New ADSL2+ Cabinet

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DjShadow

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# 36053 18-Jun-2009 16:39

Hey all, Telecom switched on our new cabinet around 5am this morning (went from 6mb to 18mb overnight)
However, we're approx only 20-30 metres from this new Cabinet and I honestly thought the connect speed would be around 23mb, can anyone tell me from the below if we have too much line resistance?

Line Mode	ADSL2+	Line State	Show Time
Line Power State	L0	Line Up Time	00:00:04:26
Line Coding	Trellis On	Line Up Count	1

Statistics	Downstream	Upstream
Line Rate	18818 Kbps	870 Kbps
Attainable Line Rate	21548 Kbps	874 Kbps
Noise Margin	12.0 dB	12.4 dB
Line Attenuation	7.0 dB	3.1 dB
Output Power	15.2 dBm	12.4 dBm

zCelicaDude

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# 226339 18-Jun-2009 17:06

Very weird, perhaps you may have bad wiring / old wiring in your house, are you using a filter in every jackpoint or have you got a splitter installed?

what modem/router have you got?

there is so many variables regarding connection speed that I have just picked some which are common areas for issues like this.

Just a note, I had only a 6mb line sync and about 40 db of line noise, i installed a splitter inside the telecom box outside the house, and ran a cat6 cable from there directly to my adsl router, avoiding all power cables (no interference) ... my sync speed then doubled to 12 mb with the same 40db line noise..

maybe the new splitter caused the massive increase in speed, aswell as having its own cable direct from outside into the modem, gets me thinking either my houses internal wiring is crap, or i had a faulty filter.

DjShadow

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# 226343 18-Jun-2009 17:12

Phone cable into tihs place is around 30 years old old, I'm using a Dynalink RTA1025w plugged into what would be considered the master phone jack. We do have a sky installed jack however but all devices do have filters on them.

Did you run the cat6 cable from the street or the demarc point?

zCelicaDude

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# 226368 18-Jun-2009 18:17

Hey, I ran it from the demarc point, which is the where the main line comes into the house anyhow, no point going to the street as the cable they have in the ground is very well insulted,, filled with gel.. so yeh from the demarc point where u see the telecom wire coated in black. Which suburb are you in?

DjShadow

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# 226370 18-Jun-2009 18:19

am in Nawton Hamilton
I'm quietly wondering how good the sky tech installed the phone line when we got it installed

zCelicaDude

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# 226373 18-Jun-2009 18:22

is there a filter where the sky plug is? u sure u got nothin else plugged in anywhere else? try an isloation test, where the only thing plugged in is the adsl modem/router , unplug all phones, should only have the filter plus modem plugged into the jackpoint. once you have done that, make sure you power off your modem/unpplug it, then wait for it to re sync up... do that and let me know if it is better

cyril7

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# 226406 18-Jun-2009 19:20

Hi, you cannot play beyond the demarc, if the drop line from the street to demarc is bad then you must get Telecom to sort it.

Because Telecom push for a 12dB S/N rather than 7-8dB its quite common that you cannot achieve much more than 19Mb/s, however it will be more stable as a result of the higher noise margin. Orcon and Voda I note set their DSLAMS to target 7-8dB S/N to give higher rates, but lets get real, 19Mb/s is pretty good.

Its quite possible that the 7dB (0.5km) is due to the fact that the cable runs up the street and back down the otherside or some other route than direct, dont forget that in the days of POTS only 7km or more of cable was not out of order to meet performance, so there was no reason to give you the shortest path.

If you want to do yourself a favour, get a new cat5 cable installed from the demarc to modem and a central filter installed, this will bypass any in house wiring issues.

Cheers
Cyril

DjShadow

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# 226418 18-Jun-2009 20:14

Hi Cyril, I would agree with what you are saying there. The original cabinet was across the road and the new one would be 20m from it on the otherside (less chance being hit by a car if it lost control)
I'm guessing the original copper still goes to the site of the original cabinet then onto an extension to the new cabinet, I can understand the weld adding some attenuation

eXDee

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# 226864 19-Jun-2009 21:03

Two things
1) as cyril said, get a central filter, sometimes sky's wiring can be very bad. Back a while ago when we got one installed, before the cabinet our sync almost doubled from ~2200 to ~4000, in a 25 year old house.

2) get DMT Tools V8, and drop your SNR margin to ~8ish, this will increase your sync rate, and your modem should have no problem holding the connection.

Make sure you have the latest dynalink firmware, DMT Tools link is here
Open options, and find 'hidden' or 'testing/expimental' tab, enter you username/password to login the router, then select the blank tab that appears. Drag the slider down to 50% or something, and hit resync (dont touch the other options). This should decrease the nosie margin, try keeping it above 7 ideally.

note if you restart/resync the modem it will reset.