Virtual channel converter and VCC table access method

Details Virtual channel converter and VCC table access method Virtual channel converter and VCC table access method

1995-12-29

1997-11-25

Hsu, Alpus H.

Multiplex communications

Diagnostic testing

Of a switching system

370392, 370399, 370418, 34082552, H04L 1256

Patent

active

056919778

ABSTRACT:
In a data access device for writing into or read from a data conversion table on the basis of a clock signal extracted from a cell being transferred over a line, a clock signal generator of the invention generates a second clock signal which differs from the first clock signal extracted from an incoming cell. A write/read control unit writes data into or reads data for maintenance from the data conversion table on the basis of either the first clock signal or the second clock signal when the line is normal. In the event of the occurrence of a failure in the line, on the other hand, the write/read control circuit permits the data conversion table to be written into or read from for maintenance on the basis of the second clock signal.

REFERENCES:
patent: 3725593 (1973-04-01), Palombari
patent: 4803681 (1989-02-01), Takahashi
patent: 5062106 (1991-10-01), Yamazaki et al.
patent: 5084867 (1992-01-01), Tachibana et al.
patent: 5119369 (1992-06-01), Tanabe et al.
patent: 5271010 (1993-12-01), Miyake et al.
patent: 5295134 (1994-03-01), Yoshimura et al.
patent: 5313453 (1994-05-01), Uchida et al.

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