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Browse Prior Art Database

Diagnostic Loop/Wrap Card for Multiple Line Terminal Adapter

IP.com Disclosure Number: IPCOM000075832D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 4 page(s) / 87K

Publishing Venue

IBM

Related People

Crooks, TL: AUTHOR [+2]

Abstract

The diagnostic card A has a loop test end L and a wrap test end W which are, respectively, used for connecting various signals together for providing a capability of running external loop tests on individual communication lines or wrap tests on adjacent pairs of communication lines of a multiple line terminal adapter (MLTA). The MLTA is a teleprocessing adapter, interfacing between a central processing unit and remote terminals by the communication lines.

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Diagnostic Loop/Wrap Card for Multiple Line Terminal Adapter

The diagnostic card A has a loop test end L and a wrap test end W which are, respectively, used for connecting various signals together for providing a capability of running external loop tests on individual communication lines or wrap tests on adjacent pairs of communication lines of a multiple line terminal adapter (MLTA). The MLTA is a teleprocessing adapter, interfacing between a central processing unit and remote terminals by the communication lines.

Card A is of electrically insulating material and, on its loop test end L, it has terminals B02 - B13 and D02 - D13. Card A on its wrap test end W has terminals DD02 - DD13 and BB02 - BB13.

The terminals B02 - B13 and the terminals DD02 - DD13 are on the same face but on opposite ends of the card. Terminals B02 and B03, terminals B05 and B06, terminals B07 and B09, and terminals B10 and B11 are connected together as shown. A mirror image of these connections is provided with terminals D02 - D13, terminals D12 and D13 being connected together and similar connections being made between terminals D09 and D10. terminals D06 and D08, and terminals D04 and D05. Terminals DD02 and BB04 are connected together, and connections are made between the other BB and DD terminals as shown. It will be noted that the DD terminals to which these connections are made, are in mirror image positions with respect to the BB terminals to which the connections are made.

In order to make a loop test, the loop test end L of card A is inserted or plugged between a pattern of terminals b and d making respective electrical connection with terminals B02 - B13 and D02 - D13. The symmetrical connections between the terminals of the card allow it to be plugged in without designating a top or bottom side. For each of the loop tests, card A connects the outputs from a line of the MLTA back to inputs of that line so that the MLTA functions as if it were communicating with a remote terminal. For wrap tests, card A has its wrap test end W plugged between terminals b and d making respective electrical connection with terminals BB02 - 13 and DD02 - 13, and connects the output from a line from the MLTA to the input of an adjacent line and vice versa so that the two lines can actually communicate with one another. Card A is capable of making the various connections shown in Fig. 4, and in this figure the terminals connected by card A for the purpose of the various tests carry the following signals:

DTR - Data Terminal Ready (This signal is transmitted from the MLTA to the modem on a particular line indicating that the MLTA is enabled.)

DSR - Data Set Ready (This is the return signal from the modem indicating that the modem is ready.)

RTS - Request To Send (This is the signal indicating that the MLTA wants to send a message.)

CTS - Clear To Send (This signal is transmitted by...