Tandy DSL twisted pair cable.

Just wanted to let you all know that I have purchased and tested the Tandy High Speed RJ11 DSL Cable 0.5m and over the last 5 hours alone the downstream has lifted from 72 to 75.5 and the upstream have gone from 18 to 18.70.
My reason for the purchase was not to increase my speed but to protect my BRAS profile from being damaged by the standard, non-twisted dsl cable that comes with the home hub 5.
This is Suitable for ADSL, ADSL2, ADSL2+ and VDSL (FTTC).
A good investment for 2.99+PP.

yep I got that from adslnation 0.5m high speed rj11 cable as I remember bt engineer say to me last time two years ago that he like my cable and adslnation faceplate.

Hi,

I live 1000 Meters away from my FTTC cab and currently get 23Mbps. Do any of you think this cable will make a difference in speed from what I currently get from this distance I am from my FTTC cab?

Thanks

yes it will make difference. My new cable had increase speed by 3Meg more. Buy it.

OK thank you, I will buy one.

U won't regret it. Good reviews here: http://www.tandyonline.co.uk/review/product/list/id/...

LOL@adslmax. BUY IT NOW. It will make a difference as a standard cable allows interference to run into the cable. The tandy cable is twisted and rejects the [censored] so you should get better speeds. adslmax might be able you to advise on a new face plate if you post what you have at the min.

I guessing the 1 meter version will still be as good? As a 0.5m wont be long enough.

Also I have a normal BT Opnereach VDSL2 faceplate http://phil.lavin.me.uk/wp-content/uploads/2012/02/f...

Edited by deleted (Wed 15-Jan-14 21:09:37)

the shorter the better but it would not hurt that much.

Short cable is best 0.5m is better

Yeah, I was measuring the distance between the fibre modem and face plate earlier and it was 0.6m. But I cant really make it 0.5m due to what my modem is placed on. So I will have to go for as I said in my last post for the one meter version.

In reply to a post by Computerman142:

I guessing the 1 meter version will still be as good? As a 0.5m wont be long enough.

Also I have a normal BT Opnereach VDSL2 faceplate http://phil.lavin.me.uk/wp-content/uploads/2012/02/f...

Mine new version mk2 here: http://s5.postimg.org/du8p0s8br/index.jpg The MK2 is much better for RF filter for Fibre

I had a look at that the other day when I saw it on one of your posts. so I am guessing that both the 1 m cable and MK2 faceplate will put my speed up to something like 26-28meg?

adslmax did you get any boost with the adslnation faceplate. Wondering whether it would be better than the Opnereach VDSL2 faceplate

In reply to a post by noppix1:

Just wanted to let you all know that I have purchased and tested the Tandy High Speed RJ11 DSL Cable 0.5m and over the last 5 hours alone the downstream has lifted from 72 to 75.5 and the upstream have gone from 18 to 18.70.
My reason for the purchase was not to increase my speed but to protect my BRAS profile from being damaged by the standard, non-twisted dsl cable that comes with the home hub 5.
This is Suitable for ADSL, ADSL2, ADSL2+ and VDSL (FTTC).
A good investment for 2.99+PP.

Tandy? that is a name i have not heard off for ages.

Before on adslnation faceplate:

sync: 17559k snr: 3.1dB line att: 30.5dB CRC errors (24 hours): 1077

New on openreach mk2 faceplate:

sync: 17615k snr: 3.1dB line att: 30.5dB CRC errors (24 hours): 15

In reply to a post by zyborg47:

In reply to a post by noppix1:

Just wanted to let you all know that I have purchased and tested the Tandy High Speed RJ11 DSL Cable 0.5m and over the last 5 hours alone the downstream has lifted from 72 to 75.5 and the upstream have gone from 18 to 18.70.
My reason for the purchase was not to increase my speed but to protect my BRAS profile from being damaged by the standard, non-twisted dsl cable that comes with the home hub 5.
This is Suitable for ADSL, ADSL2, ADSL2+ and VDSL (FTTC).
A good investment for 2.99+PP.

Tandy? that is a name i have not heard off for ages.

LOL I was thinking that but they are selling the adslnation stuff now.

In reply to a post by zyborg47:

Tandy? that is a name i have not heard off for ages.

