Thread: Broadband

I can't comment directly on your set up, but as I understand things if you have broadband either ADSL or Cable it should not be afected by incoming or outgoing phone calls in any way

I got a second filter here somewhere. Only have one phone in the house and it has the filter on it.

The phone line is split so that there is two connections in the house, but the cable just plugs straight into the socket and no filter is needed because there is no phone connected there.

Anyway the ISP said it was fine to work like that and I have not had any dropout when the phone rings

Richard, I would suggest that she checks with her ISP. I hope that she has one with good rep for service and support.
I agree China, the broadband should not be affected by the phones. The filters prevent the broadband signal interfering with the phones.
Hope you get it solved soon!

Bugga. She had a second extension put in to handle the internet and I don't know how that was wired.

The lad's running a Hewlett Prattard (deliberate spelling) so there might be something odd in there I suppose.

I asked about things like call waiting and other Telstra options but she has none of them. Her telephone does have an answering machine and is a cordless system, but I can't imagine that causing the problem.

The ISP is Bigpond so there shouldn't be anyproblems getting answers out of them.

Richard

Yes you do need a filter on each outlet thats in use, well at least thats what the book says.
I had a faulty filter here and thats the symptom I got, ADSL would drop out for a minute when the phone rang. Put a new filter in and it's fine now.

Cheers

Ian

Sludgepond, have had issues with filters recently (A number of guys here have had the same prob). Give them a call, or go back to the shop you got it from , they should replace it for you

Originally Posted by Daddles

My gf has just got broadband for her kid.

Sounds like a fair swap.

Al

Richard, as GRA said, there have been filter problems. At our place we have somewhere around 6 phone points and all have filters, including the fax. Suggest you remove the second line temporarily and dial in. If the ADSL goes TU then the filter is faulty, if not then you know it was the second phone.

It is my understanding that the filter is to stop the computer interfering with the phone system rather than the other way around. Therefore, so long as the filter is between the ADSL modem and the phone line and is plugged into the socket marked "ADSL Modem", then you only need one filter.

You need two filters if you are connecting two computers with separate ADSL modems or you need to move the computer from one phone outlet to another without moving the filter too (such as when moving from room to room).

That's the way mine is (it is also Bigpond) and there are no problems. See attachment.

regards
Coldamus

In the diagram, I don't think that there should be "Other Phones" ahead of the filter.

The way that DSL or ADSL works is the braodband uses a frequency range significantly higher than the PSTN uses for normal voice traffic. The filter does two things.

First, the filter removes the higher frequencies from the voice side. The phone typically uses frequencies from about 200Hz to 2200Hz.

Second,the filter sends the higher frequencies to the ADSL modem. The broadband ADSL uses frequencies up to 5,000,000Hz. If these higher frequencies hit an ordinary phone, a low volume hiss is heard, hense the need for the filter.

The ringing voltage is usually 50 volts AC. (I don't remember the frequencies used in Australia for ring in your PSTN.) The ADSL modem needs to be protected from this voltage as the ringing could overwhelm the data signal detection circuits in the modem. If a circuit is looking for a quarter to half volt, a 50 volt ring tone would drive the circuit into satuaration. This would make the data signal circuit deaf for a short period of time. Usually the way that data circuits work is that if the receiver (the modem and computer) don't "hear" the remote end for a second or two, a malfunctioning circuit is assumed and the data service is disconnected.

Edit in
Excuse the jargon. PSTN is Public Switched Telephone Network

Originally Posted by Daddles

Yes, I know she's one filter short,

OOOOOHHHHH Daddles... Dont let her hear you say that!

Originally Posted by rrich

In the diagram, I don't think that there should be "Other Phones" ahead of the filter.

In effect, all of the phones are ahead of the filter, just as they would be if no ADSL modem and computer were present. The second outlet on the filter body that the phone is plugged into is unfiltered. It is only provided to make up for the loss of the wall outlet that is taken up by plugging the filter into the wall socket.

What matters is that the filter is between the modem and the phone system to prevent the harmful frequencies arising from the modem from interfering with the user's own phones and those of the neighborhood. This is basically as you described except that I think you may be looking the wrong way round.

regards
Coldamus

Maybe I didn't say it correctly.

The drop from the PSTN goes to a filter.
The filter feeds all the phones in the house.
The filter feeds the ADSL modem.

The phones never hear the broadband stuff and the ADSL modem never hears the phone stuff. The PSTN hears everything and processes everything. The purpose of the filter is to separate the two signal types inside the home.

Maybe your PSTN does it different than ours?????

Nope, rrich, you have it right.

You need a splitter for the point that the ADSL Modem is on & a filter for every other point on that number that has a regular telepone device on it.

We had an instance last year where a shop full of travel agents had been loosing connection to the outside world several times a day after ADSL had been installed.

Long story short, after we had changed EVERYTHING twice, one of the blonds happened to say out loud while I was there "Hang on girls, I'm about to do a credit card sale so save what you are doing" :confused:
I said "WHAT?".....:eek:

Yeap, you guessed it, they had worked out that the computers 'always' went down when they did a credit card sale & they didn't think to mention that to the IT people 'cos they 'thought we already knew that'

The EFTPOS terminal on the front counter was on the same line as the Fax & the ADSL modem. The Fax & ADSL shared a splitter in the back room & nobody knew that the EFTPOS terminal was on the same line & it didn't have a filter.