J-2Y(st)YRY, JE-2Y(st)YRY, J-Y(st)YRY, JE-Y(st)YRY
Telecommunication cables are used to transmit electromagnetic waves, they are called electromagnetic wave guides.Those cables are installed in open air, underground, indoor or outdoor.
The overall screening of the pairs protect it against outer electrostatic interference fields.
Armoured types would be able to bear external mechanical forces.