Firewall performance monitoring and limited access system

• US 6,519,723 B1
• Filed: 09/27/1996
• Issued: 02/11/2003
• Est. Priority Date: 09/27/1996
• Status: Expired due to Term

• Current Assignee: Viavi Solutions, Inc. (Lumentum Holdings Inc.)
• Original Assignee: Applied Digital Access, Inc. (Lumentum Holdings Inc.)
• Inventors: Nelson, Derek J., Milliman, Mark, Allred, Lorin D.
• Primary Examiner(s): Iqbal, Nadeem
• Application Number:
  US08/721,184
• Time in Patent Office: 2,328 Days
• Field of Search: 371/20.1, 371/27.5, 395/285-289, 395/490, 395/491, 395/183.15, 395/183.19, 370/241, 370/242, 370/252, 379/100, 379/93, 379/34, 379/60, 714/712, 714/715, 714/18, 714/25, 714/43, 714/47, 714/39
• US Class Current: 714/712
• CPC Class Codes: H04L 43/045 for graphical visualisation of monitoring data
• CPC Class Codes: H04L 43/06 Generation of reports
• CPC Class Codes: H04L 43/0829 Packet loss
• CPC Class Codes: H04L 43/0847 Transmission error
• CPC Class Codes: H04L 43/0894 Packet rate
• CPC Class Codes: H04L 43/18 Protocol analysers
• CPC Class Codes: H04L 43/50 Testing arrangements
• CPC Class Codes: H04L 63/0281 Proxies
• CPC Class Codes: H04L 63/1408 by monitoring network traffic monitoring network traffic per se H04L43/00

Abstract

A protocol analysis access system (“PAAS”) and a restricted access method for remotely monitoring and testing embedded channels in a signal communicated over a telecommunications network. The PAAS system is capable of accessing a signal from a network circuit through digital cross-connect systems (“DCSs”) or through direct connections. In case of restricted network access, the PAAS performs non-intrusive monitor-only function on the signal without interfering with or interrupting the data flow over the network circuit. In addition, the PAAS system is capable of performing non-intrusive conformance testing on a signal using a protocol analyzer. In case of non-restricted network access, the PAAS system allows full performance testing on a signal. The PAAS system functions are executed by an external command source from a remote network maintenance center via remote control links. The monitor-only and test results are reported back to the remote network maintenance center for further analysis.

Claims

1. In a telecommunications network, a signal access system comprising:

an analyzer configured to perform testing on a service layer of a signal;

an interface device connected to the analyzer, the interface device configured to perform at least one testing mode, including a monitor-only mode, on the signal; and

an external command source providing commands to the interface device, the external command source configured to request a testing mode on the signal, wherein the interface device determines the testing mode to be performed on the signal based on the commands and preselected criteria.

2. The system defined in claim 1, wherein the interface device is a test system controller/remote test unit (“

TSC/RTU”

) providing access to a channel embedded in the signal through one of a plurality of digital cross-connect system (“

DCS”

).

3. The system defined in claim 2, wherein the TSC/RTU comprises an administration shelf, a test resource shelf, and applications software.

4. The system defined in claim 2, wherein the TSC/RTU is capable of communicating with a plurality of DCS systems.

5. The system defined in claim 4, wherein the TSC/RTU communicates with the DCS via an X.25 control link.

6. The system defined in claim 4, wherein the TSC/RTU communicates with the DCS via an asynchronous RS-232 control link.

7. The system defined in claim 4, wherein the TSC/RTU communicates with the DCS via a Facility Access Digroup (FAD) port for accessing wideband signals.

8. The system defined in claim 4, wherein the TSC/RTU communicates with the DCS via a Test Access Digroup (TAD) port for accessing narrowband signals.

9. The system defined in claim 2, wherein the TSC/RTU performs non-intrusive monitoring on a DS1 signal and transmits test results to a network maintenance center.

