DEPARTMENT OF THE ARMY - Distributing Frames All-Relay 200-Point Dial Central Office Department of the Army Technical Manual

Washington, D. C.: U. S. Government Printing Office, 1950. 1st Printing. Hardcover. This is an oversized paperback book with cardstock covers and a stapled spine. The book covers have some bumping and wear to the spine ends and corners. There are a couple of spots of rubbing and ground-in dirt to the covers as well. The text pages are clean and bright, though noticeably with generalized toning. "In telecommunications, a distribution frame is a passive device which terminates cables, allowing arbitrary interconnections to be made. For example, the Main Distribution Frame (MDF) located at a telephone central office terminates the cables leading to subscribers on the one hand, and cables leading to active equipment (such as DSLAMs and telephone switches) on the other. Service is provided to a subscriber by manually wiring a twisted pair (called a jumper wire) between the telephone line and the relevant DSL or POTS line circuit. In broadcast engineering, a distribution frame is a location within an apparatus room through which all signals (audio, video, or data) pass, with the ability to arbitrarily route and connect sources and destinations between studios and other internal and external points." (from Wikipedia). Very Good .

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