It was overtaken former name as Adslnation here: http://www.domesday1986.com/company/index.php

he only sold it to start VDSL Nation

lol. I was surprise that Tandy doesn't have any VDSL faceplate yet.

Thanks for the info on the plate as my sister has ADSL running at 1 meg.
So there are no ADSL plates on tandy. I have not had a look yet.

I brought my VDSL MK2 faceplate from ebay: http://www.ebay.co.uk/itm/MK2-Original-Genuine-BT-Op...

Mine before was adslnation faceplate (for ADSL/ADSL2+) http://s5.postimg.org/aadkjhquf/xte_2005.png and plus this cable 0.5m: http://s5.postimg.org/ipyjn94br/pro_0_5m.png

Edited by adslmax (Wed 15-Jan-14 21:50:53)

In reply to a post by adslmax:

I brought my VDSL MK2 faceplate from ebay: http://www.ebay.co.uk/itm/MK2-Original-Genuine-BT-Op...

Mine before was adslnation faceplate (for ADSL/ADSL2+) http://s5.postimg.org/aadkjhquf/xte_2005.png

Thats the one I got. Did you see any increase with this one?.

Yes it does increase speed. Also can hold SNR at 0.2dB for 72 days! I remember when BT Engineer come two years ago and he say that cable and adslnation faceplate is excellent condition for ADSL2+

Nice SNR result. unable to find my SNR as i`m on the home hub 5. Getting a HG612 from ebay as the home hub is blocking my CCTV from hitting the net, Ports forward, DMZ, Still no joy but the IP cameras get out just fine. Just got to pick router thinking ASUS.

OK thank you, I will buy one.

You'll know who to complain to when it makes no difference.

In reply to a post by Zarjaz:

OK thank you, I will buy one.

You'll know who to complain to when it makes no difference.

I can't gaurantee it depend on his line quality! But, as far as I am aware it should increase his speed. I shall held no responsible if his speed isn't increase.

Edited by adslmax (Wed 15-Jan-14 22:32:33)

If you replaced SHOULD with MAY more people might nod their heads

The benefit from a short twisted pair cable varies greatly

On ADSL2+ with O2 LLU I found an ADSLNation faceplate consistently (20-30 tests) lost me sync speed by a couple of hundred bps compared to most of the half dozen "came with modem" dangly filters I had, and the posh top ADSLNation modem >> filter cable made no difference whatsoever.

The reduction in CRC errors is significant. The difference in speed really isn't.

It's interesting though, I have just received a Mk2 Openreach faceplate and will be trying it soon.

If you replaced SHOULD with MAY more people might nod their heads

Indeed, Mr.S.

My line quality is pretty good as far as I can tell, it never disconnects and it stays at a constant 23mbps most of the time and if does decrease its only to 22.7mbps. It used to be worse when I had the aluminium cable but now I have replaced it has been good ever since. Also there is no noise on the line. I haven't done a quiet line test but when I press the dial button there is no odd noises with the dial tone. I cant get stats to show you if my line is performing well, as I have the ECI modem and I don't want to open it up and and hack it that way.

You should get a HG612, off eBay, not only will you be able to monitor things you might get a speed increase. I've seen a post in the last few days that said they had seen several long lines sync faster on the HG612 with the latest firmware.

In reply to a post by R0NSKI:

not only will you be able to monitor things you might get a speed increase. HG612 with the latest firmware.

I have been wanting to monitor my line for a while and to see what my downstream and upstream speeds are. If I get one do you think it will be best to get unlocked one from eBay or a normal locked one and unlock it my self? and if it best to do it myself where shall i go about downloading the firmware from?

Anyway I ain't quite sure what to do, as the suggestions I got from everyone on here (which by the way are very helpful) are all different things like a MK2 faceplate new DSL cable and a modem. I'm not sure if I should get all or just one of the three like the modem or faceplate?

I suggest that the time taken to do a basic QLT is not significantly more than listening to the Dial Tone, which may be covering up problems.

And the QLT can reveal a lot more, that is why it is available.

What number do I dial for quiet line test, is it the same with all service providers in my case TalkTalk? Also do I have to plug my phone in the test socket or can I just run it as it now?

Usually 17070 option 2. The message you hear varies by (wholesale) supplier.

It's OK to test initially with a DECT or corded phone into the normal socket. Only if there is noise then do you need to try the test socket. If there is still noise with a DECT base station in the test socket, then you need corded.

