Browsing by Author "Cheng, YJ"

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Design and performance evaluation of a distributed knockout switch with input and output buffers
(1996-06-01)
Cheng, YJ
;
Lee, TH
;
Shen, WZ
;
電子工程學系及電子研究所
;
電信工程研究所
A nonblocking ATM switch with input and output buffers is proposed and its performance is evaluated. The proposed switch is a modified version of an existing distributed-knockout-switch. In the proposed switch architecture, an input port with a nonempty queue always sends a cell to the switch at the beginning of each time slot. The cell sent out from an input port reaches either its destination output port (if it wins the contention) or a different input port (if it loses). A priority scheme is adopted to preserve service-cell sequencing. A cell is discarded if it loses a predetermined number of consecutive contentions. A modified architecture which can provide multicast service is also presented. Simulations are performed to evaluate the proposed switch architecture under both uniform- and hot-spot nonuniform-traffic models.
Design and performance evaluation of a distributed knockout switch with input and output buffers
(1996-06-01)
Cheng, YJ
;
Lee, TH
;
Shen, WZ
;
電子工程學系及電子研究所
;
電信工程研究所
A nonblocking ATM switch with input and output buffers is proposed and its performance is evaluated. The proposed switch is a modified version of an existing distributed-knockout-switch. In the proposed switch architecture, an input port with a nonempty queue always sends a cell to the switch at the beginning of each time slot. The cell sent out from an input port reaches either its destination output port (if it wins the contention) or a different input port (if it loses). A priority scheme is adopted to preserve service-cell sequencing. A cell is discarded if it loses a predetermined number of consecutive contentions. A modified architecture which can provide multicast service is also presented. Simulations are performed to evaluate the proposed switch architecture under both uniform- and hot-spot nonuniform-traffic models.
Fault diagnosis of a distributed knockout switch
(1998-08-01)
Cheng, YJ
;
Lee, TH
;
Shen, WZ
;
電子工程學系及電子研究所
;
電信工程研究所
The distributed knockout switch has multiple paths between any input and output pair and thus is inherently robust to faults without the need of adding any additional switch elements. However, to achieve fault tolerance, one has to first detect and locate the faults. The authors present an efficient fault diagnosis procedure to detect, locate. and identify the fault type of single switch element faults for the switch element array of the distributed knockout switch. To facilitate fault diagnosis, the operation of switch elements is slightly modified. The diagnosis procedure can locate most single switch element faults in two phases. Faults which cannot be located in two phases can always be located in a third phase. Binary search algorithms are developed to locate some kinds of single switch element faults in the third phase.