Descr Phys Line Probs

If a line receives phone service ok but refuses to work with DSL,\\what could be the problem? Is it possible old twisted junctions are too noisy? Is it possible that old 1960s cable is too frazzled? Assuming you had some kind of meter to test along the line, what would you be physically looking for once you found out the problem was in a certain region?

- = - Vasos-Peter John Panagiotopoulos II, Reagan Mozart Pindus BioStrategist

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For DSL to operate properly there are certain physical line characteristics that must be met. Typical conditions are:

Loop length under 18,000 ft No loading coils Bridgetaps not exceeding "x" number of feet No grounds, shorts or crosses to battery.

Assuming that all of the above are met, a loop should be able to carry a DSL signal.

There are impairments that can be "silent" to voice traffic but will kill a DSL signal. Light shorts (we call them shunts) may not affect the voice portion but would kill the DSL signal, especially at longer distances.

You mention 1960'd wiring. Is that in your house? That could be a possible source of the problem. Do you have an alarm system? Did the previous owner? Even if you aren't actively using the alarm system, if it's still connected to the phone line it can cause problems.

Do any of your utility companies remotely read the meter over the phone line? Those devices can also cause problems.

Try connecting your DSL modem at the Network Interface, with all the inside wiring disconnected. Does it work OK there? If yes, then you have an inside wiring issue. If it doesn't work at the NID then there is absolutely a line issue that needs to be resolved.

Hope this helps!

John