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Thread: Picking Up Incoming Calls Disconnect my DSL

  1. #1
    Junior Member
    Join Date
    Dec 2005

    Question Picking Up Incoming Calls Disconnect my DSL

    I recently signed up for the $15 sbc yahoo dsl plan, who gave me a Siemen router.

    Everything is superior to my old Charter Cable internet, except for this disconnection problem. When my house recieves an incoming call, and if a person or answering machine picks up the call, the dsl disconnects for the duration of the call + a few minutes.

    I am looking for additional information on this matter in an effort to fix it.

    I am pretty sure this is not a filter problem. My house has only one cordless phone and two phone jacks. I used the filters that were sent to me by sbc. They are the one that has one male and two females (one for dsl one for phone). My current configuration is the dsl line goes directly into the wall jack #1 and the cordless phone goes into the filter and into wall jack#2. I have tried all the other combinations of dsl line, wall jacks, and filters - all with the same results.

    I have also tried hooking up an extra long telephone line to a wall jack external to my house. I am assuming that this wall jack bypasses all the internal circuitry of my home. I connected a filter to this external wall jack, and connect the dsl and telephone lines into this filter. I still get disconnected when recieving an incoming call.
    --- Does this necessarily mean for sure that the problem resides in sbc's networking and not my home?

    I have asked sbc about this issue and they gave me a solution I don't think I can afford to take. They want to send a technician to my house, and when he comes, we will have to pay him $50 up front. If the problem is "our fault" than we will have to pay him more money to fix it. If the problem is "their fault," SBC will reimburse the money.

    I am reluctant to ask for this techinican unless I am sure it is SBC's fault. What are some ways I can check?

    What sites can I go to that may carry information about this topic? I don't even know what keyword to google. Has anyone ever had this problem before?

    Please help.

  2. #2
    I'm not a phone technician, but I am a technician who works with low voltage lighting control systems.

    Anyway, the answer you seek is easy to find. It's simply a process of elimination.

    First I would eliminate all inside wiring from the equation by connecting at the point of entry (as you explained you already have), when doing this though, make sure you also disconnect any wires downstream (going into the house). I would try to keep the patch cord (your temp phone cord) as short as possible and make sure you don't run the wiring along side any line-voltage (household power) wires or TV signal wires (coax).

    Actually, this is something I suspect, based on what you described, but I'll come back to it a little further down.

    This should go without saying but, don't use any of the cords that you normally use when you experience this problem. Buy a new cord if you have to, or borrow one from someone. Make sure to use your DSL line filter (and be sure you have it hooked up correctly).

    If the symptom is still there at this point, then you're almost done with your part. Now here's where the not being a phone tech part comes in. I'm not sure if Ring&Tip polarity need to be observed in this case (maybe someone who knows the answer will chime in), but you can be sure to rule that out too by simply swapping the two wires and testing again.

    Now you just need to rule out your telephone as part of the problem. Simple, borrow another phone (just a basic phone) plug that into your filtered line and see if you can recieve a call without dropping your connection. If the symptom is still there at this point then you know it's either the modem itself or the problem resides upstream of your house. Either way, you can call a technician knowing that you shouldn't be charged.

    Be careful to pay attention to the tech because sometimes the tech will twist things to make it look like it's your fault when he knows it's not the truth. If you let them, they will charge you. And DON'T LET HIM LEAVE before you test to be certain the problem is gone. If he says there's nothing he can do about it, make sure he writes exactly why in the work order.

    Now, back to the thing from above. If the problem went away when you removed the inside wiring from the equation (as described above), then you need to check a few things. First, make sure your phone wire is PHONE WIRE preferably Cat.3 or Cat.5 (twisted pair cabling), what I mean is that speaker wire, extension power cords, 12ga solid, flat phone cords (like the kind that connect your phone to the wall) are not acceptable as inner wall phone wiring. Also, (assuming you have only one phone number) make sure you have only one (1) pair of wires (either [a Blue and a White-Blue Striped] OR [a Red and a Green] depending on the type of wire) being used for your entire house.