10. The system defined in claim 2, wherein the TSC/RTU performs non-intrusive monitoring on a DS0 signal and transmits test results to a network maintenance center.

11. The system defined in claim 2, wherein the TSC/RTU performs non-intrusive monitoring on DS0 embedded channels and transmits test results to a network maintenance center.

12. The system defined in claim 1, wherein the interface device is an integrated test access unit (“

ITAU”

) capable of providing test access through directly connected circuits.

13. The system defined in claim 12, wherein the ITAU comprises an administration shelf, a high-speed interface shelf, and applications software.

14. The system defined in claim 12, wherein the ITAU performs non-intrusive monitoring on a plurality of channels through directly connected circuits.

15. The system defined in claim 12, wherein the ITAU performs non-intrusive monitoring on a DS1 signal and transmits test results to a network maintenance center.

16. The system defined in claim 12, wherein the ITAU performs non-intrusive monitoring on a DS0 signal and transmits test results to a network maintenance center.

17. The system defined in claim 12, wherein the ITAU performs non-intrusive monitoring on DS0 embedded channels and transmits test results to a network maintenance center.

18. The system defined in claim 1, wherein the external command source transmits TL1 commands to the interface device via an X.25 control link.

19. The system defined in claim 1, wherein the external command source transmits TL1 commands to the interface device via an Ethernet control link.

20. The system defined in claim 1, wherein the interface device routes the signal to the analyzer to perform conformance testing.

21. The system defined in claim 1, wherein the analyzer is a T1 based protocol analyzer set.

22. The system defined in claim 1, wherein the interface device is connected to the analyzer via a FAD port for wideband signal testing.

23. The system defined in claim 1, wherein the interface device is connected to the analyzer via a FAD port for narrowband signal testing.

24. The system defined in claim 1, wherein the interface device is connected to the analyzer via a TAD port for narrowband signal testing.

25. The system defined in claim 1, wherein the external command source is capable of transmitting control commands to the analyzer via an X.25 control link.

26. The system defined in claim 1, wherein the external command source is capable of transmitting control commands to the analyzer via an Ethernet control link.

27. In a telecommunications network, a signal access system capable of restricting access to a signal of a selected circuit comprising:

an analyzer configured to perform testing on a service layer of the signal;

an interface device connected to the analyzer, the interface device configured to restrict access to the signal; and

an external command source providing commands to the interface device, the external command source configured to provide a monitor-only request, wherein the interface device determines a testing mode to be performed based on the commands and preselected criteria.

28. The system defined in claim 27, wherein the interface device is a test system controller/remote test unit (“

TSC/RTU”

) providing access to a channel embedded in the signal through one of a plurality of digital cross-connect system (“

DCS”

).

29. The system defined in claim 28, wherein the TSC/RTU comprises an administration shelf, a test resource shelf, and applications software.

30. The system defined in claim 28, wherein the TSC/RTU is capable of communicating with a plurality of DCS systems.

31. The system defined in claim 28, wherein the TSC/RTU communicates with the DCS via an X.25 control link.

32. The system defined in claim 28, wherein the TSC/RTU communicates with the DCS via a Facility Access Digroup (FAD) port for accessing wideband signals.

33. The system defined in claim 28, wherein the TSC/RTU communicates with the DCS via a Test Access Digroup (TAD) port for accessing narrowband signals.

34. The system defined in claim 28, wherein the TSC/RTU performs non-intrusive monitoring on a DS1 signal and transmits test results to a network maintenance center.

35. The system defined in claim 28, wherein the TSC/RTU performs non-intrusive monitoring on a DS0 signal and transmits test results to a network maintenance center.

36. The system defined in claim 28, wherein the TSC/RTU performs non-intrusive monitoring on DS0 embedded channels and transmits test results to a network maintenance center.

37. The system defined in claim 27, wherein the interface device is an integrated test access unit (“

ITAU”

) capable of providing test access through directly connected circuits.

