Browse Prior Art Database

Automatic Wrap Tests (Autowrap) for 5494

IP.com Disclosure Number: IPCOM000109541D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 1 page(s) / 51K

Publishing Venue

IBM

Related People

Ellis, B: AUTHOR [+4]

Abstract

Wrap tests are invoked by software activating relays in the external communication cables. This logically disconnects the DCE from the DTE, and connects the DTE's drivers to its receivers. This allows software to test that data gets transmitted out of the card's drivers, onto the communication cable, through the relays at the end of the cable, and back through the receivers. In this way, the wires and logic of the cable, and the logic of the card is fully tested. The DCE is also fully isolated from this testing.

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Automatic Wrap Tests (Autowrap) for 5494

       Wrap tests are invoked by software activating relays in
the external communication cables.  This logically disconnects the
DCE from the DTE, and connects the DTE's drivers to its receivers.
This allows software to test that data gets transmitted out of the
card's drivers, onto the communication cable, through the relays at
the end of the cable, and back through the receivers.  In this way,
the wires and logic of the cable, and the logic of the card is fully
tested.  The DCE is also fully isolated from this testing.

      There is no action required on the part of the operator.  No
manipulation of the cables, such as disconnecting from the DCE, or
installing a wrap plug are required.  There is also no requirement
for the operator to invoke the routine manually; software can perform
the tests without intervention.

      This wrap test is invoked every time the machine is powered up.
This test is also invoked whenever software has determined that there
may be problems communicating with the host system.  The wrap test is
run, and if no problem is found, the machine is restored to its
previous state and an attempt is made to reestablish communications
with the host.

      By doing this, the machine is verified for proper operation
automatically at every possible time.  Since communications were
interrupted by the problem, the communications line is down, so
invoking wrap tests has no impact on the system...