04006461 is referenced by 12 patents and cites 3 patents.

The system includes a passive station dedicated to the control and acquisition of data of an electronic apparatus and arranged for communication with a central station over a non-dedicated voice band-width communication link with connections being established from the central station. The passive station includes means to initiate a call-out operation under alarm conditions, but the communication is limited to the establishment of the connection and the transmission of a ready signal to the central station inviting the central station to issue a command to the passive station to transmit information.

Title
System for transmitting operating condition data from a passive station to a central station
Application Number
5/546461
Publication Number
4006461
Application Date
February 3, 1975
Publication Date
February 1, 1977
Inventor
Arthur E Fuerherm
White Plains
NY, US
J Roland Coulter
Harrison
NY, US
Agent
Curtis Ailes
Assignee
Tull Aviation Corporation
NY, US
IPC
H04Q 9/00
View Original Source