The electric company/phone company. If you have a concern with the trees/shrubs growing into the wires comtact them and let them know they'll send someone out to look at it
11/16/11: This is not accurate - The electric company trims trees from their "PRIMARY" overhead lines (those usually highest up on the poles). However, at least in Pennsylvania, they do NOT trim trees from "secondary" lines or the lines going from the pole to your house. Furthermore, the phone company does no tree or shrub trimming whatsoever. I know, as I just reported tree limbs on a Verizon phone line and was told it's my problem. They'll fix the line after the tree limb brings it down, but evidently are not interested in preventing a problem.
The authority concerned and the owner of the tree.
Thomas MErrill and Lawrence G. Roberts
boring
no not at all
Communication channels.
Long distance telephone lines.
Telephone lines are made of iron or steel. Between the iron or steel core and the pipe is an insulating material. All Telephone lines are made and work this way.
Atoms in the atmosphere of the star is responsible for the dark lines in its spectrum.
VoIP replace your telephone networks but your existing telephone numbers can be use again to maintain your contacts.
A modem. However, there is a card that can connect computers trough telephone or cable television lines, too.
There were basic telephone lines in the commanding tents and runners who delivered messages if the telephone and telegraph lines failed.
Telephone mainlines are telephone lines connecting a customer's equipment to the public switched telephone network.