Methods and devices for testing and monitoring high speed communication networks

• US 7,564,798 B2
• Filed: 08/25/2004
• Issued: 07/21/2009
• Est. Priority Date: 08/27/2003
• Status: Active Grant

• Current Assignee: Viavi Solutions, Inc. (Lumentum Holdings Inc.)
• Original Assignee: Finisar Corporation (II-VI Incorporated)
• Inventors: Haber, Sara
• Primary Examiner(s): Moe; Aung S
• Assistant Examiner(s): Rose; Kerri M
• Application Number:
  US10/926,422
• Publication Number:
  US 20050086336A1
• Time in Patent Office: 1,791 Days
• Field of Search: 370/216, 370/229, 370241-253, 714/100, 714/1, 714/2, 714/25, 714/27, 714/28, 714/57, 710 15- 19, 702/108, 702/117, 702/118, 702/121
• US Class Current: 370/252
• CPC Class Codes: H04L 1/243 at the transmitter, using a loop-back
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks
• CPC Class Codes: H04L 43/0847 Transmission error
• CPC Class Codes: H04L 43/106 using time related information in packets, e.g. by adding timestamps
• CPC Class Codes: H04L 43/50 Testing arrangements

Abstract

Devices and methods are disclosed for use in testing and evaluating aspects of a high speed communications network. In particular, a portable traffic checker for field use is provided that includes multiple sets of different types of communication links and is compatible with multiple protocols. One such traffic checker includes “test” and “monitor” modules having access to a data signal received by the traffic checker. The “test” module tests aspects of the communications network with a BER methodology, while the “monitor” module checks and reports on aspects of the data signal such as frame sizes, data rates, and data signal errors. Information obtained by the modules can be timestamped and stored in a log, and may also be uploaded through a communications port. Some information may also be displayed. Additionally, the traffic checker is switchable between the “test” and “monitor” modes and enables a user to select a data rate.

Claims

1. A traffic checker suitable for use in testing and evaluating aspects of a high speed communications network, the traffic checker comprising:

a plurality of link connections;

a display; and

a plurality of components configured for communication with the plurality of link connections, the plurality of components being compatible with multiple protocols and comprising;

a monitor module, comprising;

a retimer configured to receive and retime a data signal by way of at least one of the link connections;

at least one monitor submodule with access to the both the data signal and the retimed data signal and configured to communicate with the display;

a timestamp submodule; and

a first log in communication with the at least one monitor submodule and the timestamp submodule, wherein errors identified in at least one of the retimed data signal or the data signal are filed in the first log and timestamped with the timestamp submodule; and

a test module in communication with the display and comprising;

a transmitter in communication with one of the link connections;

a compare engine;

a pattern memory in communication with the transmitter and the compare engine, wherein the transmitter transmits a particular test pattern from the pattern memory and wherein the compare engine determines an effect of the communications network on the test pattern;

a second log;

an error calculator in communication with the compare engine and with the second log; and

a timestamp module in communication with the second log.

2. The traffic checker as recited in claim 1, wherein the at least one monitor submodule comprises one or more of:

a frame size submodule;

an error check submodule; and

, a data rate submodule.

3. The traffic checker as recited in claim 1, wherein the plurality of link connections comprises at least two pairs of link connections, at least one of the pairs of link connections conforming to a different standard than another of the pairs of link connections.

4. The traffic checker as recited in claim 3, wherein at least one of the pairs comprises one of:

GBIC connections;

SFFP connections; and

, ESCON connections.

5. The traffic checker as recited in claim 1, wherein the at least one monitor submodule is configured to operate in connection with at least the retimed data signal.

6. The traffic checker as recited in claim 1, wherein the at least one monitor submodule comprises:

a pair of frame size modules;

a pair of error check modules; and

a pair of data rate modules.

7. The traffic checker as recited in claim 1, wherein the at least one monitor submodule is configured to provide information concerning at least one of:

frames of the data signal;

words of the data signal;

synchronization of the data signal relative to a reference clock;

connection link status; and

, status of the data signal.

8. The traffic checker as recited in claim 1, wherein the first log and the second log comprise the same log.

9. The traffic checker as recited in claim 1, wherein the multiple protocols with which the monitor module and test module are compatible include at least two of the following protocols:

Gigabit Ethernet;

10 Gigabit Ethernet;

Fibre Channel;

Fiber Connector;

Inter System Coupling Interface;

Synchronous Optical Network;

OC48; and

Enterprise Systems Connection.

10. The traffic checker as recited in claim 1, wherein the first log is configured to store information obtained by the at least one monitor module and timestamped by the timestamp module.

