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A new system for remotely monitoring the air or gas pressure in communications cable is described. The pressure readings are automatically recorded at a central location, thereby eliminating the need for manual measurements in the field. The system consists of remote stations, installed in the field along the cable route, which connect to the terminal station located at a central facility. A unique feature of this system is that only a single cable pair is required for monitoring 40 or more remote stations. Also described are the technical operation and features of this new system and its advantages over the alarm systems in common use today.