Thanks RobertoS

I will try it out and see what happens

Usually 17070 option 2. The message you hear varies by (wholesale) supplier.

If the OP in question is on full TT LLU (I guess he must be) then the option you mention, isn't an, err, option.

Experience has showed that with FTTC, you don't get the classic 'hiss' on an HR fault as you do with ADSL.

Do you mean the quiet line test isn't there on TT, or that 17070 goes straight to it?

T'aint there Bob. Just the announcement of the DN if it's not withheld.

[censored]

replacing the cable is negligible

To expand on RobertoS's answer, on SKY it is also 17070; but Option 4.

As usual with that type of service, a list of Options are read out; and you select whichever is appropriate.

Some Options on the BT version are effectively "password protecred"; but the QLT is not protected.

I have it in my phone's directory, although I remember the number readily enough.

In odd moments about once per week, I carry out that first level test as RobertoS has described - only ifI hear something untoward, would I resort to using the Test Socket and working back.

Edited by deleted (Thu 16-Jan-14 19:20:29)

In reply to a post by Zarjaz:

T'aint there Bob. Just the announcement of the DN if it's not withheld.

Makes sense for things to be missing at those prices

I just done some reading up about it after reading the new posts ( i haven't tried the quiet line test yet) and it turns out like Zarjaz says, there isn't a quiet line test available on TalkTalk. http://www.talktalkmembers.com/t5/Home-Phone/Quiet-l...

So what do any of you think about buying a hg612 modem or MK2 faceplate or tandy cable?

TBH you don't need a quiet line test option, just pick up the phone and dial 0. When the dial tone disappears you will hear.... nothing.

In reply to a post by Computerman142:

In reply to a post by R0NSKI:

not only will you be able to monitor things you might get a speed increase. HG612 with the latest firmware.

I have been wanting to monitor my line for a while and to see what my downstream and upstream speeds are. If I get one do you think it will be best to get unlocked one from eBay or a normal locked one and unlock it my self? and if it best to do it myself where shall i go about downloading the firmware from?

Anyway I ain't quite sure what to do, as the suggestions I got from everyone on here (which by the way are very helpful) are all different things like a MK2 faceplate new DSL cable and a modem. I'm not sure if I should get all or just one of the three like the modem or faceplate?

For what it would cost I would try all three. You may see some improvement, or you may not, but unless you try you will never know.

Unlocking the HG612 is very easy, there can be a few bits that can catch you out but you'll find plenty of help on the forums if you run into problems.

There is an unlocking guide here,look in the menu on the righthand side of the page, but don't use the firmware from there as it is now out of date and BT will over write it. There was an update in October, and it was this update that seems to have improved things for a lot of people, but for a few it's made things worse. This update also removed the modem webpage (GUI), but that can be restored.

You'll find a link at the bottom of this post on kitz to download the latest firmware files, if you want the GUI version it's in the experimental folder, but plenty of people have used it. You'll also find a lot of info on the Kitz forum, well worth a read.

Hope that helps.

In odd moments about once per week, I carry out that first level test

Really ? Isn't that a little OTT ?

Very true, except that on the TT service you won't get a very long nothing before a voice informs you to hang up and try again, or some such.

He does say in "odd" moments .

You can excuse the lack of a quiet line test I guess, but it's the other more important stuff I'd worry about doing without.

In 'odd moments' theres tea to be drunk, books to be read, telly to what, can't say I ever think, 'I've nowt to do for a mo, I'll just go do a quick quiet line test'

Less than 1 minute a week?

With a new estate of 400 houses going up beyond me, thus implying the possibility of physical interference with the existing copper cabling; compounded with an FTTC cabinet going in, almost right outside my house?

The FTTC cabinet being directly on the route of the main 50 year old copper cables; and a new 100-pair link about 50 yards long to the PCP, 45 yards being through the same original ducting?

As the actual fibre has not yet been blown in, we haven't had the final linking in the PCP of individual FTTC connections.

===================================

Regarding dialling "0" in place of a proper QLT, does anyone know whether it is a good substitution?

Thanks R0NSKI, that was very helpful.

Sorry I haven't replied in few days been a bit busy.

I have found a Huawei HG612 on eBay, is there a revision I should go for? As when I read up about the modem, there was a few versions. Does this modem look good?: http://www.ebay.co.uk/itm/BT-Openreach-EchoLife-HG61...

