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Non-Disruptive Station Address Collision Detect

IP.com Disclosure Number: IPCOM000060759D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Hockings, MA Johnson, H Romon, RF [+details]

Abstract

In a processing system with multi-dropped terminal attachments, a limited fixed number of device addresses are available for use. The described invention provides a means to detect if a device (terminal) is in current session with the host CPU, and not cause disruption to that on-going session. This allows device addresses to be shared by several devices, depending on the order in which the devices enter into an active session, after powering on. By gating the transmit pathway from protocol controller device (LPC) to the line driver module, and placing the LPC in an online state, appropriate programs can test if a response is made by another station with the same address. The hardware on the receiving side of the line is enabled, and functions as if it were "online".