ATM cell switching apparatus having a control cell bypass route

Details ATM cell switching apparatus having a control cell bypass route ATM cell switching apparatus having a control cell bypass route

1995-12-15

1997-09-02

Olms, Douglas W.

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

370410, 370528, H04L 1256

Patent

active

056639597

ABSTRACT:
An ATM cell switching apparatus which prevents degradation of user cells in the ATM switch and preserve the quality of control cells, even upon increase in the control cells. Control cell discriminator 2.sub.1 discriminates whether the cells on the input cell highways 1.sub.1 are control cells or user cells, and output control cell dropping instruction signal 3.sub.1 when the cells are discriminated as control cells. Control cell dropper 4.sub.1 distributes the user cells onto the cell highways 5.sub.1 and the control cells onto the input control cell highway 6.sub.1. Control cell processing unit 8 performs a termination of the control cells and processes necessary operation ralating to the control cells. The control cells to be output are temporarily stored in the control cell FIFO 13.sub.1, and inserted into an idle cell position in the switch output cell highway 10.sub.1 when an idle cell is appeared. If no idle cell is available, the idle cell output instruction signal 14.sub.1 is provided to the ATM switch to stop user cell outputting and to output idle cells for sweeping out control cells stacked in the control cell FIFO 13.sub.1.

REFERENCES:
patent: 5341376 (1994-08-01), Yamashita
patent: 5440565 (1995-08-01), Miyamoto et al.
patent: 5457700 (1995-10-01), Merchant
patent: 5509001 (1996-04-01), Tachibana et al.
patent: 5511065 (1996-04-01), Yonehara

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