I am also going to get the MK2 faceplate same as adslmax has and the Tandy DSL cable.

That is the 3B version which I believe is the latest version, it also has the later white power supply.

See the link below for some more info.

http://forum.kitz.co.uk/index.php?topic=11721.0

Ok, so I think that is right one to go for. I read that it has a Broadcom chipset, does that mean I can snr tweak fibre optic or does that not work?

That doesn't work with FTTC.

And is specifically banned by Openreach .

I did try it before I knew that. The results were almost unpredictable, except that they were nearly always worse than not interfering.

Edited by RobertoS (Sat 18-Jan-14 21:26:16)

In reply to a post by Computerman142:

Thanks R0NSKI, that was very helpful.

Sorry I haven't replied in few days been a bit busy.

I have found a Huawei HG612 on eBay, is there a revision I should go for? As when I read up about the modem, there was a few versions. Does this modem look good?: http://www.ebay.co.uk/itm/BT-Openreach-EchoLife-HG61...

I am also going to get the MK2 faceplate same as adslmax has and the Tandy DSL cable.

Mine had arrived today new Openreach Modem B3 version HG612 (brand new box) brought it off ebay £19.99 with free P&P. However it locked, I had managed to unlocked it and set up ADSL2+ and testing out via my Netgear DGND3700v2 and it all worked out well. So, I keep that unlocked modem for FTTC coming shortly. I also disabled QoS on the openreach modem to increase upstream on FTTC.

http://s14.postimg.org/geql4se2p/20140118_223442.jpg

Edited by adslmax (Sat 18-Jan-14 22:50:09)

When I started looking for a modem on eBay I wanted it to be new but I couldn't find one.

Was the seller you bought it off, listing the product to have more than one available? if so, please could you link me to it?

If I cant get a new one I will probably buy the second hand one and unlock it if it isn't already. When I get one, there will be no point disabling QoS on the modem as my upload is capped at 1.9Mbps. I have no idea why TalkTalk decided to do that.

Here's a couple listed as new, if they have the white power supply they should be the 3B unit, but may be worth sending a message to verify.

www.ebay.co.uk/itm/191039020187
www.ebay.co.uk/itm/161195815716

In reply to a post by Computerman142:

Was the seller you bought it off, listing the product to have more than one available? if so, please could you link me to it?

There is only two left but it all sold out pretty quick. I let u know when he get some more (brand new B3 model)

Ok, Thank you

Edited by deleted (Sun 19-Jan-14 18:17:01)

so has anyone bought this and noticed a significant increase

I am maxed out at 79999/20000 on fibre so I dunno if it will work

It has probably been said else where. However, a decent cable might give a very noticeable although not significant improvement; it may also give no improvement at all. It depends on te external noise environment.

In reply to a post by Stanman_24:

I am maxed out at 79999/20000 on fibre so I dunno if it will work

Well it will work, but it obviously won't give you any speed increase!

In reply to a post by Stanman_24:

so has anyone bought this and noticed a significant increase

I am maxed out at 79999/20000 on fibre so I dunno if it will work

should be 80000/20000 lol

Happy now,

Just got a HG612 today and I have unlocked it. It increased the speed from 23mbps to 25.1mbps which is good. Now just waiting on the MK2 and DSL cable and it will be at my guess 28mbps.

That's good to hear it. I had ordered BT Home Hub 5 off ebay. Should be with me tomorrow. I rather all in one wireless router BT Home Hub 5 will be much better than using both BT Openreach HG612 plus my netgear router.

In reply to a post by Computerman142:

Happy now,

Just got a HG612 today and I have unlocked it. It increased the speed from 23mbps to 25.1mbps which is good. Now just waiting on the MK2 and DSL cable and it will be at my guess 28mbps.

Make sure u disabled QoS on the HG612 to increase your upstream speed

IO am on TalkTalk's 40/2 so I can only get 1.9 maximum according to TalkTalk on that package so it wont make any difference unless I upgraded to the 80/20?

Do these stats look good?

