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maritime DC & PPE Information Center

Ship’s Service Telephone

The Ship’s Service Telephone Circuit (J-Dial) requires an external electrical power source and has a keypad just like a home phone. When installed, it may be used as an alternate means of communication. The J-Dial system shouldn’t be relied upon because it is not as rugged as the sound-powered phone system and may go out of commission early in action. Some of the newer systems have a limited battery backup in the event of a loss of electrical power. On some ships, the J-Dial phones are available for damage control communications when located near or at repair stations and may be used when other damage control communication systems are inoperative.

Image of Ship's Service Telephone Image of Ship's Service Telephone
Images of Ship's Service Telephone


For more information, see the Index.