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Unique Algorithm to Reconnect SNA LU6.2 Transactions

IP.com Disclosure Number: IPCOM000034197D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Barrett, J: AUTHOR [+4]

Abstract

A method is described which: 1. Reconnects SNA local and remote transactions based on a special conversation correlator for fast performance; 2. Offers security protection for invalid access to a SNA transaction; and 3. Offer an algorithm to create a unique conversation correlator. A local SNA Transaction Program (TP) can communicate with a remote transaction program via the SNA LU6.2 protocol. When a local TP communicates with the remote TP, a conversation is created. For the local TP, there is a Resource Control Block (RCB) associated with it. Likewise, on the remote end, there will be a RCB associate with the remote TP. The SNA LU6.2 allows the local TP to be disconnected from the remote TP temporarily and to be reconnected some time later.

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Unique Algorithm to Reconnect SNA LU6.2 Transactions

A method is described which:

1. Reconnects SNA local and remote transactions based on a

special conversation correlator for fast performance;

2. Offers security protection for invalid access to a SNA

transaction; and

3. Offer an algorithm to create a unique conversation correlator. A local SNA Transaction Program (TP) can communicate with a remote transaction program via the SNA LU6.2 protocol. When a local TP communicates with the remote TP, a conversation is created. For the local TP, there is a Resource Control Block (RCB) associated with it. Likewise, on the remote end, there will be a RCB associate with the remote TP. The SNA LU6.2 allows the local TP to be disconnected from the remote TP temporarily and to be reconnected some time later. In order to reconnect SNA transactions, a unique Conversion Correlator (CC) must be assigned to each conversation (between the local and remote TP). The maximum length for the CC is 8 bytes. A unique format is defined for the CC as follows: byte 0: Length of the CC

byte 1 - 3

bit 0: Local LU or Remote LU indicator.

bit 1 - 31: Instance identifier.

byte 4 - 7: address of the RCB assigned to the conversation. Since the address of the RCB is unique within the system, the CC is unique. All RCBs created for conversations running with a LU-LU pair will be chained together. The CC is to be generated by the TP initiating the conversation. When a conversation from the remote LU re...