Browse Prior Art Database

Connectivity Improvement for Peripheral Devices in Host and Terminals

IP.com Disclosure Number: IPCOM000105235D
Original Publication Date: 1993-Jul-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Kamijo, N: AUTHOR [+2]

Abstract

Disclosed is a method for improving the connectivity of peripheral devices such as printers and displays in a host and terminals system, to be connected on a single twinaxial loop. According to the disclosed feature, two times as many as the conventional maximum numbers of logical units can be connected to one twinaxial loop.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 67% of the total text.

Connectivity Improvement for Peripheral Devices in Host and Terminals

      Disclosed is a method for improving the connectivity of
peripheral devices such as printers and displays in a host and
terminals system, to be connected on a single twinaxial loop.
According to the disclosed feature, two times as many as the
conventional maximum numbers of logical units can be connected to one
twinaxial loop.

      In the conventional technique, the display terminal
communication adaptor starts the data reception after the reception
of Quiesce pattern (5-bit length) and Code violation (3-bit length)
as shown in Fig. 1 (a).  The conventional adaptor detects the command
and the data from the workstation controller when the detection
signal in Fig.1 (a) is received.

      The display terminal frame format is 16-bit wide and the 3 bits
therewith in are used for the station address.  Therefore, 7 logical
units at maximum can be connected on the twinaxial loop.

      The peripheral devices which have multi-LU (Logical Unit) are
already known, then the numbers of actual devices which can be
connected on a loop is physically limited.  Without additional WSC's
(Workstation controller), the numbers of physical devices can be
increased by using this method.

      Code violation is unique pattern at the data transmission, and
considered to achieve frame synchronization between a sender and a
receiver and to have better noise immunity.  Using these merits, when
the ad...