[geeks] Roll your own DSL

[James Sharp]

> speaking of such things, back to using dsl on an alarm loop:
>
> if dsl doesn't interfere with voice on normal lines, how does it on an alarm circuit?
>

When the telco provisions a line for ADSL, SDSL, or HDSL (T1 over copper),
they try to pick cables in the bundle away from other services to help
limit cross talk and interference.

They don't take such precautions when provisioning an alarm
circuit...since they're just supposed to carry DC and/or low frequency
stuff that won't crosstalk or interfere with other cables in the bundle.