04943973 is referenced by 203 patents and cites 7 patents.

A spread-spectrum signal which conveys identifying information for an associated information signal is superimposed on the associated signal and transmitted therewith. Such identifying information distinguishes between voice and data information signals and between different types of data information signals. Such identification can be used for a variety of purposes within a communications network, such as facility and equipment selection, equipment disablement and bypass, setting communications parameters, e.g., speed, and inhibiting communications upon fault detection.

Title
Spread-spectrum identification signal for communications system
Application Number
7/331933
Publication Number
4943973
Application Date
March 31, 1989
Publication Date
July 24, 1990
Inventor
Jean Jacques Werner
Holmdel
NJ, US
Agent
David R Padnes
Assignee
AT&T Company
NJ, US
IPC
H04K 9/00
View Original Source