Method and arrangement for transmitting data between a central data station and a plurality of data terminals in a local area network

• US 5,107,260 A
• Filed: 02/22/1990
• Issued: 04/21/1992
• Est. Priority Date: 02/24/1989
• Status: Expired due to Fees

• Current Assignee: Siemens Nixdorf Informationssysteme AG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Meissner, deceased, Holger, Stoerzbach, Werner
• Primary Examiner(s): Yusko, Donald J.
• Assistant Examiner(s): Magistre, Dervis
• Application Number:
  US07/482,964
• Time in Patent Office: 789 Days
• Field of Search: 340/825.52, 340/825.08, 340/825.10, 340/825.07, 340/825.15, 340/825.18, 340/825.06, 370/56, 370/59, 370/63, 370/64, 370/85.8, 370/94.1, 370/112, 370/61
• US Class Current: 370/428
• CPC Class Codes: H04L 12/525 involving a stored program control

Abstract

Method and arrangement for transmitting data between a central data station and a plurality of data terminal equipment in a local area network. In order to achieve fast data transmission for simultaneous data lines in a local area network between a central data station and a plurality of data terminals upon interposition of a network node, whereby the known HDLC (high level data link control) data transmission procedure is combined with a data transmission method for data transmission wherein every status change of the binary coded data has a transmission pulse alternating in operational sign allocated to it, a concentrator is utilized as the network node. This concentrator regenerates the incoming HDLC data packet and then transparently forwards them to their desination.

Claims

1. Method for transmitting binary coded data between a central data station and a plurality of data terminals in a local area network and using a network node connected to a means for input/output signal processing in the central data station, the network node having a first side connected to the means for input/output signal processing and a second side connected to the plurality of data terminals, whereby the data transmission occurs with a standardized data transmission procedure wherein at least the address of at least one data terminal of the plurality of data terminals is contained in the transmitted data and every data terminal only transmits data after being called by the central data station, and whereby the data transmission also occurs with a predetermined data transmission method from a group of base band transmission methods, comprising the steps of using the same data transmission method for the data transmission preceding and following the network node;

regenerating and intermediately storing the data in the network node;

checking the data in the network node with reference to a control code contained in the transmitted data; and

setting a data through-connection path dependent on the destination address contained in the data.

2. The method according to claim 1, wherein the data is transmitted with the data transmission method wherein every status change of the binary coded data has at least one transmission pulse with an alternating operational sign allocated to it.

3. The method according to claim 2, wherein the transmission pulses alternating in operational sign are sin² x-shaped.

4. The method according to claim 1, wherein the data is forward to the data terminal with the destination address only when no error is identified when checking the data.

5. Arrangement for transmitting binary coded data between a central data station and a plurality of data terminals in a local area network utilizing a network node connected to a means for input/output signal processing in the central data section, whereby the data transmission occurs with a standardized data transmission procedure wherein at least the address of at least one data terminal of the plurality of data terminals is contained in the transmitted data and every data terminal only transmits data after being called by the central data station, and whereby the data transmission also occurs with a predetermined data transmission method from a group of base band transmission methods, comprising the network node being switchable and able to use the same data transmission method both in the direction toward the central data station as well as in the direction toward the data terminals;

the network node having a set of first connector units that prevent any occurrence of modulation products in a transmission direction and that shapes pulses and suppresses noise signals in a reception direction, said first connector units respectively connected to connecting lines which are respectively connected to the plurality of data terminals, the network node also having a second connector unit connected to the central data station and to a first data transmission control unit adapted to the data transmission method, the first connector units connected via a controllable selection switch to a second data transmission control unit adapted to the same data transmission method, each of the first and second data transmission control units connected to a common, serial interface control circuit and to a common clock generator; and

the network node also having a microprocessor unit with an integrated buffer memory connected to the first and second data transmission control units as well as to the serial interface control circuit and to the controllable selection switch.

6. The arrangement according to claim 5, wherein a means for switching is provided for setting different operating conditions of the network node, the means for switching connected at least to the first and second data transmission control units, the serial interface control circuit and the controllable selection switch.

7. The arrangement according to claim 6, wherein the means for switching is manually operable.

8. The arrangement according to claim 6, wherein the means for switching is controllable via the microprocessor unit and connected thereto.

9. Arrangement for transmitting binary coded data between a central data station and a plurality of data terminals in a local area network, whereby the data transmission occurs with a standardized data transmission procedure wherein at least the address of at least one data terminal of the plurality of data terminals is contained in the transmitted data and every data terminal only transmits data after being called by the central data station, and whereby the data transmission also occurs with a predetermined data transmission method from the group of base band transmission methods, comprising a switchable network node which uses the same data transmission method both in the direction toward the central data station as well as in the direction toward the data terminals;

the network node having a set of first connector units that prevent any occurrence of modulation products in a transmission direction and that shapes pulses and suppresses noise signals in a reception direction, said first connector units respectively connected to the plurality of data terminals, the network node also having a second connector unit connected to the central data station and to a first data transmission control unit adapted to the data transmission method, the first connector units connected via a controllable selection switch to a second data transmission control unit adapted to the same data transmission method, each of the first and second data transmission control units connected to a common, serial interface control circuit and to a common clock generator; and

the network node also having a microprocessor unit with an integrated buffer memory connected to the first and second data transmission control units as well as to the serial interface control circuit and to the controllable selection switch.

10. The arrangement according to claim 9, wherein a means for switching is provided for setting different operating conditions of the network node, the means for switching connected at least to the first and second data transmission control units, the serial interface control circuit and the controllable selection switch.

11. The arrangement according to claim 10, wherein the means for switching is manually operable.

12. The arrangement according to claim 10, wherein the means for switching is controllable via the microprocessor unit and connected thereto.