Multiplex communications – Data flow congestion prevention or control – Control of data admission to the network
Patent
1997-11-12
2000-09-19
Kizou, Hassan
Multiplex communications
Data flow congestion prevention or control
Control of data admission to the network
370395, 370236, 370413, G01R 3108, H04L 1228
Patent
active
061222518
ABSTRACT:
To realize the traffic control for controlling congestion in an ATM switchboard and assuring the throughput of VCs using the same output port.
A buffer occupancy value measuring section measures the queue length of each of the output port buffers and stores the data in a buffer occupancy value table. A back-pressure outputting section outputs a transmission restart signal when a queue length in the buffer occupancy table is equal to or less than a fist threshold, a transmission control signal when the queue length is between the first threshold and a second threshold, and a transmission stop signal when the queue length is equal to or more than the second threshold as back pressure signal respectively. A cell transmission control section transmits an ATM cell without comparing a transmission time with the present time when the instruction of a back pressure signal corresponding to a destination port indicates "restart" and transmits an ATM cell only when the transmission time is earlier than the present time if the instruction indicates "control".
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B. Mark et al., "Large Capacity Multiclass ATM Core Switch Architecture", ISS '97, XVI World Telecom Congress Proceedings, Sep. 21, 1997, pp. 417-423.
Ruixue Fan et al., "Expandable ATOM Switch Architecture (XATOM) for ATM LANs", 1994 IEEE, 1994, pp. 402-409.
Kizou Hassan
NEC Corporation
Nguyen Hanh
LandOfFree
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