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Distributed Packet Transmission System

IP.com Disclosure Number: IPCOM000034249D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 3 page(s) / 26K

Publishing Venue

IBM

Related People

Corr, FP: AUTHOR

Abstract

This article describes a contention system which may be very useful where the network provides extremely high bit rates with relatively low utilization. The basic network is illustrated in the drawing and utilizes a combiner to which each of the devices is connected by unidirectional receive and transmit paths. The combiner does not store any packets. It simply repeats everything it sees on an incoming fiber line to all of the outgoing fiber lines. In the event two packets arrive at the same time, garbling will occur. However, the packet is allowed to be sent in garbled form on the outgoing fibers. Each of the terminals converts transmit packets to a distributed packet format which will be described below.

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Distributed Packet Transmission System

This article describes a contention system which may be very useful where the network provides extremely high bit rates with relatively low utilization. The basic network is illustrated in the drawing and utilizes a combiner to which each of the devices is connected by unidirectional receive and transmit paths. The combiner does not store any packets. It simply repeats everything it sees on an incoming fiber line to all of the outgoing fiber lines. In the event two packets arrive at the same time, garbling will occur. However, the packet is allowed to be sent in garbled form on the outgoing fibers. Each of the terminals converts transmit packets to a distributed packet format which will be described below. At the receiving side the terminals check incoming packets for its own address, the check characters within the packet to see if it contains valid data and the number of the packet within the distributed packet format. Packets are sent by each terminal on a fiber dedicated to that terminal to the combining unit. The combiner takes all of the incoming packets, combines them, and transmits them on every outgoing fiber to all terminals. Each terminal looks at every packet it receives and accepts those addressed to it after it verifies that the check character is correct. The primitive system described herein works well if traffic is low enough that messages (packets) do not collide in the combiner; and if the transmission error rate is low enough to make retransmission infrequent, the gist of the system is to use the system in the figure with distributed packets. Instead of sending a single packet in the conventional way, a terminal or device sends a distributed packet where the packet is repeated as many as n times. Each of the n copies contains, in addition to a common sequence number within the packet, an additional number which indicates which of the n packets it is. Thus, the n repeated packets form a distributed packet. The delays between the packets forming a distributed packet are selected for each terminal in such a way that, if there is a collision with...