Method of multiplexing digital signals and apparatus therefor

Details Method of multiplexing digital signals and apparatus therefor Method of multiplexing digital signals and apparatus therefor

1989-03-17

1990-10-30

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370108, 370112, H04J 306

Patent

active

049674102

ABSTRACT:
A high speed digital signal multiplexing method and apparatus are provided wherein a plurality of first higher bit rate transmission frames are provided, each first higher bit rate transmission frame being multiplexed therein with lower bit rate signals in an n-byte (n is an integer) interleave manner, and the lower bit rate signals are selectively derived from the plurality of first higher bit rate transmission frames and multiplexed into a second higher bit rate transmission frame. When a phase conflict is detected among the derived lower bit rate signals, all the data columns of at least one of the derived lower bit rate signals are given a predetermined delay by means of a shift register, and the derived signals are multiplexed into the second higher bit rate transmission frame. When a first higher bit rate transmission frame asynchronous with the system frame is detected, a pointer is derived which pointer represents a predetermined information unit within the derived lower bit rate signal. The derived pointer is inserted into a time slot corresponding to the frame pattern position of the second higher bit rate transmission frame for the lower bit rate signal. Thereafter, the derived signals are multiplexed.

REFERENCES:
patent: 4133981 (1979-01-01), Kibler
patent: 4698806 (1987-10-01), Graves et al.
patent: 4709375 (1987-11-01), Robinton et al.
patent: 4764921 (1988-08-01), Graves et al.
American National Standard, T1X1.4 Optical Rates and Formats Subworking Group, TIX1.4/87-505R2, Sep. 25, 1987, pp. 12-13, 42-47.

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