    This is important--DO NOT CONNECT UNUSED PAIRS ATTEMPTING TO DOUBLE UP ON THE COPPER! Phones don't work the same way light bulbs do, meaning two wires is what it wants, and all it needs. Any more than two wires is going to make havoc for any type of digital signal. I'm not going to explain why cause I don't really enjoy typing, but trust me on this. Just run one pair to the first jack and then go from the first jack to the second jack with one pair. DO NOT use two pairs in the same cable jacket for two jacks sharing the same phone number. Do not use the extra wires for anything else such as doorbell, radio antenna, alarm wire, plastic explosive detonator, trip-wire to a home-made claymore, etc.

    The reason I'm stressing all of this is because this happens to be a forum for speed hungry tweekers, and so it occurred to me that you might have "improved" something you haven't mentioned. Regardless of which definition of speed you think I'm referring to nor which type of tweeker you might be...the same applies to any and all.

    The stereotype I'm referring to is the tendancy to s00p-up things with out always having the patience to learn how to do it correctly. You know, like taking the air filter out of your car to make it go faster (less air-flow restriction, right?), only not realizing that the engine management computer will see this as a failed sensor condition and put the car into limp mode (as in limp home vs. not work at all) where the air/fuel mixture isn't optimized at all, but rather rich enough that the car can be driven without being damaged...much.
    Well, using spare wires for doubling up copper fits the same profile. More copper isn't always better. C'mon, just own up to it. I bet that profile fits 9 out of 10 in here. It's okay, I've been there. Here, 10bux says that your DSL modem already has the tamper-seal broken and the tamper-proof screws already removed. LOL! Sorry, I just have a weird sense of humor. But I crack myself up!

    So back to the subject:

    It's equally important, that your phone wire isn't routed along side any sources of noise (electrical noise--not audible noise). Such sources are A/C power wires (to recepticles and light switches/fixtures etc.), transformers, A/C motors, cable/satellite TV, doorbell wires, etc. It's okay if the phone cord crosses over a piece of Romex carrying 120Volts here and there but they should not be routed side by side for longer than a foot or so. They should NEVER share the same conduit (pipe).

    Okay, thats all I can think of. I trust you will let us know the outcome?

  3. #3
    you dont like typing you could have fooled

    but very good answer..

    i could tell that the filter was in the wrong place from the first part of his notes..

    just put the filter at the main telephone line in the house all will be sorted..

    i had the same prob befoer going to cable..

  4. #4
    Junior Member
    Join Date
    Aug 2008

    YES!!! Finally Fixed

    It's was actually the ATT technician who fix the problem. Seems like he knew the problem right away. He went straight to the home phone box and removed a chip half the size of a credit card. I'm sorry I didn't ask about the chip since I was extremely happy that the problem was fix. Plus no charge. I hope this helps some of you.

  5. #5
    Junior Member
    Join Date
    May 2013

    Smile Had the same problem; it is fixed thanks to your comments

    I had the same problem with DSL dropping out whenever someone spoke to me on the phone. Tried disconnecting all phones except for the one with the DSL filter/splitter and it didn't help one bit.

    After reading the comments above, I opened up the phone company side of the Phone Interface Box (this takes a special Torx driver to open) and sure enough, there was a small black coated circuit board (probably some kind of compensation network) in series with the phone line. DSL had previously worked fine on my second phone line, and that one does not have the board. Hmmm. I didn't want to hassle calling in a technician so I went ahead and took the board out of the circuit, and now both phone and DSL work just fine!

    I think that mtruo001/grimesjr showed us a good troubleshooting technique. If you hook up a long phone extension direct to the Phone Interface Box to your DSL filter & phone so that none of your other phones are connected to the line and you still have the problem, there is probably something wrong with the phone line and you can call the technician.

    Thanks for sharing your experience, grimesjr. It was a HUGE help!

  6. #6
    Junior Member idavid4attdsl's Avatar
    Join Date
    Apr 2012
    Granite city IL
    What those units might be based on description is called "maintenance Testing units" or MTU for short. They were designed for plain voice circuits only. Typically for DSL they can interrupt the DSL signaling as the signals being sent by a modem would be in range of them. About well above 90% have been removed out of circuits within the last 20 years or so, but you might find a straggler or two left behind. The places I would find stragglers are places that had more than one phone line off the pole, or they used the 2nd pair for the dsl line to the premise and when it was defective decided to use the 1st pair but never took the device off the 1st line that they never used. They are not too difficult to remove as you can see above and all you would have to do is basically cut the wires going to it and get a couple of scotch locks and basically make the wires minus the unit whole wires again.

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