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Only in Chain Full-Duplex LU7 And Increased RU Size

IP.com Disclosure Number: IPCOM000101994D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Foss, BG: AUTHOR [+4]

Abstract

Work Stations Controllers (WSCs) provide attachment of multiple work stations to a host processor. Work stations can include dependent displays, printers, PCs running a dependent display emulator, or PCs running a PC support program. In some cases, WSCs communicate with the host processor using System Network Architecture (SNA) LU7 (the specific type of SNA). In some cases, PCs running a PC support program communicate with a host processor using SNA LU6.2. Then, if a SNA LU6.2 PC connects to a SNA LU7 WSC, SNA LU6.2 data will be carried inside SNA LU7. SNA LU7 was designed as a half-duplex protocol. This article describes a full-duplex implementation of SNA LU7 when attaching SNA LU6.2 PCs.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 59% of the total text.

Only in Chain Full-Duplex LU7 And Increased RU Size

       Work Stations Controllers (WSCs) provide attachment of
multiple work stations to a host processor.  Work stations can
include dependent displays, printers, PCs running a dependent display
emulator, or PCs running a PC support program.  In some cases, WSCs
communicate with the host processor using System Network Architecture
(SNA) LU7 (the specific type of SNA).  In some cases, PCs running a
PC support program communicate with a host processor using SNA LU6.2.
Then, if a SNA LU6.2 PC connects to a SNA LU7 WSC, SNA LU6.2 data
will be carried inside SNA LU7.  SNA LU7 was designed as a
half-duplex protocol.  This article describes a full-duplex
implementation of SNA LU7 when attaching SNA LU6.2 PCs.

      The SNA LU7 BIND has been enhanced such that the host processor
will set byte 7 of the BIND command to a '01'X (versus the previous
'81'X) if the work station is a PC running PC support.  The '01'X
indicates the host is capable of full-duplex LU7.  The WSC will
respond with either a '01'X in the BIND response if full-duplex is
supported or the previously defined '81'X to indicate half-duplex
support.  This design assumes either the host or WSC could be
down-level resulting in four combinations:
-  Down-level host/down-level WSC: BIND = '81'X and BIND response =
'81'X; half-duplex LU7 is used
-  Down-level host/new WSC: BIND = '81'X and BIND response = '81'X;
half-duplex LU7 is used
-  New host/down...