Downstream Upstream
Attainable rate (kbit/s) 29692 6115
SNR margin (dB) 5.7 12.8
Line attenuation (dB) 24.3 0
Output power (dBmV) 11.6 4.4

Statistics
Help

Path 0
Path 1
Downstream Upstream Downstream Upstream
Line rate (kbit/s) 26576 2000 0 0
CRC errors 4831 0 0 0
FEC errors 107 4 0 0
HEC errors 1054 0 0 0

Edited by deleted (Wed 22-Jan-14 20:58:19)

The stats suggest you could get 6115 Kbit upstream if you weren't capped at 2000 by your talktalk package.

Do they not offer a 40/10 package? That would be better for you.

Attainable rate (kbit/s) 29692 6115

Nope just medium and large which is the 80/20

No they don't, I wish they did or them to change to 40/10 in the future. But knowing TalkTalk that probably wont happen. I might switch to plusnet when the contracts up as you seem to get 80/20 for the same price as I am paying now for 40/2.

In reply to a post by Computerman142:

so I can only get 1.9 maximum according to TalkTalk on that package so it wont make any difference unless ...

Note that it isn't the sync speed that is affected by the QoS setting, but is the upload speed that can be achieved.

On my 20Mbps sync, turning QoS off allowed upload speeds to increase from around 17.5Mbps to 19.1Mbps, while sync speed stayed the same.

Whatever is causing the speed restriction, it seems to be internal to the modem. Perhaps some artefact of the way it queues packets when QoS is turned on.

Try it...

The speed restriction is what TalkTalk put on the up to 38mbps package so it is everyone who has it will only be able to achieve 1.9mbps upload maxiumum. I disabled QoS but it didn't make a difference.

I got my MK2 faceplate and DSL cable today. The MK2 faceplate went to 26Mbps but soon as I plugged the tandy cable in it went down to 24Mbps. I think the DLM has noticed, and reduced my speed as the line attenuation has got higher. Oh well I will have to wait until the DLM decides to speed me back up again.

The length of cable from faceplate to modem/router has a direct effect on d/l speed. I have recently changed the cable and found the shorter one (50cm) is easily 3Mbps better than the same cable type which was 2Mtrs long. I actually cut and re-terminated the old cable simple to tidy things up a bit with the surprise result.

Edited by deleted (Thu 23-Jan-14 18:22:27)

The cable from tandy was measure as 0.50m. Computerman142 (it sound like DLM will working it out because of your faceplate and cable change) allow it for couple of days it will improved. Keep on eyes on your CRC errors on the BT Openreach modem line stats.

Edited by adslmax (Thu 23-Jan-14 18:29:46)

Why I never thought of making my own cable is totally beyond me as i have the plugs(in the bottom of the shed) and the crimps. I think I will order some expensive copper cored cat 6 and see what the results are.
Have you tried using twitted pair cable or did you chop down the standard flat one. The twisted cable will only have any benefit if you have interference making its way into the cable to start with, Though, In a modern home it would be a high possibility especially if you have seen positive results just by chopping it down in length.

I would have thought the noise rejection given by the twisted pair is the main advantage of this cable, a secondary consideration would be the thickness of the copper. I have just replaced mine with some from connektgear.co.uk and the SNR improvement is immediately apparent.

Totally agree with you there and the thicker copper will present a lower resistance even more so if it is multi strand.

Thanks adslmax, yes I have been keeping an eye on it since I plugged the cable in earlier there has been a lot less errors. BTW I have the 1m cable as the 0.5m wouldn't reach and I cant really move it around. The only thing I could is wall mount but I don't want to do that.
downlaod upload
CRC errors 114 0 0 0
FEC errors 15 7 0 0
HEC errors 17 0

You don't want to be using multi strand stuff.

When you remove the DSL cable from modem and replace it with Tandy twisted pair your are going to sync higher or lower depending on how many error's the DLM has seen since the last re-sync, you can't just point this down to DSL cable you need look at the long term stats to see if it was the cable or just because of a forced re-sync.

Where did you get that idea from? Sounds like rubbish to me.

As a RF engineer I can see that a cable that rejects interference at a passive level will have a benefit.
The alien signal will need to be causing a problem and be present in the same amplitude at the time of both testing a twisted and non twisted cable .
The problem with radio waves/RF is that it attaches its self to a cable or any other metallic object and will bounce up and down the cable/object causing harmonics and this is what causes the host signal to be distroyed. Once the harmonic/s hits a desired frequency that matched the wave length of the object the signal is allowed to escape.
The basis of a twisted cable is that the injected/alien signal is not allowed to be reflected up and down the cable destroying the host signal.
When an alien signal is injected into a twisted cable the following happens.
On the first twist the signal couples to the other cable in the twist but in an opposite phase, On the next twist the two signals meet but are in opposite phase to one an another. The laws of RF is that equal (same frequency) and opposite( the same signal in an opposite phase) will cause cancellation.
The alien signal is destroyed by the laws of physics.

