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Standard User Woolwich
(member) Tue 28-Nov-17 10:36:59
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Do I need a filter for FTTC?


[link to this post]
 
I had FTTC at another location which was installed by BT/OR. The 'master' socket had landline and broadband ports and I didn't use a filter.

I'm getting a connection at a new location where I'm plugging in myself. The 'master' socket here is a type "5C" which has only one phone port.

Where do I plug my modem/router in?! Do I need a filter? Like the ones I used to use back in the ADSL days? Like one of the half dozen I threw away?
Administrator MrSaffron
(staff) Tue 28-Nov-17 10:38:32
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Re: Do I need a filter for FTTC?


[re: Woolwich] [link to this post]
 
Yes you would need a microfilter

If the ones you threw away where years old possibly a good thing, as over a long time some filters do start to perform less well

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User BatBoy
(sensei) Tue 28-Nov-17 10:49:58
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Re: Do I need a filter for FTTC?


[re: MrSaffron] [link to this post]
 
There must be a way to upgrade the master socket. Is it just a new faceplate with two outputs?


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Standard User Woolwich
(member) Tue 28-Nov-17 10:53:41
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Re: Do I need a filter for FTTC?


[re: MrSaffron] [link to this post]
 
You know, I think some were 'brand new', just never used...

Is a filter, a filter , a filter? Or should I look further than the cheapest from PC Wurld?
Standard User Woolwich
(member) Tue 28-Nov-17 10:56:27
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Re: Do I need a filter for FTTC?


[re: Woolwich] [link to this post]
 
TBH, I'm not going to be here long enough to worry about it. Not my flat so best not fiddle too much. A filter will suffice. OTOH, I'd be interested to hear if you can buy a new faceplate with a filter built in - just for future reference. That was pretty much what I used to have.
Standard User MHC
(sensei) Tue 28-Nov-17 11:03:10
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Re: Do I need a filter for FTTC?


[re: Woolwich] [link to this post]
 
Ignoring the ageing effects on some filters.

Older filters were good for ADSL but their high frequency characteristics were not optimised for VDSL although they would still work. Users may often see lower than expected results.

There are a variety of filters out there - some cheap and some expensive and some a real rip off! If you are not too worried about getting the best possible speeds than a cheap filter off ebay will suffice, however if you want the best possible performance, hopefully another member here will be able to suggest the best options.


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M H C


taurus excreta cerebrum vincit
Administrator MrSaffron
(staff) Tue 28-Nov-17 11:11:40
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Re: Do I need a filter for FTTC?


[re: Woolwich] [link to this post]
 
Filtered versions of the 5C faceplate are available, though not on Amazon as older ones used to be, but maybe ebay.

Suspect that not all sources were genuine and some may have been stock going missing from Openreach stores

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User BatBoy
(sensei) Tue 28-Nov-17 11:16:02
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Re: Do I need a filter for FTTC?


[re: MrSaffron] [link to this post]
 
I see mymatevince.com has closed his mrtelephone shop on ebay until January 2018
Standard User Michael_Chare
(fountain of knowledge) Tue 28-Nov-17 11:33:09
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Re: Do I need a filter for FTTC?


[re: Woolwich] [link to this post]
 
It is phones rather than broadband modems (router modems) that need filtering.

Ideally there should be a filtered faceplate and any phones connected via the filter that this contains.

If there are no phone extensions then using a filter at the master socket is mostly a convenient way of connecting the RJ11 cable that comes from the modem.

The property may be star wired, i.e. there may be an extension that is not connected via the master socket but to an earlier star point. If that is the case the extension wiring may cause problems even if nothing is attached to the end and just puting a filter at the end will.not eliminate the problem.

Michael Chare
Standard User Woolwich
(member) Tue 28-Nov-17 11:48:16
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Re: Do I need a filter for FTTC?


[re: Michael_Chare] [link to this post]
 
Actually, I don't plan on using the landline at all, not even connecting a handset. So I don't really need a filter.

But now I need an RJ11 to phone socket connector. Like one of the dozens I threw out from the days of dial-up modems...
Standard User Michael_Chare
(fountain of knowledge) Tue 28-Nov-17 12:28:03
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Re: Do I need a filter for FTTC?


[re: Woolwich] [link to this post]
 
Maybe you know someone who has a collection of unused filters.smile

Michael Chare
Standard User jabuzzard
(regular) Tue 28-Nov-17 16:45:15
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Re: Do I need a filter for FTTC?


[re: MHC] [link to this post]
 
In reply to a post by MHC:
Older filters were good for ADSL but their high frequency characteristics were not optimised for VDSL although they would still work. Users may often see lower than expected results.


Hum, do you wish to explain how a low pass filter that works for ADSL is not optimized for VDSL given that VDSL operates at a higher frequency than ADSL? There must be some new laws of physics that I am not aware of.
Standard User MHC
(sensei) Tue 28-Nov-17 16:54:11
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Re: Do I need a filter for FTTC?


[re: jabuzzard] [link to this post]
 
I think that you need to check up on filter design.

It may be low pass but that does not mean it is perfect at all frequencies above that especially when they are cheap single stage. They can have effects on signal level and phase.

Having looked at some many years ago, we actually saw that one or two versions which actually had high frequency pass bands somewhere around 10MHz.


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M H C


taurus excreta cerebrum vincit
Standard User ukhardy07
(knowledge is power) Tue 28-Nov-17 19:54:49
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Re: Do I need a filter for FTTC?


[re: Woolwich] [link to this post]
 
Just ring your ISP, when I moved I had done the same thing and I called BT, a day later I had 6 sent to me (bit of an overkill but thanks BT).
Standard User MatHal
(newbie) Tue 28-Nov-17 21:23:40
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Re: Do I need a filter for FTTC?


[re: Woolwich] [link to this post]
 
The micro-filter is there purely to prevent the DSL signal getting into the telephone where it may cause trouble. There is no need to filter out the low (audio) frequency phone signal from the DSL signal to the modem as the modem will do that very effectively.
None of the filters I have seen applies any filtering whatsoever to the DSL signal. That said, if the low-pass phone filter is not working properly then some of the DSL signal could be getting into the phone and being lost, which MAY make a slight difference to your internet sync speed. It would depend on the phone and the filter.
FTTC is no different to ADSL in this respect, both use the phone line for internet data, though FTTC uses more channels, at higher frequencies, to get the increased bandwidth.
If you do not intend to attach a phone then you do not need a filter at all and it would be better not to have one.
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