Browse Prior Art Database

Adjustable Dual Priority Interrupt Switching Method

IP.com Disclosure Number: IPCOM000113506D
Original Publication Date: 1994-Aug-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Feeney, JW: AUTHOR [+2]

Abstract

Disclosed is a method for improving the performance in real time, multi-stage switching networks. In real time networks, where high priority connections are permitted to break low priority connections immediately, a problem of inefficiency can arise. If a low priority message is almost complete, it is inefficient to terminate the message and have it retried from the start at a later time.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Adjustable Dual Priority Interrupt Switching Method

      Disclosed is a method for improving the performance in real
time, multi-stage switching networks.  In real time networks, where
high priority connections are permitted to break low priority
connections immediately, a problem of inefficiency can arise.  If a
low priority message is almost complete, it is inefficient to
terminate the message and have it retried from the start at a later
time.

      The solution to the inefficiency problem is to provide an
intelligent switch capable of implementing two priorities (high and
low) plus having the ability to distinguish between low priority
messages that should be interrupted or cancelled by high priority
messages, and  those that are near completion.  The new switch can
make any of the three intelligent decisions as follows:

1.  If a connection is requested at a switch stage and the connection
    is not being used or requested by a high priority transfer, the
    requested connection is established regardless of whether the
    requesting transfer is high or low priority.

2.  If a connection is requested at a switch stage and the connection
    is previously being used by a high priority transfer or a low
    priority transfer nearing completion, the requested connection is
    not established.  Instead, the new connection request is held and
    established as soon as the present connection is broken.

3.  If a connection is requested at a switch stage and the connection
    is being...