Patent Number: 6,167,027

Title: Flow control technique for X.25 traffic in a high speed packet switching network

Abstract: A preventive X.25 flow control mechanism for use in a high speed packet switching network where calls are multiplexed on network trunks with each connection using a reserved amount of the total bandwidth. X.25 data terminal equipments access the network via access nodes. Each access node includes a Leaky Bucket component which maintains a refillable token pool. Each time an incoming packet is received by the leaky bucket component, the number of available tokens is compared to two predetermined threshold values. If the number of tokens is less than the low threshold, acknowledgments of received packets are stopped, inducing an interruption of packets transmitted by the emitting attached X.25 terminals. Interrupting packet transmission will lead to a regeneration of the number of tokens in the token pool. If the number of tokens reaches the high threshold, acknowledgments are again generated to restore packet transmissions. The first and second thresholds are greater than zero, reducing the chances that a packet will be marked as being discardable.

Inventors: Aubert; Denis (Saint Paul de Vence, FR), Chabannet; Anne (Le Bar sur Loup, FR), Legoll; Jean-Jacques (Cagnes sur Mer, FR), Plattier; Edmond (Antibes, FR), Szczap; Michel (La Gaude, FR), Mariotti; Rene (Nice, FR)

Assignee: Cisco Technology, Inc.

International Classification: H04L 12/28 (20060101); H04L 12/56 (20060101); H04L 005/12 ()

Expiration Date: 12/26/2017