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The White Rabbit Fieldbus

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Presentation on theme: "The White Rabbit Fieldbus"— Presentation transcript:

1 The White Rabbit Fieldbus
Fieldbuses WG 26/01/2012 The White Rabbit Fieldbus E.Gousiou (BE/CO/HT) on behalf of the White Rabbit team

2 Outline Introduction to WR & Technology Overview
Implementation & Support Cost Analysis Conclusions

3 Outline Introduction to WR & Technology Overview
Implementation & Support Cost Analysis Conclusions

4 Real Time Systems Real-time communication systems require the execution of operations with tight time constraints Large distances between nodes give long transmission delays Dynamic changes to the number of nodes is not easy

5 Real Time Systems Real-time communication systems require the execution of operations with tight time constraints Large distances between nodes give long transmission delays Dynamic changes to the number of nodes is not easy

6 Real Time Systems Real-time communication systems require the execution of operations with tight time constraints Large distances between nodes give long transmission delays Dynamic changes to the number of nodes is not easy Control Room Trigger at

7 Real Time Systems Real-time communication systems require the execution of operations with tight time constraints Large distances between nodes give long transmission delays Dynamic changes to the number of nodes is not easy Control Room Trigger at

8 Real Time Systems Real-time communication systems require the execution of operations with tight time constraints Large distances between nodes give long transmission delays Dynamic changes to the number of nodes is not easy Control Room Trigger at

9 Real Time Systems Real-time communication systems require the execution of operations with tight time constraints Large distances between nodes give long transmission delays Dynamic changes to the number of nodes is not easy Trigger at Control Room Trigger at Trigger at Trigger at

10 Measures for Aircraft Noise
Real Time Systems Real-time communication systems require the execution of operations with tight time constraints Large distances between nodes give long transmission delays Dynamic changes to the number of nodes is not easy Trigger at 12: Measures for Aircraft Noise Emissions Reduction Trigger at 12: Trigger at 12: From NI presentation at …

11 Measures for Aircraft Noise
Real Time Systems Real-time communication systems require the execution of operations with tight time constraints Large distances between nodes give long transmission delays Dynamic changes to the number of nodes is not easy Measures for Aircraft Noise Emissions Reduction 100 m 100 m From NI presentation at …

12 Real Time Systems 100 m kms 100 m kms
Real-time communication systems require the execution of operations with tight time constraints Large distances between nodes give long transmission delays Dynamic changes to the number of nodes is not easy Measures for Aircraft Noise Emissions Reduction EISCAT: The most sophisticated Imaging Radar ever 100 m 100 m kms kms With White Rabbit a farm of sensors extended over several kms is possible From NI presentation at … From NI presentation at …

13 What is White Rabbit + + White Rabbit is: Ethernet
Determinism & Reliability + Synchronization

14 What is White Rabbit + + White Rabbit is: Ethernet
Determinism & Reliability + Synchronization

15 Ethernet WR switch WR switch WR switch WR switch WR switch WR node WR

16 Ethernet Up to 2000 nodes WR switch WR switch WR switch WR switch

17 Ethernet Up to 2000 nodes Copper or fiber medium
WR switch WR switch Up to 2000 nodes Copper or fiber medium WR switch WR node WR switch WR node WR node WR node Up to 10 Km fiber links WR node WR node WR node WR node WR node WR node WR node WR node WR switch WR node WR node WR node WR node

18 Ethernet Up to 2000 nodes Copper or fiber medium
WR switch WR switch Up to 2000 nodes Copper or fiber medium WR switch WR node WR switch WR node WR node WR node Up to 10 Km fiber links WR node WR node WR node WR node WR node Bandwidth: 1 Gbps WR node WR node WR node WR switch WR node WR node WR node WR node

19 Ethernet Up to 2000 nodes Copper or fiber medium
WR switch WR switch Up to 2000 nodes Copper or fiber medium WR switch WR node WR switch WR node WR node WR node Up to 10 Km fiber links WR node WR node WR node WR node WR node Bandwidth: 1 Gbps WR node WR node WR node WR switch WR switch: 18 ports WR node WR node WR node WR node

20 Ethernet Up to 2000 nodes Copper or fiber medium
WR switch WR node Up to 2000 nodes Copper or fiber medium WR node WR node WR node WR node Up to 10 Km fiber links WR node WR node WR node WR node Bandwidth: 1 Gbps WR node WR node WR node WR switch: 18 ports WR node WR node Add/ Remove nodes dynamically WR node

21 Ethernet Up to 2000 nodes Copper or fiber medium
WR switch WR node Up to 2000 nodes Copper or fiber medium WR node other GbE switch other node WR node WR node WR node Up to 10 Km fiber links WR node WR node WR node WR node Bandwidth: 1 Gbps WR node WR node WR node WR switch: 18 ports WR node Add/ Remove nodes dynamically WR node Non WR devices

