WATERPROOF PLASTIC INSULATED MULTIPAIR TELEPHONE CABLE
BELL TELEPHONE LABS INC MURRAY HILL NJ
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A waterproof plastic insulated multipair cable for long, buried, rural telephone subscriber routes is now under development. These routes employ cables having small pair counts and coarse gauge size typically 25 pairs or fewer, 19 and 22 gauge. The sheaths of these cables are susceptible to lightning and physical damage with subsequent transmission degradation high, unstable loss, noise, and possible corrosion due to the entrance of water into the cable core, which has a large percentage of air space. In the design under development this air space is filled with a dielectric compound, consisting of polyethylene and petroleum jelly, which prevents liquid water ingress and thus stabilizes the transmission parameters. Capacitance stability on the order of 1 or less has been achieved on experimental samples immersed in water for many weeks.
- Electrical and Electronic Equipment
- Non-Radio Communications