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Multiple Frame Transmission for Single Token

IP.com Disclosure Number: IPCOM000042283D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Sy, KK: AUTHOR

Abstract

This article describes a technique which enables a station on a token ring communication system to transmit a plurality of frames without releasing a free token. Each station is fitted with a token-holding timer which is used to indicate to the transmitting station when to terminate its transmission. Also, the seventh bit in the E-delimiter is designated as the "intermediate bit." The state of the intermediate bit is used to indicate to a transmitting station when to terminate its stripping of data from the ring and go into a repeat state. Above is a sketch of the end delimiter (ED) frame. This ED is one-byte wide and forms part of the message which is transported on the ring. When the seventh bit of the ED is on, this indicates to the transmitting station that the data is the first or intermediate frame.

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Multiple Frame Transmission for Single Token

This article describes a technique which enables a station on a token ring communication system to transmit a plurality of frames without releasing a free token. Each station is fitted with a token-holding timer which is used to indicate to the transmitting station when to terminate its transmission. Also, the seventh bit in the E-delimiter is designated as the "intermediate bit." The state of the intermediate bit is used to indicate to a transmitting station when to terminate its stripping of data from the ring and go into a repeat state. Above is a sketch of the end delimiter (ED) frame. This ED is one-byte wide and forms part of the message which is transported on the ring. When the seventh bit of the ED is on, this indicates to the transmitting station that the data is the first or intermediate frame. Similarly, if the bit is off, the transmitting station is informed that this is the last frame to be stripped from the ring. The rules for implementing a multiframe architecture are as follows: Every station has a token-holding timer. It indicates the maximum number of octets that a station can transmit. A station is allowed to transmit as long as the message is less than or equal to the token-holding timer. (A message length includes PCF-1, DA, SA, and I fields.) The value of the token- holding timer is predetermined. The token-holding timer will be updated (decremented) before an end frame delimiter (EFD) is transmi...