Telephonic communications – Centralized switching system – Structure of equipment
Patent
1987-06-18
1989-05-09
Brown, Thomas W.
Telephonic communications
Centralized switching system
Structure of equipment
379332, 439296, 439540, 439701, H01R 2302, H01R 3100, H04Q 114, H04Q 118
Patent
active
048295647
ABSTRACT:
A main distribution frame (MDF) board for connecting a plurality of stations to a system or switch, or an intermediate distribution frame (IDF) board for connecting an input cable to an output cable, comprises: sets of barrel connectors to which the stations are wired (in the MDF embodiment) or an input connector for connecting the input cable to the board (in the case of the IDF embodiment); an output connector for connecting the output cable to the board; and a plurality of jacks for interconnecting the barrel connectors or input connector to the output connector. The jacks utilized in this arrangement, and their corresponding plugs, are designed such that, when a plug is not inserted into a jack, odd numbered pins are connected to even numbered pins within the jack. Conversely, when the plug is inserted into the jack, the aforementioned connection is broken. Accordingly, problems occurring in the board wiring between the even numbered pins of a jack and the output connector can be easily bypassed by an unskilled person by inserting one end of a jumper cable into the jack, identifying a further unused jack, and inserting a plug at the other end of the jumper cable into the unused jack.
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Brown Thomas W.
Seeber Joseph G.
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