Voice, data or both over one telephone line in a T-1 carrier system
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United States of America Patent
Stats
-
Mar 8, 1988
Grant Date -
N/A
app pub date -
Feb 21, 1986
filing date -
Feb 21, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A standard T-1 span is connected to a digital central office or remote terminal. Telephone equipment for such a T-1 span defines a superframe format with each frame of the twelve frames of a superframe having twenty-four eight-bit position time slots. Telephone system signalling requires T-1 signalling bits be located in the least significant bit position of each time slot in every sixth frame. In the disclosed system, simultaneous digitized voice and data share a single time slot for transmission along with the T-1 signalling bits in that time slot. In order to achieve the additional capability, the disclosed system employs least and next-to-least digitized voice bit swapping and a data bit occupying the space of the swapped least significant digitized voice bit, which bit is deleted.
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