22 Ethernet Up to 2000 nodes Copper or fiber medium
WR switch WR node Up to 2000 nodes Copper or fiber medium WR node Other GbE switch other node WR node WR node WR node Up to 10 Km fiber links WR node WR node WR node WR node Bandwidth: 1 Gbps WR node WR node WR node WR switch: 18 ports WR node Add/ Remove nodes dynamically WR node Non WR devices Ethernet Features (VLAN) & Protocols (SNMP)

23 What is White Rabbit + + White Rabbit is: Ethernet
Determinism & Reliability + Synchronization

24 Deterministic & Reliable
Determinism is the guarantee that packet transmission delay between two stations will never exceed a certain boundary. The upper bound delay latency can be verified by analyzing the publicly available source code. Reliability is the ability of a system to provide its services to clients under both routine and abnormal conditions. White Rabbit ensures reliable services by supporting: Topology Redundancy Data Resilience with Forward Error Correction schemes FEC WR switch WR switch WR switch

25 What is White Rabbit + + White Rabbit combines: Ethernet
Determinism & Reliability + Synchronization

26 Synchronization Synchronization: common notion of time in the entire network In White Rabbit sub-nanosecond synchronization is achieved in parallel and transparently to the data exchange Two main technologies are used together: Synchronous Ethernet (SyncE) White Rabbit Precision Time Protocol (enhanced PTP)

27 Synchronization Syntonization with SynchE
Timing Master WR Switch WR switch WR node

28 Synchronization Syntonization with SynchE
Timing Master WR Switch The individual clocks of the nodes/ switches can be slightly different MHz MHZ MHz WR switch WR switch WR node WR node WR node WR node WR node WR node WR node devices have independent free running oscillators, PS receiver and uses its output frequency to encode the outgoing data stream. Slave nodes use PLLs to recover the reference clock from the incoming data. The recovered clock is used to encode the data streams propagated to nodes being lower in the system hierarchy and the data stream sent back to the master node. The root node (WR master) takes its clock from an external source (atomic clock, GPS) and uses it to encode the data streams going to its downlink ports. Each layer of the switches senses this data on its uplink ports and extracts their local clock from that data. The phase of the recovered clock is corrected using the precise link delay obtained by the PTP measurement and DMTD phase detector. The recovered clock is then passed to the downlink ports and recovered by the next layer of switches/nodes which propagate it further, and so on, and so forth. Clock encoded in Ethernet carrier Clock recovered by PHY PLL

29 Synchronization Syntonization with SynchE
Timing Master WR Switch The individual clocks of the nodes/ switches can be slightly different All the network devices have the same frequency! The individual clocks of the nodes/ switches can be slightly different MHz MHZ MHz MHz MHZ MHz WR switch WR switch With SyncE all network devices manage to have the same clock, generated by the System Timing Master WR node WR node WR node WR node WR node The clock is encoded in the Ethernet carrier and recovered by the PLL of the PHY; no extra traffic cost! WR node WR node Common notion of frequency

30 Synchronization Syntonization with SynchE
Timing Master WR Switch All the network devices have the same frequency! WR switch WR switch With SyncE all network devices manage to have the same clock, generated by the System Timing Master WR node WR node WR node WR node WR node The clock is encoded in the Ethernet carrier and recovered by the PLL of the PHY; no extra traffic cost! WR node WR node Common notion of frequency However, there are offsets between the clocks!

31 Synchronization Syntonization with SynchE
Timing Master WR Switch All the network devices have the same frequency! WR switch WR switch With SyncE all network devices manage to have the same clock, generated by the System Timing Master WR node WR node WR node WR node WR node The clock is encoded in the Ethernet carrier and recovered by the PLL of the PHY; no extra traffic cost! WR node WR node Common notion of frequency However, there are offsets between the clocks!

32 Synchronization Offset Adjustment with Enhanced Precision Time Protocol
Timing Master WR Switch WR switch WR switch WR node WR node WR node WR node WR node WR node WR node

33 Synchronization Offset Adjustment with Enhanced Precision Time Protocol
Timing Master WR Switch WR switch

34 Synchronization Offset Adjustment with Enhanced Precision Time Protocol
Timing Master WR Switch Timing Master WR Switch WR switch WR switch t1 17:00 17:00 t2 00:02 t3 00:07 00:07 t4 17:12 17:12

35 Synchronization Offset Adjustment with Enhanced Precision Time Protocol
Timing Master WR Switch System Timing Master WR switch Timing Master WR Switch WR switch t1 17:00 t2 00:02 17:00 clock synchronization requires the knowledge of the link latency. In packet networks, such as Ethernet, the latency can be measured by analyzing the packets’ send and receive timestamps. PTP does not require a separate network infrastructure, allowing for mixing precise time information with data transfers. This approach allows for significant cost reduction (no extra cabling, standard hardware) with no compromises in performance. Hardware-based timestamping t3 00:07 t4 17:12 17:12

36 Synchronization Offset Adjustment with Enhanced Precision Time Protocol
System Timing Master Timing Master WR Switch WR switch WR switch 17:00 t2 00:02 t3 00:07 17:12

