ONU delay and jitter measurment

• US 20070133424A1
• Filed: 12/12/2006
• Published: 06/14/2007
• Est. Priority Date: 12/13/2005
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Network Communications Incorporated (Fujitsu Limited)
• Inventors: Vladescu, Virgil, Brolin, Stephen
• Granted Patent: US 8,289,858 B2
• Time in Patent Office: Days
• US Class Current: 370/249
• CPC Class Codes: H04J 2203/0094 Virtual Concatenation
• CPC Class Codes: H04J 3/1694 Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers Passive Optical Networks H04Q11/0062
• CPC Class Codes: H04L 12/18 for broadcast or conference , e.g. multicast
• CPC Class Codes: H04L 41/0213 Standardised network management protocols, e.g. simple network management protocol [SNMP]
• CPC Class Codes: H04L 41/024 using relational databases for representation of network management data, e.g. managing via structured query language [SQL]
• CPC Class Codes: H04L 41/042 comprising distributed management centres cooperatively managing the network
• CPC Class Codes: H04L 41/0806 for initial configuration or provisioning, e.g. plug-and-play
• CPC Class Codes: H04L 41/0856 by backing up or archiving configuration information
• CPC Class Codes: H04L 41/5054 Automatic deployment of services triggered by the service manager, e.g. service implementation by automatic configuration of network components
• CPC Class Codes: H04L 41/509 wherein the managed service relates to media content delivery, e.g. audio, video or TV
• CPC Class Codes: H04L 43/50 Testing arrangements
• CPC Class Codes: H04L 45/16 Multipoint routing
• CPC Class Codes: H04L 49/15 Interconnection of switching modules
• CPC Class Codes: H04L 49/1523 Parallel switch fabric planes
• CPC Class Codes: H04L 49/30 Peripheral units, e.g. input or output ports
• CPC Class Codes: H04L 49/351 for local area network [LAN], e.g. Ethernet switches
• CPC Class Codes: H04L 49/352 Gigabit ethernet switching [GBPS]
• CPC Class Codes: H04L 49/357 Fibre channel switches
• CPC Class Codes: H04L 49/50 Overload detection or protection within a single switching element
• CPC Class Codes: H04Q 11/0062 Network aspects
• CPC Class Codes: H04Q 11/0067 : Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
• CPC Class Codes: H04Q 11/0071 : Provisions for the electrical-optical layer interface
• CPC Class Codes: H04Q 2011/0079 : Operation or maintenance aspects
• CPC Class Codes: H04Q 2011/0083 : Testing; Monitoring
• CPC Class Codes: H04Q 2011/0084 : Quality of service aspects
• CPC Class Codes: H05K 7/20009 : using a gaseous coolant in electronic enclosures in cabinets of standardized dimensions H05K7/20536; in server cabinets H05K7/20709; in vehicle electronic casings H05K7/20845; in power control electronics H05K7/2089; in displays H05K7/20954
• CPC Class Codes: H05K 7/202 : Air circulating in closed loop within enclosure wherein heat is removed through heat-exchangers
• CPC Class Codes: Y04S 40/00 : Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them

Abstract

A system and method provide measurement of round trip delay and jitter in an optical network without adding cost to the components of the network. A method of determining round-trip delay and jitter in an optical network comprises the steps of a) transmitting a test frame over the optical network to a device on the optical network, b) receiving a looped-back test frame from the device over the optical network, and c) determining a round-trip delay measurement using the received looped-back test frame.

Claims

1. A method of determining round-trip delay and jitter in an optical network, comprising the steps of:

a) transmitting a test frame over the optical network to a device on the optical network;

b) receiving a looped-back test frame from the device over the optical network; and

c) determining a round-trip delay measurement using the received looped-back test frame.

2. The method of claim 1, wherein the test frame comprises a time stamp.

3. The method of claim 2, wherein the determining step comprises the step of:

determining the round-trip delay measurement based on a difference between a time of receipt of the received looped-back test frame and the time stamp in the received looped-back test frame.

4. The method of claim 3, further comprising the steps of:

performing a plurality of iterations of steps a)-c) to determine a plurality of round-trip delay measurements;

determining a maximum round-trip delay measurement of the plurality of determined round-trip delay measurements;

determining a minimum round-trip delay measurement of the plurality of determined round-trip delay measurements; and

determining a jitter measurement based on a difference between the maximum round-trip delay measurement and the minimum round-trip delay measurement.

5. The method of claim 4, wherein the method is performed in an Optical Line Termination.

6. The method of claim 5, wherein the device is an Optical Line Unit.

7. The method of claim 6, wherein the test frame is identified by a GPON Encapsulation Method tag.

8. The method of claim 1, wherein the method is performed in an Optical Line Termination.

9. The method of claim 8, wherein the device is an Optical Line Unit.

10. The method of claim 9, wherein the test frame is identified by a GPON Encapsulation Method tag.

11. Apparatus for determining round-trip delay and jitter in an optical network, comprising:

a) circuitry operable to transmit a test frame over the optical network to a device on the optical network;

b) circuitry operable to receive a looped-back test frame from the device over the optical network; and

c) circuitry operable to determine a round-trip delay measurement using the received looped-back test frame.

12. The apparatus of claim 11, wherein the test frame comprises a time stamp.

13. The apparatus of claim 12, wherein the circuitry operable to determine a round-trip delay measurement using the received looped-back test frame comprises circuitry operable to determine the round-trip delay measurement based on a difference between a time of receipt of the received looped-back test frame and the time stamp in the received looped-back test frame.

14. The apparatus of claim 13, further comprising:

circuitry operable to repeatedly operate circuitry a)-c) to determine a plurality of round-trip delay measurements;

circuitry operable to determine a maximum round-trip delay measurement of the plurality of determined round-trip delay measurements;

circuitry operable to determine a minimum round-trip delay measurement of the plurality of determined round-trip delay measurements; and

circuitry operable to determine a jitter measurement based on a difference between the maximum round-trip delay measurement and the minimum round-trip delay measurement.

15. The apparatus of claim 14, wherein the apparatus is included in an Optical Line Termination.

16. The apparatus of claim 15, wherein the device is an Optical Line Unit.

17. The apparatus of claim 16, wherein the test frame is identified by a GPON Encapsulation Apparatus tag.

18. The apparatus of claim 11, wherein the apparatus is included in an Optical Line Termination.

19. The apparatus of claim 18, wherein the device is an Optical Line Unit.

20. The apparatus of claim 19, wherein the test frame is identified by a GPON Encapsulation Apparatus tag.

21. An Optical Network Unit operable with an Optical Line Termination to determine round-trip delay and jitter in an optical network, comprising:

a) circuitry operable to receive and recognize a test frame over the optical network from the Optical Line Termination; and

b) circuitry operable to loop-back the test frame to the Optical Line Termination for determination of the round-trip delay measurement.

22. The Unit of claim 21, wherein the test frame comprises a time stamp.

23. The Unit of claim 22, wherein the Optical Line Termination is operable to determine a round-trip delay measurement using the received looped-back test frame comprises circuitry operable to determine the round-trip delay measurement based on a difference between a time of receipt of the received looped-back test frame and the time stamp in the received looped-back test frame.

24. The Unit of claim 23, wherein the Optical Line Termination is operable to determine a jitter measurement based on a difference between a maximum round-trip delay measurement and a minimum round-trip delay measurement determined from a plurality of round-trip delay measurements.

25. The Unit of claim 24, wherein the test frame is identified by a GPON Encapsulation Method tag.