Method of phase-converting frame and apparatus using same

Details Method of phase-converting frame and apparatus using same Method of phase-converting frame and apparatus using same

1990-04-11

1992-07-07

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701051, H04J 306

Patent

active

051289393

ABSTRACT:
Disclosed is a method and apparatus of phase-converting a frame, each frame containing a plurality of data, a frame synchronous signal arranged in a predetermined first relative phase position in the frame, and a pointer arranged in a predetermined second relative phase position and storing a value indicating a phase difference between the second relative phase position and the front position of the data in the frame, in which the following operations are carried out: consecutively receiving the frames; sequentially arranging a predetermined number of data among the plurality of data in the received frame in a transmission frame in accordance with a received order, and arranging the frame synchronous signal and the pointer in the received frame in the first relative phase position and the second relative phase position, the first relative phase position being independent to the second relative phase position, to form the tansmission frame; detecting a fourth relative phase position in the transmission frame, the fourth relative phase position storing a data same as a specific data arranged in a third relative phase positon in the received frame; obtaining a difference between the fourth relative phase position and the third relative phase position; and setting the difference between the value of the pointer in the received frame and the obtained phase difference as the value of the pointer in the transmission frame.

REFERENCES:
patent: 4490819 (1984-12-01), Bogen et al.
patent: 4941141 (1990-07-01), Hayano
patent: 4953163 (1990-08-01), Miyamoto et al.
Synchronous Optical Networks (SONET), Bell Communication Research, May 2, 1987, pp. 18-27, 56-65.

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