Voice, data or both over one telephone line in a T-1 carrier sys

Details Voice, data or both over one telephone line in a T-1 carrier sys Voice, data or both over one telephone line in a T-1 carrier sys

1986-02-21

1988-03-08

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

H04J 312

Patent

active

047303123

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.

REFERENCES:
patent: 3030448 (1962-04-01), Leonard et al.
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patent: 3821478 (1974-06-01), Hillman, Jr. et al.
patent: 4467469 (1984-09-01), Krikor
patent: 4476559 (1984-10-01), Brolin et al.
Motorola Inc. Telecommunications Device Data, 1984, pp. 2-279-2-332, pp. 2-279-2-332, and 3-23-3-36.
T. A. Abele and A. J. Schepris, "Overview", AT&T Bell Laboratories Technical Journal, vol. 63, No. 10, Dec. 1984, pp. 2273-2281.
M. M. Luniewicz, J. W. Olson, and K. E. Stiefel, "Channel Bank", AT&T Bell Laboratories Technical Journal, vol. 63, No. 10, Dec. 1984, pp. 2283-2331.

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