Odd drop-off on spectrum

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hio77

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#162219 2-Feb-2015 13:15

So, pulled out my fritz to take a good look at the spectrum and noticed a very sharp drop off

Line is via an ADSL2 Splitter, direct to BT jack, standard phone wiring (installed by chorus years ago)

To me, this drop off looks like something that could be looked into, but then what the cause would be im unsure of, hoping someone who looks at these a lot more might have a fair idea.
A friend did mention it is likely a capacitor in the BT jack but i dont really wanna go digging around in there to check that out till i find what i have done with my punchdown tool.

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PeterReader

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#1227671 2-Feb-2015 13:15

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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yitz

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#1227720 2-Feb-2015 13:38

Reserved for less noise on VDSL on ADSL2+ profiles for short lines perhaps?

What's the change in ADSL2+ sync rate?

hio77

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#1227724 2-Feb-2015 13:44

no change, apart from the fact that i can actually see its there being a fair bit closer.

Reserving for VDSL is an interesting theory, first i have heard of it being a thing.

That is the point that VDSL does sometimes first start seeing a jump although is still within the DS0 band on some lines, comparing to my past vdsl lines it is not so prominent compared to others.

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Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.