38. The system defined in claim 37, wherein the ITAU comprises an administration shelf, a high-speed interface shelf, and applications software.

39. The system defined in claim 37, wherein the ITAU is performs non-intrusive monitoring on a plurality of channels through directly connected circuits.

40. The system defined in claim 37, wherein the ITAU performs non-intrusive monitoring on a DS1 signal and transmits test results to a network maintenance center.

41. The system defined in claim 37, wherein the ITAU performs non-intrusive monitoring on a DS0 signal and transmits test results to a network maintenance center.

42. The system defined in claim 37, wherein the ITAU performs non-intrusive monitoring on DS0 embedded channels and transmits test results to a network maintenance center.

43. The system defined in claim 27, wherein the external command source transmits TL1 commands to the interface device via an X.25 control link.

44. The system defined in claim 27, wherein the external command source transmits TL1 commands to the interface device via an Ethernet control link.

45. The system defined in claim 27, wherein the interface device routes the signal to the analyzer to perform conformance testing.

46. The system defined in claim 27, wherein the analyzer is a T1 based protocol analyzer set.

47. The system defined in claim 27, wherein the interface device is connected to the analyzer via a FAD port for wideband signal testing.

48. The system defined in claim 27, wherein the interface device is connected to the analyzer via a FAD port for narrowband signal testing.

49. The system defined in claim 27, wherein the interface device is connected to the analyzer via a TAD port for narrowband signal testing.

50. The system defined in claim 27, wherein the external command source is capable of transmitting control commands to the analyzer via an X.25 control link.

51. The system defined in claim 27, wherein the external command source is capable of transmitting control commands to the analyzer via an Ethernet control link.

52. The system defined in claim 27, wherein the interface device is capable of performing intrusive test access on the signal of a non-restricted network circuits.

53. The system defined in claim 27, wherein the interface device determines the restriction of access to the signal of the selected circuit.

54. The system defined in claim 27, wherein a digital cross-connect system (“

DCS”

) determines the restriction of access to the signal of the selected circuit.

55. The system defined in claim 27, wherein the restriction of access to the signal of a selected network circuit is determined by a user-identification/privilege code.

56. The system defined in claim 27, wherein the activity status of the selected circuit determines the restriction of access to the signal of the selected circuit.

57. The system defined in claim 27, wherein a digital cross-connect (“

DCS”

) and the interface device jointly determine the restriction to access the signal of the selected circuit.

58. The system defined in claim 27, wherein a digital cross-connect (“

DCS”

), the activity status of the selected circuit, and the interface device jointly determine the restriction to access the signal of the selected circuit.

59. The system as defined in claim 27, wherein the interface device allows a monitor-only mode on the signal of the selected circuit determined as having a restricted status.

60. The system as defined in claim 27, wherein the interface device allows a full test access mode on the signal of the selected circuit determined as having a non-restricted status.

61. A method of testing a circuit, the method comprising:

selecting the circuit via an interface device;

testing the selected circuit using an analyzer; and

restricting the testing of the selected circuit to a non-intrusive, monitor-only mode based on preselected criteria.

62. In a telecommunications network, a signal access system, comprising:

means for analyzing a signal to perform testing on a service layer of the signal;

means, connected to the analyzing means, for interfacing with the network configured to perform at least one testing mode, including a monitor-only mode, on the signal; and

means for commanding the interfacing means, the commanding means configured to request a testing mode on the signal, wherein the interfacing means determines the testing mode to be performed on the signal based on the commands and preselected criteria.

63. In a telecommunications network, a signal access system, capable of restricting access to a signal of a selected circuit, comprising:

means for analyzing the signal to perform testing on a service layer of the signal;

means, connected to the analyzing means, for interfacing with the circuit, the interfacing means configured to restrict access to the signal; and

means for commanding the interfacing means, the commanding means configured to provide a monitor-only request, wherein the interfacing means determines a testing mode to be performed based on the commands and preselected criteria.