The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1995
Filed:
Jan. 14, 1993
Anthony Jessop, Harlow, GB;
Ian J Hirst, London, GB;
Northern Telecom Limited, Montreal, CA;
Abstract
An error detecting arrangement for a digital transmission line, wherein signals are transmitted in the form nBIP, and which also provides the possibility of signal validation and a signalling channel. The output of a toggle (4) has a line spectrum at fo/2(n+1) or fo/(n+1), where fo is the line digit frequency, depending on whether the parity is odd mark or even mark. The toggle output is bandpass filtered (at 5) as appropriate and applied to envelope detector (6). Errors can be counted (at 10). The envelope detector output is low pass filtered (at 7), the output of which is an analogue measure of the error rate. The latter is compared (at 9) with a threshold BER and the result can be used for validation or providing a signalling channel (FIG. 2).