pattern by the name of vsionstream recently..

sounds like the tech has tried to cut corners wherever possible.

what was your attenuation like on adsl?

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Yyrael

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#908074 4-Oct-2013 19:14

kickinr32: I understand that phone cables may not always go straight, however if what I've been reading is true on other websites there is an attenuation cut off for VDSL pre qual checks with some places quoting 10.5 and others 12.5 as the cut off. With mine being at 20 I'm figuring there might be a problem with the internal wiring.

The attenuation we work with is almost always different to the attenuation you will find at your address. If you like PM me your address and I'll give you the line stats for it as we test them.

All VDSL connection and wiring orders require the installation of:
• A VDSL splitter
• A dedicated DSL RJ45 jack for the VDSL modem
• Cat 6 cabling from the DSL leg of the splitter to the dedicated RJ 45 jack
• Connection of the legacy wiring to the phone line of the splitter

So if you feel this has not been completed we can certainly look into it for you.

plambrechtsen

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#908078 4-Oct-2013 19:19

One other thing to be aware of.

Your ADSL Attenuation may be 10 or so and after VDSL it typically doubles or times 2.5. So it sounds reasonable to me.