I have worked designing military vehicles using twisted cables and the vehicle have been test by MIRA and passed harsh EMI testing.
The twisted cable is not a maybe or a theory it is a hard fact. cat5 cat 6 in IT use it. In vehicles Canbus and LIN use it.

It works!

Post deleted by noppix1

In reply to a post by RobertoS:

Where did you get that idea from? Sounds like rubbish to me.

I have to agree! An uneducated guess!

In reply to a post by Zarjaz:

You don't want to be using multi strand stuff.

The most desired Cat6 cable is multi strand, The best RF cable is multi strand. Would you care to share the science.(Other than its hard to crimp).

I did not mean this to be aggressive lol

Edited by deleted (Fri 24-Jan-14 01:14:19)

In reply to a post by noppix1:

The best RF cable is multi strand. Would you care to share the science.(Other than its hard to crimp).

Are they?

Have a look at the cables feeding cellular base stations, or satcom antennas ... That tends to be Andrews Heliax and that is certainly not multistrand!..

No its not multi strand its twisted feed. But we are now talking about high spec sat up links. nothing to do with consumer kit.
As you all can see from this link.
http://www.thedxshop.com/andrew-heliax/ava6-50-cable...
This stuff is used to kill harmonics within the cable due to the high power being used and will present the host with a clean(cleanest possible) signal.

So from a consumer prospective the multi stand is still the best method.

You also forgot to mention that the power needed to use the Andrews Heliax coax is excessive, heavy on loss and would be useless in low power applications. The cable is also useless in a receive only situation due to the sensitivity loss on the twist.

Even there solid cable applications, although good for high power transmitting applications where reflection is not an issue the design of there intent use is high power transmission only and its still useless as a receiving cable.

I have used this cable in many high power situations.

I fail to see your intent with your statement.

Edited by deleted (Fri 24-Jan-14 02:40:50)

In reply to a post by noppix1:

The most desired Cat6 cable is multi strand,

Actually, the most desired cable isn't multi-strand. Not exactly...

Here's the science bit... (well, the engineering bit)

Ethernet cable comes in both varieties - multi-strand and single-strand, but always with twisted pairs.

The multi-strand variety is used where flexibility is required - so is invariably seen in patch cables. Consumers usually see this kind of cable because they tend to plug computers into routers directly, using this kind of cable. Consumers don't yet have comms rooms in their houses, with racks of RJ45 ports.

The single-strand, or solid, variety is nowhere near as flexible (as well as being hard to crimp connectors onto), so isn't used for patch cables but is used for in-building cabling within walls, ceilings and floors, with the cables routing back to racks. When you see an ethernet connector in a wall, it will usually be wired at the back with solid cable, which tends to use push-fit auto-strip krone connectors.

Both types should offer the same noise rejection because of the twists. However, multi-strand patch cable loses more signal because it has a higher attenuation.

The difference in capability is seen in the specs for Ethernet itself. Multi-strand patch cable is only recommended for a maximum of 30 metres. Ethernet itself allows for a maximum distance of 100 metres, with 90 metres of solid-core plus 5m of flexible multi-core at either end.

So the most desirable cable for keeping the signal intact is actually the solid core one, because it gives you the least attenuation loss. However, it isn't the most desirable in all circumstances, such as when you want flexibility.

Those arguments are all based on Cat 6 (or cat 5 or 5e) carrying ethernet, but they don't really change when you stick a slightly different connector on and carry DSL signals instead.

I was talking about multi strand cable being used in the situation of what would be a short patch lead. I.E a short dsl cable.
I have to agree with most of the points in your post. My main and only disagreement would be the lengths you have quoted as this seem to come down to the quality of the conductor used as shown in the following spec sheet for cat6.
http://docs-europe.electrocomponents.com/webdocs/10c...

As you can see the quote from this manufacturer is 60M and whilst the attenuation is slightly higher the inductance would be much lower but now we are going down another route and totally off topic capacitance/inductance would never be a concern when it comes to household Ethernet or short runs of DSL, Well not for a consumer.

