Browse Prior Art Database

Telecommunications Tester With Bit Rate Generator

IP.com Disclosure Number: IPCOM000086604D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Johnson, CT: AUTHOR [+2]

Abstract

In the testing of communications from one computer to another computer or to a peripheral device, it has been the custom to use a modem to generate the bit-rate timing signals. This ties up a number of expensive devices, one for each of the bit rates to be tested. The apparatus shown above will generate all of the conventional bit rates, is inexpensive and portable, and can serve a number of processors at the same time.

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 66% of the total text.

Page 1 of 2

Telecommunications Tester With Bit Rate Generator

In the testing of communications from one computer to another computer or to a peripheral device, it has been the custom to use a modem to generate the bit-rate timing signals. This ties up a number of expensive devices, one for each of the bit rates to be tested. The apparatus shown above will generate all of the conventional bit rates, is inexpensive and portable, and can serve a number of processors at the same time.

This tester comprises frequency generating circuits for all conventional bit rates. These circuits include an oscillator 1 at 3.6MHz followed by a divide-by- 500 circuit 2 to provide a signal at 7200Hz. The 7200Hz output of divider 2 is then divided by two in divider 3 to supply a 3600Hz signal. A second oscillator 4 at 4MHz has its output divided by 2000 in divider 5 to provide a 2000Hz signal. A third oscillator 6 at 9.6MHz has its output divided in divider 7 to generate a 9600Hz signal. A four-stage binary counter 8 receives the 9600Hz signal and has outputs of 4800 Hz, 2400Hz, 1200Hz and 600Hz.

The tester also has eight output sections 10, one of which is shown in detail. In this section 10, a nine position switch 11 has eight of its contacts connected to the eight signal output lines and its last contact connected to an external terminal 12, which may be supplied an external signal of a frequency not provided by the three oscillators.

A connector having the E1A interface for a communication li...