About DSL
Posted: Mon May 01, 2017 5:47 pm
First, I think am currently in full command of my faculties. I don't drink (to excess) nor or do I use drugs.... but probably should start!
My daughter called today about a phone problem they are experiencing that just started today.
This a simple system, 3 or 4 jacks and a alarm dialer connected through an RJ31X, and it has all worked for 15 years.
They have DSL through Verizon, and the telephones all have DSL filters and the modem is plugged into a normal jack
In a nut shell, They have internet connectivity at the inside jack, but no phone service at any inside jacks, including the one the modem is connected to!
She says it is dead, and cannot hear a dial tone, no side tone and none of the buttons will dial, so it seems there is no battery on the line.
They unplugged the DSL filters, unplugged all telephone sets and went room to room with a test telephone, and still no connection was evident.
The wireless phone has an IN USE message since it cannot detect the on hook battery voltage.
But wait, here's the hooker! There is dial tone at the interface, and they can call out with the test phone from there and all is well.
Now, this not my first pole climb and I know this just makes no sense. The internet signal and phone signals are all on the same pair coming through he house with
no separation of the services. That is why the DSL filters are used, to keep the computer traffic off of the phones. I have seen where a separate line is run ahead of a DSL filter for the computer and all the phones are behind the DSL filter. Yes, if the filter were to open, no dial tone, but that doesn't explain the lack of dial tone at the computer connection!
No, I have not been there to look it over, but probably will need stick my nose in, but my daughter is pretty savvy, follows directions and has the right answers,except that now they don't add up.
A Google search shows this problem as a common one for DSL, except, and here's the big exception, nobody has claimed to have this problem and still have telco service at the interface?
So since a DSL modem sits across the T/R all the time it must be a high impedance device. Maybe there is a crappy connection between the interface and the rest of the inside wiring,
that allows the DSL signal through but cannot provide the current for the phone. Even at that, I would expect that there would at least be some hum or noise on the phones inside. If the phones are not vintage telephones, but have electronic circuits, probably they are stone dead since there is not enough voltage to make them smart. I'll post back after the autopsy. I will not give up my orange test set!
Opinions, comments whatever, throw it out
My daughter called today about a phone problem they are experiencing that just started today.
This a simple system, 3 or 4 jacks and a alarm dialer connected through an RJ31X, and it has all worked for 15 years.
They have DSL through Verizon, and the telephones all have DSL filters and the modem is plugged into a normal jack
In a nut shell, They have internet connectivity at the inside jack, but no phone service at any inside jacks, including the one the modem is connected to!
She says it is dead, and cannot hear a dial tone, no side tone and none of the buttons will dial, so it seems there is no battery on the line.
They unplugged the DSL filters, unplugged all telephone sets and went room to room with a test telephone, and still no connection was evident.
The wireless phone has an IN USE message since it cannot detect the on hook battery voltage.
But wait, here's the hooker! There is dial tone at the interface, and they can call out with the test phone from there and all is well.
Now, this not my first pole climb and I know this just makes no sense. The internet signal and phone signals are all on the same pair coming through he house with
no separation of the services. That is why the DSL filters are used, to keep the computer traffic off of the phones. I have seen where a separate line is run ahead of a DSL filter for the computer and all the phones are behind the DSL filter. Yes, if the filter were to open, no dial tone, but that doesn't explain the lack of dial tone at the computer connection!
No, I have not been there to look it over, but probably will need stick my nose in, but my daughter is pretty savvy, follows directions and has the right answers,except that now they don't add up.
A Google search shows this problem as a common one for DSL, except, and here's the big exception, nobody has claimed to have this problem and still have telco service at the interface?
So since a DSL modem sits across the T/R all the time it must be a high impedance device. Maybe there is a crappy connection between the interface and the rest of the inside wiring,
that allows the DSL signal through but cannot provide the current for the phone. Even at that, I would expect that there would at least be some hum or noise on the phones inside. If the phones are not vintage telephones, but have electronic circuits, probably they are stone dead since there is not enough voltage to make them smart. I'll post back after the autopsy. I will not give up my orange test set!
Opinions, comments whatever, throw it out