US 7,321,617 B2
Data communication system with self-test feature
Jon David Garlett, Wappingers Falls, N.Y. (US); Victor Moy, Poughkeepsie, N.Y. (US); and Michael A. Sorna, Hopewell Junction, N.Y. (US)
Assigned to International Business Machines Corporation, Armonk, N.Y. (US)
Filed on Jul. 09, 2002, as Appl. No. 10/64,387.
Prior Publication US 2004/0008762 A1, Jan. 15, 2004
Int. Cl. H03B 17/00 (2006.01); H04L 7/02 (2006.01)
U.S. Cl. 375—224  [375/360] 10 Claims
OG exemplary drawing
 
1. A data communication system comprising:
a random digital sequence generator capable of selectively issuing a series of digital 1 and 0 bits in a random sequence; and
an activate circuit coupled to an output of the sequence generator and which responds to receipt of a pre-set sequence of digital bits from the sequence generator by initiating a self-test operation by which the data communication system dynamically adjusts, on a random basis, a time period in which data windows are present within transmitting data signals, wherein the pre-set sequence indicates transmission of test data and addition of jitter to the system to perform the self-test operation.