04250489 is referenced by 300 patents and cites 13 patents.

Bidirectional addressable repeaters of a power line carrier communication system each include an address recognition and a receive and transmit control logic circuit having programmable zone and address identifying states for connection in plural repeating levels defining branch paths linking a central control terminal with multiple remote terminals via a distribution line network. Each repeater retransmits an interrogation message, provides its own repeater address modification, and remains in a response-wait status. The alerted repeaters define the predetermined route of branch paths for being sequentially activated by a response message. Simplified repeater response address formats are used and each repeater modified its address data upon response message retransmission. The desired sequentially occurring repeating transmissions are assured upon retransmission of both the interrogation and response messages.

Title
Distribution network communication system having branch connected repeaters
Application Number
5/956516
Publication Number
4250489
Application Date
October 31, 1978
Publication Date
February 10, 1981
Inventor
Leonard C Vercellotti
Oakmont
PA, US
Waymon A Melvin Jr
Raleigh
NC, US
Allan A Dudash
Raleigh
NC, US
Agent
R W Smith
Assignee
Westinghouse Electric
PA, US
IPC
H04M 11/04
H04Q 9/00
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