Signal distribution system switching module

• US 4,719,459 A
• Filed: 03/06/1986
• Issued: 01/12/1988
• Est. Priority Date: 03/06/1986
• Status: Expired due to Fees

• Current Assignee: Grumman Aerospace Corporation (Northrop Grumman Corporation)
• Original Assignee: Grumman Aerospace Corporation (Northrop Grumman Corporation)
• Inventors: Eivers, Donald J., Kovacs, Eddie T.
• Primary Examiner(s): YUSKO, DONALD
• Application Number:
  US06/836,929
• Time in Patent Office: 677 Days
• Field of Search: 340/825.79, 340/825.8, 371/11, 371/15, 371/20, 364/579, 364/580, 324/73 R
• US Class Current: 340/2.27
• CPC Class Codes: G01R 31/2834 Automated test systems [ATE]; using microprocessors or computers G01R31/317 takes precedence; ATE for detection of defective computer hardware G06F11/2736
• CPC Class Codes: G01R 31/31926 Routing signals to or from the device under test [DUT], e.g. switch matrix, pin multiplexing

Abstract

The signal distribution function in a signal distribution system is performed in a switching matrix under the control of a hybrid controller. With respect to the switching matrix, there are approximately 120-140 available interface I/O connections such that an equipment under test can be selectively connected to any one of a plurality of test instruments. The relays within the switching matrix are selectively activated such that a signal path connecting the equipment under test to a particular test instrument can be accomplished with a minimum amount of switching path conflicts.

Claims

1. In a signal distribution system having multiple switching matrix means for effecting connection between an equipment under test and at least one of a plurality of instruments, an interfacing means for connecting the equipment under test to a switching matrix means, each of the switching matrix means including a plurality of relays adapted to be selectively controlled by at least one controller means, each switching matrix means comprising:

a plurality of I/O ports connected to the interfacing means, at least one of the I/O ports communicating with the equipment under test;

a corresponding number of first data lines each connectable directly to one of the I/O ports for providing digital signals from the equipment under test to at least one digital test instrument for measurement, at least one of the first data lines being connected to a switch means adaptable to connect that data line to a first analog instrument so that analog parameters of the digital signals transmitted on that data line are measured by the first analog instrument;

an instrument-to-bus matrix means for effecting communication between the switching matrix means and an intercard signal bus, the instrument-to-bus matrix means including a plurality of second data lines each having a relay means;

multiple matrix buses, corresponding in number to the I/O ports, each connectable to a particular I/O port for selectively providing a signal path between that I/O port and one of the second data lines of the instrument-to-bus matrix means, the one second data line connectable to at least an instrument means.

2. The switching matrix means according to claim 1, wherein each I/O port further comprises a two-way switching means for connecting the I/O port to either the corresponding first data line or the corresponding matrix bus.

3. The switching matrix means according to claim 1, wherein each matrix bus includes a plurality of relay means.

4. The switching matrix means according to claim 3, wherein the number of relay means of the instrument-to-bus matrix means is greater than the number of relay means of the matrix bus.

5. The switching matrix means according to claim 4, wherein each matrix bus of the multiple matrix buses has only one relay means operative at any one time.

6. The switching matrix means according to claim 1, wherein the at least one controller means is connected to a central processing unit for receiving instructions therefrom;

and

wherein the relay means and the switching means are controllably activated by the at least one controller means.

7. The switching matrix means according to claim 1, wherein the instrument means is a second analog instrument and wherein the signal path provides analog signals from the equipment under test to the second analog instrument for measurement.

8. The switching matrix means according to claim 1, wherein the instrument means is a stimulus instrument and wherein the signal path transmits stimulus signals sent from the instrument means to stimulate the equipment under test so as to elicit a response therefrom.

9. In a signal distribution system having multiple switching matrix means for selectively connecting an equipment under test to at least one of a plurality of instruments, each switching matrix means being controlled by at least one controller means, the switching matrix means comprising:

a plurality of I/O ports, at least one of the I/O ports being connected to the equipment under test;

corresponding first switching means connected in a one-to-one relationship to the plurality of I/O ports;

corresponding first data lines, each of the first data lines being connectable via a corresponding first switching means to a corresponding I/O port for providing digital signals from the equipment under test to a digital test instrument for measurement;

multiple matrix buses, corresponding in number to the I/O ports, each connectable via a corresponding first switching means to a particular I/O port for selectively providing a signal path between that I/O port and one of a plurality of second data lines, each of the matrix buses including a plurality of relay means;

wherein at least one of the first data lines is connected to a second switch means connectable to an analog instrument for measuring the analog parameters of the digital signals on that one first data line; and

wherein at least one of the second data lines is connectable to an instrument means.

10. The switching matrix means according to claim 9, wherein each matrix bus includes a plurality of relay means.

11. The switching matrix means according to claim 10, wherein each matrix bus of the multiple matrix buses has only one relay means operative at any one time.

12. The switching matrix means according to claim 11, wherein the at least one controller means is connected to a central processing unit for receiving instructions therefrom;

and

wherein the relay means and the switching means are controllably activated by the at least one controller means.

13. The switching matrix according to claim 9, wherein if the instrument means is a test instrument, signals from the equipment under test are sent via the signal path to the test instrument;

and

wherein, if the instrument means is a stimulus instrument, stimulating signals are sent from the stimulus instrument to the equipment under test for eliciting a response therefrom.