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Terminal End To End Test Procedure

IP.com Disclosure Number: IPCOM000087020D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 5 page(s) / 35K

Publishing Venue

IBM

Related People

Busch, DG: AUTHOR [+2]

Abstract

Synchronization of terminals and the detection of intermittent errors in the communication link are extremely difficult to diagnose without special test equipment and communication skills. This procedure allows an operator to test for these errors without the extensive use of special tools or skills. The tests allow the operator to observe hardware and link statistics over an extended period of time to ensure that all intermittent errors have been provided adequate time to occur. In addition, the tests permit the operator to check for errors at the communications adapter level, the modem level or the link level, as illustrated in the drawing.

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Terminal End To End Test Procedure

Synchronization of terminals and the detection of intermittent errors in the communication link are extremely difficult to diagnose without special test equipment and communication skills. This procedure allows an operator to test for these errors without the extensive use of special tools or skills. The tests allow the operator to observe hardware and link statistics over an extended period of time to ensure that all intermittent errors have been provided adequate time to occur. In addition, the tests permit the operator to check for errors at the communications adapter level, the modem level or the link level, as illustrated in the drawing.

The tests described below are capable of diagnosing line or synchronization problems between two communicating terminals or synchronization problems in the communicating terminal itself, for example, adapter or modem problems which are local. Actually described are six versions of the tests which are available. The first test is designed to test the data path through the communication adapter only. The second test extends the first test through the local modem. The third and fourth tests are used together to create a data link where the third test is provided in the transmitting station and the fourth test is provided in the receiving station. The fifth and sixth tests are similar to the third and fourth tests, but are half speed versions of these tests.

Test number 1 is designed to wrap a constant EBCDIC sync pattern through the communications adapter. This test services both transmit and receive data at the adapter. Error counts are displayed on the panel indicators I as well as the on-line send and receive indicator I'. Intentional errors can be introduced to verify the proper operation of the receive logic. The adapter must be set to the wrap mode in which the output and input are directly connected for this test. This may be accomplished in many ways, such as a manual switch, or under some control input from an input device connected to the terminal. The test is started by depressing the start button C. When the data terminal ready (DTR) becomes active, the on-line indicator will go from a flashing condition to a solid on condition. If the data set ready (DSR) does not come up, then depressing the cancel button C will return control to the nonresident controller. After DSR comes up, the request to send (RTS) will be brought up. The control program for the terminal waits for either clear to send (CTS) to go active or a cancel key to be depressed. If the cancel key is depressed, the control is returned to the nonresident controller. This operating procedure provides a mechanism for exiting the test if CTS or DSR do not become active. If CTS does become active, the test will begin to operate. Once the test is active, the panel switches are redefined to control the test.

In addition, the communications indicator and the top row of indicators are redefined t...