11. The traffic checker as recited in claim 1, wherein the monitor module further comprises at least one of the following components configured to receive at least a portion of the data signal:

a multiplexer;

a demultiplexer;

a serializer; and

, a deserializer.

12. The traffic checker as recited in claim 1, wherein the error calculator comprises a BER calculator configured to calculate a bit error rate associated with a test pattern.

13. The traffic checker as recited in claim 1, wherein the compare engine comprises a ‘

compare’

RAM.

14. The traffic checker as recited in claim 1, wherein the traffic checker is configured for use in both head-to-head setups and loop setups.

15. The traffic checker as recited in claim 1, further comprising a latency calculator configured to transmit and receive frames by way of at least one of the link connections.

16. The traffic checker as recited in claim 15, wherein the latency module is configured to communicate with at least one of the first and second logs.

17. The traffic checker as recited in claim 1, further comprising a data rate selector switch that permits user initiated selection of a data rate associated with processes performed by the traffic checker.

18. The traffic checker as recited in claim 1, further comprising a mode selector switch that permits user initiated selection of either a “

monitor”

mode or a “

test”

mode.

19. The traffic checker as recited in claim 1, further comprising an input selector switch that permits user initiated selection of a particular set of link connections to be used for communications.

20. A traffic checker suitable for use in testing and evaluating aspects of a high speed communications network, the traffic checker comprising:

a plurality of link connections;

a display; and

a plurality of components configured for communication with the plurality of link connections, the plurality of components being compatible with multiple protocols and comprising;

a monitor module, configured to perform real time testing of the network on data signals that include both untimed and retimed data signals, comprising;

a retimer configured to receive and transmit data signals by way of the link connections;

a plurality of monitor submodules with access to the data signal and configured to communicate with the display, the plurality of monitor submodules comprising;

a pair of frame size submodules;

a pair of error check submodules; and

a pair of data rate submodules; and

a first timestamp submodule; and

a first log in communication with the error check submodules and the first timestamp submodule, the first log including errors identified by the error check submodules; and

a test module in communication with the display and comprising;

a transmitter in communication with one of the link connections;

a compare engine;

a pattern memory in communication with the transmitter and the compare engine, wherein the transmitter transmits a particular test pattern from the pattern memory and wherein the compare engine determines an effect of the communications network on the test pattern;

a second log;

a BER calculator in communication with the compare engine and with the second log; and

a second timestamp module in communication with the second log.

21. The traffic checker as recited in claim 20, wherein the traffic checker comprises a portable device suitable for field use.

22. The traffic checker as recited in claim 20, wherein the plurality of link connections comprises:

a pair of GBIC link connections; and

a pair of SFFP link connections.

23. The traffic checker as recited in claim 20, wherein at least one of the monitor submodules is configured to operate in connection with a retimed data signal.

24. The traffic checker as recited in claim 20, wherein the monitor module is configured to obtain information concerning at least one of:

frames of a data signal;

words of a data signal;

synchronization of a data signal relative to a reference clock;

connection link status; and

, status of a data signal.

25. The traffic checker as recited in claim 20, wherein the multiple protocols with which the monitor module and test module are compatible include at least two of the following protocols:

Gigabit Ethernet;

10 Gigabit Ethernet;

Fibre Channel;

Fiber Connector;

Inter System Coupling Interface;

Synchronous Optical Network;

OC48; and

Enterprise Systems Connection.

26. The traffic checker as recited in claim 20, wherein the first log is configured to store information obtained by the error check submodules and timestamped by the first timestamp module.

27. The traffic checker as recited in claim 20, wherein the monitor module further comprises at least one of the following components configured to receive at least a portion of a data signal:

a multiplexer;

a demultiplexer;

a serializer; and

, a deserializer.

28. The traffic checker as recited in claim 20, wherein the compare engine comprises a ‘

compare’

RAM.

29. The traffic checker as recited in claim 20, wherein the traffic checker is configured for use in both head-to-head setups and loop setups.

30. The traffic checker as recited in claim 20, further comprising a latency calculator configured to transmit and receive frames by way of at least one of the link connections.

31. The traffic checker as recited in claim 30, wherein the latency module is configured to communicate with at least one of the first and second logs.

32. The traffic checker as recited in claim 20, further comprising a data rate selector switch that permits user initiated selection of a data rate associated with processes performed by the traffic checker.

33. The traffic checker as recited in claim 20, further comprising a mode selector switch that permits user initiated selection of either a “

monitor”

mode or a “

test”

mode.

34. The traffic checker as recited in claim 20, further comprising an input selector switch that permits user initiated selection of a particular set of link connections to be used for communications.