Browse Prior Art Database

Electronic Wrap Capability

IP.com Disclosure Number: IPCOM000107486D
Original Publication Date: 1992-Feb-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 1 page(s) / 58K

Publishing Venue

IBM

Related People

Johnson, DWJ: AUTHOR

Abstract

Disclosed is an implementation of electronic wrap capability for a remote display controller. This addresses the need to be able to automatically test the communication cable to find faults and isolate them.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 73% of the total text.

Electronic Wrap Capability

      Disclosed is an implementation of electronic wrap capability
for a remote display controller.  This addresses the need to be able
to automatically test the communication cable to find faults and
isolate them.

      Previous versions had manual switches at the end of the cable.
This required the customer engineer to manually find the end of the
cable, and switch in and out of wrap mode. The cable also had to be
disconnected from the communications equipment before the test was
done.

      A separate wrap plug was also available that had slightly
different wrap paths.

      Single-pole, double-throw electrically switched relays were
used in place of the manual wrap switches.  These performed all the
necessary wrapping of transmit to receive circuits, and disconnection
from the communications equipment.  A signal from the processor
controls when the cable is in wrap mode.  Power-off termination was
accomplished by using the normally closed position of the relays to
connect during power off, and normal operation.

      The differential interfaces supported have two separate
circuits.  Each of these are separately wrapped to increase fault
isolation.

      Another feature implemented in the cable is using a common
receiver for all electrical interfaces and differentiating them
through the termination included in the cable.  In this way, a common
circuit for the receivers is possible for all supported electrical
...