37 Synchronization Offset Adjustment with Enhanced Precision Time Protocol
Timing Master WR Switch System Timing Master WR switch WR switch 17:00 t2 00:02 t3 00:07 17:12

38 Synchronization Offset Adjustment with Enhanced Precision Time Protocol
WR node WR switch Timing Master WR Switch Timing Master WR Switch System Timing Master WR switch

39 Synchronization Offset Adjustment with Enhanced Precision Time Protocol
WR node WR switch Timing Master WR Switch Timing Master WR Switch System Timing Master PTP synchronizes the local clocks with the master clock by measuring and compensating the delays introduced by the link. WR switch Common notion of time

40 What is White Rabbit White Rabbit provides: Ethernet Determinism
a large scale monitoring and control network with all nodes synchronized (sub-ns) a scalable and modular platform that reconfigures automatically deterministic & robust delivery messages Determinism Synchronization WR switch NI PXI crate management database actuator sensor monitoring

41 What is White Rabbit White Rabbit provides: Ethernet Determinism
a large scale monitoring and control network with all nodes synchronized (sub-ns) a scalable and modular platform that reconfigures automatically deterministic & robust delivery messages Determinism Synchronization WR switch PXI crate management database actuator sensor monitoring

42 Outline Introduction to WR & Technology Overview
Implementation & Support Cost Analysis Conclusions

43 Implementation & Support
White Rabbit technology will be made of commercially available off-the-shelf network gear; the components of a WR network will be offered through the catalogues of companies CO will provide a local knowledge hub for CERN users with reference designs, documentation, linux SW; technical support will also be provided by the companies A White Rabbit network is composed of WR Switches WR switch WR Nodes WR node IP core WR Timing Master Timing Master WR Switch Copper/ Fiber links

44 Implementation & Support
White Rabbit technology will be made of commercially available off-the-shelf network gear; the components of a WR network will be offered through the catalogues of companies CO will provide a local knowledge hub for CERN users with reference designs, documentation, linux SW; technical support will also be provided by the companies A White Rabbit network is composed of WR Switches WR switch WR Nodes WR node IP core WR Timing Master Timing Master WR Switch Copper/ Fiber links

45 Implementation & Support
White Rabbit technology will be made of commercially available off-the-shelf network gear; the components of a WR network will be offered through the catalogues of companies CO will provide a local knowledge hub for CERN users with reference designs, documentation, linux SW; technical support will also be provided by the companies A White Rabbit network is composed of WR Switches WR switch WR Nodes WR node SPEC IP core … ADC DAC TDC WR Timing Master Timing Master WR Switch WR node WR switch Copper/ Fiber links same optical link used for transmission/ reception

46 An example application
SPEC

47 An example application
SPEC Xilinx Spartan 6 ADC user core time data WR PTP core SFP

48 An example application
SPEC Xilinx Spartan 6 ADC user core time data WR PTP core SFP

49 An example application
SPEC Xilinx Spartan 6 ADC user core time WHISBONE EtherBone ETHERNET WR PTP core SFP

50 An example application
SPEC Xilinx Spartan 6 ADC WR PTP core user SFP time WHISBONE EtherBone ETHERNET SPEC ADC

51 An example application
SPEC Data Master WR switch … WR switch … SPEC DAC TDC SPEC ADC

52 Outline Introduction to WR & Technology Overview
Implementation & Support Cost Analysis Conclusions

53 Components Costs 3K CHF 0 CHF 1K CHF < 1 CHF/ m SPEC
White Rabbit network components costs WR Switch WR switch 3K CHF WR Node WR node 0 CHF SPEC board 1K CHF SPEC Fiber links < 1 CHF/ m

54 White Rabbit VS standard PTP
Technologies Used Accuracy # 1Gb SFP Ports Price (CHF) SyncE PTP HW timestamps CISCO Nexus NO YES NO sub ms K Hirschmann MACH NO YES YES ns K7 Ruggedcom RSG NO YES YES us K White Rabbit YES YES YES sub ns K Media Markt NO NO NO ? K

55 Maintenance Costs Network Configuration & Management through standard Ethernet protocols (SNMP, MIB) Use of well-established tools (Wireshark with WR pluggin) Any unexpected behavior can be diagnosed by verifying the source code or simulating the use case; if necessary modifications can be implemented

56 Outline Introduction to WR & Technology Overview
Implementation & Support Cost Analysis Conclusions

57 “Oh dear! Oh dear! I shall not be too late!”
Deterministic and Reliable Ethernet Offering transparently sub-ns synchronization Easy to use; well established standards Support by companies and internally at CERN Guaranteed and risk free solution with publicly available source code

58 Extras

59 Backup WR Timing Master
White Rabbit network Ref Clock WR Timing Master Backup WR Timing Master other GbE WR switch WR switch WR switch switch other node management WR node controller WR switch WR switch other node management other node monitoring other node database WR node sensor WR node actuator WR node sensor data & timing routes data routes

60 White Rabbit network Ref. Clock WR timing master WR switch WR switch
Backup WR timing master WR switch WR switch WR switch WR switch WR switch WR node WR node WR node data and timing routes

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