SDH rejustification

Details SDH rejustification SDH rejustification

1991-05-29

1992-12-15

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370102, 370105, 3701051, H04J 306

Patent

active

051723760

ABSTRACT:
The invention concerns a method of pointer processing a digital TDM data stream at a node of a synchronous SDH transmission network so as to justify the data stream on transmission, the data stream having a specified line frequency and being composed of frames, each frame containing a reference word, and the node of the transmission network having a node frequency, the method comprising storing the incoming data stream in a buffer store at the node, using the line reference of the incoming data stream to extract a data pointer from the data stream for each frame, which data pointer indicates the location of the reference word of that frame in the buffer store, and characterized in that a timing pointer is extracted from the incoming data stream utilizing the line reference and a line clock the frequency of which is a multiple of the line reference; the timing pointer so extracted is converted into a reference value by utilizing the node reference and a node clock; the reference value is utilized to generate a node timing pointer; the node timing pointer is compared with a read address and data pointer; and read-out from the buffer store is justified in accordance with the results of the comparison.

REFERENCES:
patent: 3597552 (1971-08-01), Goto
patent: 3646271 (1972-02-01), Shigaki
patent: 4764942 (1988-08-01), Shigaki et al.
patent: 4811340 (1989-03-01), McEachern et al.
patent: 5113395 (1992-05-01), Murakami et al.

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