yes highest I ever seen I think was in the 76 range.

In reply to a post by Chrysalis:

engineer I guess normally would have just left, as he been telling me 80mbit sync not possible on FTTC at all (justify current situation), but he got a call whilst here from high level of BT telling him to persist, so he is off to cabinet now and ringing me back in a bit.

He doesnt seem keen to do a pair swap.

So, how did you get on Chrysalis?

BTW, did you see any changes in your Hlog graph (especially a 'V' shape) when your sync speeds dropped right down, or were you using the ECI modem at the time?

hlog and attenuation didnt change, there is no active faults found on the line (during the test).

Case is currently not closed, they said will book a 2nd engineer next week but they didnt book it yet so I am not convinced. The first engineer was supposed to report back to them but he didnt, I couldnt get him to do a pair swap,

It does seem currently that its probably very bad crosstalk. on the sync speed but I have also outages.

The engineer wasnt particurly great either badly trained or deliberatly trying to mislead me, claiming the 80mbit sync I had originally was not possible as requires FTTP.

Edited by Chrysalis (Sat 06-Apr-13 01:42:44)

Considering we know EXACTLY what the Huawei line cards are capable of (in controlled conditions) its pretty worrying that the engineers are so uninformed.

For the record, I also have mostly LED lighting in the house but am getting a 99Mbit sync on my Digital Region line. Although they are the ones that screw straight in with their own PSUs in each one, rather than having a single bigger PSU running a bunch of them.

Edited by alexatkin (Sun 07-Apr-13 23:19:26)

The engineers doing the domestic installations and maintenance don't have anything to do with the FTTC cabinets or what's inside them.

All they have to do is jumper the lines from the exchange and the premises for the specific customer to the patch panel installed in the PCP, to make a loop to the FTTC cab and back.

Most of our LEDs are GU10 5w spots which have inbuilt drivers. 23 of them. Three 8w E27s in one fitting and an 8w B22 the same. Something else with a similar legacy fittting in a table lamp - I forget what. Plus a 1w bedside lamp (a waste of ~£5 from Sainsbury's).

The bathroom has two banks of 3 assemblies each on a common dimmable driver, (no dimmer switch installed), each assemby having 3 x 3w in a recessed tilt housing. So 54w there.

As I said, no FTTC problems being caused so far as know.

claiming the 80mbit sync I had originally was not possible as requires FTTP

perhaps he meant you can only have an 80M IP Profile on FTTP.

maybe but I did say clearly connection speed and that throughput was around 76mbit.

Then there is the bit where he asked me what my estimated was and his JDSU was 11mbit below the estimate which he didnt bat an eyelid at.

In reply to a post by yarwell:

claiming the 80mbit sync I had originally was not possible as requires FTTP

perhaps he meant you can only have an 80M IP Profile on FTTP.

Which you can't either.

In reply to a post by RobertoS:

The engineers doing the domestic installations and maintenance don't have anything to do with the FTTC cabinets or what's inside them.

All they have to do is jumper the lines from the exchange and the premises for the specific customer to the patch panel installed in the PCP, to make a loop to the FTTC cab and back.

Most of our LEDs are GU10 5w spots which have inbuilt drivers. 23 of them. Three 8w E27s in one fitting and an 8w B22 the same. Something else with a similar legacy fittting in a table lamp - I forget what. Plus a 1w bedside lamp (a waste of ~£5 from Sainsbury's).

The bathroom has two banks of 3 assemblies each on a common dimmable driver, (no dimmer switch installed), each assemby having 3 x 3w in a recessed tilt housing. So 54w there.

As I said, no FTTC problems being caused so far as know.

In line with your comments.

All my incoming circuits end up in a small purpose built loft above an upstairs hallway. In there are the various LTUs for analoig and anlaog + VDSL; the modem; router; additional WAP; burglar alarm control; and a few other bits.

The lines come through the adjoining attic and into the floor space of the loft, That floor space has a few power cables - all low power usage running through along with several high quality GU10 downlighters which use LED lamps with inbuillt converters. My VDSL line passes within maybe 400-500mm of a couple of the lamps and I see no interference from them.

Previously when I had ADSL I did put the incoming line close and noticed a drop in speeds.

But I have seen cases where there have been some problems caused by LED converters - often the type which are remote from the LEDs.

In reply to a post by yarwell:

how much interference does a simple bridge rectifier produce ? Is switching the right choice of technology for a simple power supply if the result is excessive RFI ?

Down to good design and price.

I will build you a 240AC to 5V DC switching converter that will obliterate everything! And cost £2 to produce

Give me four times as long and I will design ones which will be almost "silent". And cost £3 to produce.

Unfortunately everyone want everything cheap - they decide on price and NOT performance in too many cases.