Browse Prior Art Database

Digital Interface Recorder

IP.com Disclosure Number: IPCOM000078863D
Original Publication Date: 1973-Mar-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Bird, RA: AUTHOR [+2]

Abstract

This recorder is a teleprocessing problem analysis device having recording capabilities, which will allow recording up to 9600 bits per second on all start/stop, BA-sync and store devices. For recording it is connected in series between a customer's multiplexer or terminal and the data set. Connection may be made to internal modems, if appropriate sample points are accessible.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 2

Digital Interface Recorder

This recorder is a teleprocessing problem analysis device having recording capabilities, which will allow recording up to 9600 bits per second on all start/stop, BA-sync and store devices. For recording it is connected in series between a customer's multiplexer or terminal and the data set. Connection may be made to internal modems, if appropriate sample points are accessible.

The recorded digital data is analyzed for a failure or used to exercise a terminal locally, without data being received from the "other end" or dependence on a local data set. The device can be set to provide playback data for program analysis, so that errors can be determined and located through the complete teleprocessing system.

For playback as an exerciser, the data set interface can be completely simulated by the use of a patch-panel. The operations the terminal performs under control of the recorder, will be identical to that performed when connected to the interface of a customer data set. A customer engineer can thus use prerecorded tapes and the recorder to completely check the terminal after installation.

The main elements of the adapter unit are the scrambler and descrambler circuits. The scrambler samples the status of selected interface data and clock leads. If the data lead is at a mark level, a pulse which is in-phase with the clock, is written on the tape. When the data lead is at a space level, an out-of-phase pulse is written on the tape. This method of recording provides a relatively constant number of transitions regardless of the data pattern. As the...