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Author Topic: Ferrites  (Read 773 times)

Weaver

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Ferrites
« on: June 15, 2018, 06:47:09 AM »

Could someone recommend some ferrites for me? To fit on modems’ dc cables. Could you point me to a supplier?

I recall that I have been warned about this voodoo before.  ;D

--
One other thing:
Did someone recently mention putting them around DSL cables? Did I really read that right? Would that not be the last thing you would want, to block high frequency ‘noise’ ie - signal? ?Or have ?I misunderstood?
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michty_me

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Re: Ferrites
« Reply #1 on: June 15, 2018, 08:13:40 AM »

I got a few packs from Maplin many moons ago, I suspect an internet bidding website would be your best bet.
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Weaver

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Re: Ferrites
« Reply #2 on: June 15, 2018, 08:14:39 AM »

Yes, I got mine from Maplin I think last time. But have they not had it now?
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michty_me

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Re: Ferrites
« Reply #3 on: June 15, 2018, 09:09:25 AM »

Unfortunately yes, They went into administration and had a big sell off of their old stock. You could try RS or Farnell but I suspect they will be more expensive than other places.
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Ixel

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Re: Ferrites
« Reply #4 on: June 15, 2018, 01:47:30 PM »

https://www.ebay.co.uk/itm/Slow-Broadband-Problems-3M-White-Highest-Quality-Modem-Router-Lead-DSL-Cable/112852611116

There's these cables on eBay which claim to be a choked screened stranded Cat6 twisted copper pair cable. I use them on both of my connections. Don't know if there's a massive difference to be honest but figured it must be better than the cheap flat cable that's normally supplied with modems.
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michty_me

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Re: Ferrites
« Reply #5 on: June 15, 2018, 01:54:25 PM »

Interesting. I've always just used the chunky adslnation/Lindy (think that's where I got them??) Cable. Can't see them on their website anymore though.
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spring

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Re: Ferrites
« Reply #6 on: June 15, 2018, 02:27:31 PM »

I'm looking for microfilters for VDSL2, any direction?
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burakkucat

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Re: Ferrites
« Reply #7 on: June 15, 2018, 04:16:21 PM »

Not rhetorical questions . . .

Those who use a screened (or shielded) xDSL cable, to what is the screening (or shielding) connected? And how is is connected?  :-\
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Ixel

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Re: Ferrites
« Reply #8 on: June 15, 2018, 04:21:59 PM »

Not rhetorical questions . . .

Those who use a screened (or shielded) xDSL cable, to what is the screening (or shielding) connected? And how is is connected?  :-\

Without cutting open the cable I don't imagine I could answer that, and I don't want to do that as it would probably damage the cable :P.
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burakkucat

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Re: Ferrites
« Reply #9 on: June 15, 2018, 04:29:40 PM »

Without cutting open the cable I don't imagine I could answer that, and I don't want to do that as it would probably damage the cable :P.

I can save you the trouble. The screening (or shielding) is not connected to anything. Consider the modular plugs at either end. There is no dedicated pin for such a connection.  :)
« Last Edit: June 15, 2018, 04:31:57 PM by burakkucat »
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j0hn

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Re: Ferrites
« Reply #10 on: June 15, 2018, 04:33:39 PM »

Without cutting open the cable I don't imagine I could answer that, and I don't want to do that as it would probably damage the cable :P.
I suspect the answer is that it isn't grounded at all.

To my mind there is no such thing as a properly shielded (and grounded at both ends) dsl cable.
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Ixel

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Re: Ferrites
« Reply #11 on: June 15, 2018, 04:55:58 PM »

Very true, but I guess the cable doesn't claim that it's grounded either :).
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4candles

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Re: Ferrites
« Reply #12 on: June 15, 2018, 04:59:48 PM »

I'm looking for microfilters for VDSL2, any direction?
VDSL2 should be connected via a filtered faceplate at the master socket if at all possible.
If microfilters must be used, so-called VDSL2 types are the same as any microfilter - essentially a low pass filter to pass voice and block broadband.
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spring

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Re: Ferrites
« Reply #13 on: June 15, 2018, 09:31:26 PM »

VDSL2 should be connected via a filtered faceplate at the master socket if at all possible.
If microfilters must be used, so-called VDSL2 types are the same as any microfilter - essentially a low pass filter to pass voice and block broadband.
Thanks for confirming what I've heard, although when I said VDSL2 I meant qualified/high-spec.
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Weaver

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Re: Ferrites
« Reply #14 on: June 16, 2018, 12:00:26 AM »

This thread seems to have got off topic. I myself am the worst of offenders.  ;D  could maybe split the last n posts and discuss cables elsewhere.

I asked about spec of ferrites and suppliers, in relation to dc cables. I will try eBay.
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