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A 4-Wire Solid-State Switching System: Numbering Plan and Signaling System

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2 Author(s)
A. Bergmann ; Impulsor Mexicana, Mexico City, Mexico ; F. Haferd

Signaling is simplified by the adoption of a universal numbering plan. Addressing between centers and from subscriber keysets uses the same inband v-f combinations. Supervision on trunks is accomplished with single frequency tones. For subscribers on local metallic lines advantage is taken of the 4-wire phantom for dc loop supervision and battery feed to normal subscriber instruments. Protection against fading or interruption of the trunk transmission path is achieved by a unique interlocking of all addressing and supervisory signals. Simulation is minimized by using a special grouping of v-f combinations and timed single frequencies.

Published in:

IEEE Transactions on Communication Technology  (Volume:12 ,  Issue: 4 )