Superhub : Buzzing from SuperHub while on power?

[Milambar]

Out of pure curiosity, since as far as I know theres no moving parts in them, why do they make a noise?

[colmm]

Its a 'squelling' sound, can hear it over TV at low at night time.

Will call support team and let you all know what happens..
Thanks again for everyones input...!
C

[heero_yuy]

Originally Posted by Milambar

Out of pure curiosity, since as far as I know theres no moving parts in them, why do they make a noise?

It's a phenomina called Magnetostriction whereby when a material is magnetised its dimensions change slightly. The noise comes from the ferrite core in the transformer. Normally when we design these things we make them run ultrasonically so you can't hear the noise.

It's the same effect that makes the transformers in substations hum or even your microwave.

On a light load sometimes the power supply goes into a "bang-bang" mode (nothing to do with explosions!) where it runs in small bursts and that's the buzzing or frying noise or the frequency falls so much that you hear it singing.

[Milambar]

Thank you for that explanation

[carbon60]

When my modem was changed for a Superhub last week the technician simply used the existing power supply. I'm not 100% convinced that was the correct thing to do. On one hand there's no chance of it buzzing, on the other hand it might not be fit to do the job long term.

[heero_yuy]

Originally Posted by carbon60

When my modem was changed for a Superhub last week the technician simply used the existing power supply. I'm not 100% convinced that was the correct thing to do. On one hand there's no chance of it buzzing, on the other hand it might not be fit to do the job long term.

If it's the right rating then there shouldn't be an issue. Far too many PSU's end up in landfill for no other reason than the wrong interpretation of the ratings.

[carbon60]

Originally Posted by heero_yuy

If it's the right rating then there shouldn't be an issue. Far too many PSU's end up in landfill for no other reason than the wrong interpretation of the ratings.

Agreed, however I have no idea what the spec should be.

[kwikbreaks]

The Superhub PSU is 12v 1.5A. Most likely your modem PSU was 10v 1.0A and isn't up to the job. You need to call it in. They'll alnmost certainly send you a complete new Superhub pack as their system isn't up to fixing what must be the most common installation error there is.

[Peter_]

Originally Posted by kwikbreaks

The Superhub PSU is 12v 1.5A. Most likely your modem PSU was 10v 1.0A and isn't up to the job. You need to call it in. They'll alnmost certainly send you a complete new Superhub pack as their system isn't up to fixing what must be the most common installation error there is.

Nothing to do with the system simply because the Superhub and powerpack are not supplied separately, but you already know that but it is worth another moan as it fits in with your known agenda.

Every single modem be it from Virgin Media, SKY or BT come as as single pack but again you already know this as does everyone else, no company is going to have a supply of powerpacks sitting on a shelf because it is a waste of money and takes up valuable storage space which also has to be paid for by the customer.

[craigj2k12]

the ceo office had separate power packs when they sent out VMNG's due to the superhubs failure, everyone who got one was sent a refurbed VMNG with a superhub PSU

[kwikbreaks]

CEO office isn't really part of the main system though - you'd have thought that it would make financial sense to keep an inventory of replacement PSUs which could be issued to replace the noisy ones and those where the engineer has goofed. Both problems get mentioned a lot and every time it's another hub heading for landfill as they never seem to ask for them back - I've got one dismantled and a whole one in the loft in case they ever do ask.

[jb66]

I order my psus separate so it is possible especially with half the psus are very noisy and the other are slinky noisy

[kwikbreaks]

I guess that's for replacements by you while you're on site though - I'm pretty much certain that normal TS can only send out a complete package to replace the lot for wrong and noisy PSU issues which seems a bit daft. I suppose it's possible that the poster I don't read said I'm wrong and they can a couple of posts above (I see the fact a post was made but not the content) in which case sorry as I'm only reporting what I've read elsewhere in the past.

[Peter_]

The is always one person who does not read certain posts as it does not fit in with their agenda and because of that they are a rather sad loser.

The has never been an option to send a powerpack for any modem right back to the old Terayon modems because the warehouse would be full of old unwanted powerpacks and oddly they cannot get their head around that simple fact, imagine the loss incurred stocking powerpacks that are never used.

[craigj2k12]

Originally Posted by jb66

I order my psus separate so it is possible especially with half the psus are very noisy and the other are slinky noisy