Browse Prior Art Database

Group Broadcast Addressing Mechanism for a Loop Type Data Transmission Network

IP.com Disclosure Number: IPCOM000045428D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Lanier, CS: AUTHOR [+4]

Abstract

This mechanism enables messages to be transferred to all stations in a group of stations connected to a multiple-station data transmission loop. This is accomplished by removing the restriction of requiring a response from the first station in the group to receive the message.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 62% of the total text.

Page 1 of 2

Group Broadcast Addressing Mechanism for a Loop Type Data Transmission Network

This mechanism enables messages to be transferred to all stations in a group of stations connected to a multiple-station data transmission loop. This is accomplished by removing the restriction of requiring a response from the first station in the group to receive the message.

Fig. 1 shows a data communications loop 10 having a relatively large number of user stations 12 connected in the loop. The individual stations 12 are normally addressed by placing a multiple bit station address field at the beginning of a message, the binary coding of the address field identifying the particular stations to be addressed.

Fig. 2 shows an improved address field format for use in providing the desired group broadcast addressing. A fixed number of higher-order bits S are assigned for the purpose of addressing the individual stations on an individual one-at-a-time basis. The number of such bits is chosen to take into account the maximum number of stations that will be permitted on the transmission loop. For the illustrated example, five such S bits will allow for the individual addressing of up to 32 stations.

The remaining lower-order bits G of the address field are used to provide a group address, the binary code value of the G bits representing a group address number. Thus, the G bits would have a code value of "001" to address the group 1 stations and a code value of "010" to address the stations...