I restarted my router (not the modem) yesterday at around 3 pm, due to thinking there was someone on my network. It re sync at 25.25Mbps. I have been monitoring how many errors for the past day and it seems to be a lot. Is this normal or this cable or something not working properly?

Line rate (kbit/s) 26809 2000 0 0
CRC errors 69124 0 0 0
FEC errors 1254 16 0 0
HEC errors 15813 0

And counting, it seems to rack up the errors pretty quick, mainly when I aint doing anything on the net

not at all rubbish when you remove the DSL cable when the FTTC modem is on this will cause a re-sync and the DLM does not like abrupt dissconection on your line which may sync much lower, so when you replace your DSL cable remember to turn of the FTTC modem first and then replace the DSL cable and then turn on the FTTC modem.

Edited by deleted (Sat 25-Jan-14 21:23:37)

YMMV

You are the first person I have seen suggest any such thing on these forums since the day FTTC was introduced. Odd; that.

We all of course know about the inadvisability of doing the same thing a few times in rapid succession. That is a different matter.

(Edit - actually, removing the DSL cable while the VDSL2 is connected does not cause a re-sync. It causes a loss of sync due to a sudden disconnection. Your method does not avoid the sudden disconnection, nor the loss of sync. ).

Edited by RobertoS (Sat 25-Jan-14 22:17:14)

No worrys it just something you will find out by yourself in due course

If it were true, I would have discovered it long ago.

Try again .

Also, see this post.

Actually, it turns out that DLM in FTTC is considerably more immune to suddenly dropping sync in this way.

It is much better to power-down the modem first, of course, as the DSLAM can detect the "dying gasp" bits in the final frames sent from the modem. However, we just don't get reports from frustrated users that they accidentally triggered DLM from any sort of disconnection.

If you'd been here a while, you'd know that we already know this.

_{Edit: The important bit, of course, is powering down the modem before removing the DSL cable. Powering it down only before plugging the cable back in is pointless.}

Edited by deleted (Sat 25-Jan-14 23:17:08)

As someone who, in the course of their work, will knowingly cause multiple disconnections on an FTTC or indeed ADSL circuit in a short space of time, I can say that what you suggest is poor advice.

I always power down on my ADSL2+ router before change the cable / faceplate myself. As the DLM haven't trigger downgrade but instead increase my sync rate with a nice speed.

Sorry to keep the post going I am wondering what a good SNR would be VDSL2

It is currently 4.5db or around that and it only manages to get as high 6.6 in the day and that only for about half an hour and them comes down again.

I been reading and apparently the higher the better?

But i'm not sure what a good SNR for a line of my length or whether it means I have a bit noise on my line?

When I had ADSL2+ with the aluminium cable I used to get a SNR as low as 0.1 - 0.0db sometimes which is extremely low that's when problems occured.

"The higher the better" has never been true except on ADSL Max when on a shortish line that easily sync'ed at 8128kbps.

In the past, on BTW circuits the nearer to 6dB the better. That changed a few months ago, as on a clean line the sync-time value can be set by the DLM to 3dB. So that becomes the reference point. Similarly, on unstable lines where the sync-time margin has been set higher to help achieve stability, the nearer to the reference point the better.

On FTTC/VDSL2 the noise margin in normal setups is nothing to do with the BTW DLM. It is to do with the Openreach one. The sync-time value used by that is 6dB, (though there are I believe ISP options that allow them to request a higher value). The nearer to 6dB the better. The greater the variance from that the stronger the indication is of unwanted interference somewhere.

SNR is not determined by line length. (That being the distance from the FTTC cabinet in the case of VDSL2). It is set so as to avoid disconnections being caused by electro-magnetic noise. My Noise margin page has a more detailed explanation, using ADSLx as the basis but the methodology is the same.

Edited by RobertoS (Sun 26-Jan-14 22:38:45)

Lol

Thank you for explanation, I like your website very informative . So I guess I shouldn't wrry to much about my SNR unless it way off 6db like in the low 3's and high 2's

I have checked tonight and it is even lower. Last night was 4.5db tonight into the 3db's.
Also my attainable rate is lower that what the modem is actually synced at.

Anyway the internet is still working well so I will only worry if it gets to the 2's or 1db's.