Data collection network apparatus and method

• US 5,548,633 A
• Filed: 04/26/1994
• Issued: 08/20/1996
• Est. Priority Date: 01/03/1991
• Status: Expired due to Fees

• Current Assignee: Sasktel
• Original Assignee: Sasktel
• Inventors: Kujawa, Kim, Jarzab, Michel, Robson, Homer, Kirchner, Erich
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Shankar, Vijay
• Application Number:
  US08/233,498
• Time in Patent Office: 847 Days
• Field of Search: 370/94.1, 370/94.2, 370/76, 379/93, 379/94, 379/106, 379/107, 379/8
• US Class Current: 379/93.11
• CPC Class Codes: H04M 11/002 with telemetering systems telemetering in general G08C

Abstract

A data communications system which comprises at least one group of subscriber data interface elements, with each interface element having at least one data input port and a data output port, and each output port being electrically connectable to a subscriber line of the telephone network to transmit data thereon without interfering with any telephone service that may be present on these subscriber line. A network data interface element, for each group of subscriber data interface elements, being located within a short distance from the farthest subscriber data interface element. Each subscriber data interface element having a data input port and a data output port, and each input port being electrically connectable to a subscriber line of the telephone network and in communication with these subscriber data interface elements thereover. A data collection unit having a data storage mechanism and a plurality of data input ports, with each data input port being connectable to the data output port of a corresponding network data interface element and capable of communicating therewith for collecting and storing the data received from these network data interface elements and assembling the data into a data frame. A data communications network for carrying the data frames produced by the data collection unit to at least one data processing facility.

Claims

1. A data communications system comprising:

a plurality of subscriber data interface elements each having a data input port and a data output port for assembling a data frame, said data output port being electrically connectable to a telephone line, to continuously transmit said data frame thereon, using a carrier signal whose frequency is higher than the voice band;

a plurality of network data interface elements located within a short distance from the farthest subscriber data interface element, a said network data interface elements having a data input port and a data output port, said data input port being electrical connectable to said telephone line and in communication with an associate subscriber data interface element thereover;

a data collection unit having a data storage means for connection to a data output port of a corresponding network data interface element of said plurality of network data interface elements and capable of communicating therewith, for collecting and storing the data frames received from said plurality of network data interface elements;

a data communications network connected to said data collection unit for assembling an addressed data packet from the data frames received from said data collection unit; and

at least one data processing facility in connection with a plurality of service companies and with said data network, for processing said addressed data packet, extracting said subscriber data and transferring said subscriber data to a service company indicated in said addressed data packet.

2. A data communications system as claimed in claim 1 wherein said data frame comprises a predefined set of 8 bit data sequences, including:

a link protocol data sequence;

a network protocol data sequence;

a discrete number of information data sequences; and

a frame check data sequence.

3. A data communications system as claimed in claim 1 wherein said data collection unit includes a configurable data processing means for processing the data frames for each data input port, said data processing means being configurable to:

forward each data frame as data is received, or

forward a data frame only when said data frame is different from a last received data frame, or

forward a data frame only on receipt of an instruction to forward the data frame.

4. A data communication system as claimed in claim 1 wherein said data communication network comprises an X.25 packet switched network such that each data frame is converted into said addressed data packet by the introduction of connection, address and error correction octets in accordance with X.25 standard.

8. A data communications system as claimed in claim 1 wherein said data collection unit includes a configurable data processing means for processing the data frames for each data input port, said data processing means being configurable to:

forward each data frame as data is received, or

forward a data frame only when said data frame is different from a last received data frame, or

forward a data frame only on receipt of an instruction to forward the data frame.

9. A data communications system as claimed in claim 1 wherein the length of said telephone line between said farthest subscriber data interface element and the corresponding network data interface element is shorter than approximately 2 kilometers.

5. A data communication system comprising:

a plurality of subscriber data interface elements each having a data input port and a data output port for assembling a data frame, said data output port being electrically connectable to a telephone line, to continuously transmit said data frame thereon, using a carrier signal whose frequency is higher than the voice band;

a plurality of network data interface elements located within a short distance from the farthest subscriber data interface element, a said network data interface elements having a data input port and a data output port, said data input port being electrical connectable to said telephone line and in communication with an associate subscriber data interface element thereover;

a data collection unit having a data storage means for connection to a data output port of a corresponding network data interface element of said plurality of network data interface elements and capable of communicating therewith, for collecting and storing the data frames received from said plurality of network data interface elements;

a data communications network connected to said data collection unit for assembling an addressed data packet from the data frames received from said data collection unit;

at least one data processing facility in connection with a plurality of service companies and with said data network, for processing said addressed data packet, extracting said subscriber data and transferring said subscriber data to a service company indicated in said addressed data packet; and

a network control monitor interconnected to said data communications network to monitor traffic on said data communications network and for communicating with said data collection unit and said data processing facilities to set configuration parameters of said data processing facilities.

6. A data communications system as claimed in claim 5 wherein said data frame comprises a predefined set of 8 bit data sequences, including:

a link protocol data sequences;

a network protocol data sequence;

a discrete number of information data sequences; and

a frame check data sequence.

7. A data communication system as claimed in claim 5 wherein said data communication network comprises an X.25 packet switched network such that each data frame is converted into said addressed data packet by the introduction of connection, address and error correction octets in accordance with X.25 standard.

10. A data communications system as claimed in claim 5 wherein the length of said telephone line between said farthest subscriber data interface element and the corresponding network data interface element is shorter than approximately 2 kilometers.