Zwischenpräsentation. Reliable high-speed data transfers on satellites across Wizard-Link. Author: Max Kraft-Kugler 19/11/ DOC-TAS-EN-003
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1 Zwischenpräsentation Reliable high-speed data transfers on satellites across Wizard-Link DOC-TAS-EN /11/15 Author: Max Kraft-Kugler
2 Contents 2 Motivation Radiation Effects Error Control Existing High Speed Links WizardLink Further radiation analysis Next Steps
3 Motivation 3 SARah, OHB Sentinel-1, ESA
4 Motivation 4 reliable high-speed data transfer protocol for Space based on Wizard Link (PHY) high reliability minimal overhead & low latency small footprint covering only OSI Layer 1 & 2
5 Radiation Effects - a Primer[1] 5 Total Ionizing Dose (TID) cumulative damage (rads) leakage current and threshold shifts Single Event Effects (SEE) Single Event Latch-up (SEL) Single Event Multiple Upset (SEMU) Single Event Upset (SEU) [1] from presentation Radiation Models and Hardware Design Some, Raphael
6 Error Control - Error Detection 6 Repetition codes Parity Bits Checksums Cyclic Redundancy Check Others: Error correcting codes
7 Error Control - Forward Error Correction 7 idea: increased Hamming Distance via encoding better Signal-to-Noise Ratio block codes convolutional codes
8 Error Control - ARQ 8 Stop-and-Wait:
9 Error Control - ARQ 9 Stop-and-Wait Go-back-N:
10 Error Control - ARQ 10 Stop-and-Wait Go-back-N Selective repeat:
11 Error Control - ARQ 11 Stop-and-Wait Go-back-N Selective repeat Hybrid ARQ: Normal ARQ vs. Hybrid ARQ, modified, from Error Control Coding Fundamentals and Applications - Shu Lin Fig
12 Existing High Speed Links Link OSI Layers covered Space Heritage Failure Detection SpaceFibre 1, 2, 3, 4 planned 16-Bit CRC ARQ Scheme modified Go-Back-N max. dist. via copper 10m 12 RapidIO 1, 2, 3, 4 yes 16-Bit CRC Go-Back-N 10m typ. Gigabit Ethernet 1, 2 little 32-Bit CRC none 25m/100m PCIe 1, 2, 3 little 32-Bit CRC Stop-andwait 1m - 7+m USB (3.0) 1, 2, 3, 4, very little 16-Bit CRC Stop-andwait 3m SATA 1, 2, 3, 4, very little 32-Bit CRC none 1m TLK yes no none 10m
13 TLK2711-SP - Wizard Link 13 family of multigigabit transceivers by Texas Instruments TLK Bit SERDES 8B/10B encoding LOS-Detection available as MIL-Grade (-SP) temperature hardend quality controlled vibration resistant
14 TLK2711-SP - Wizard Link 14 TLK 2711-SP Block Diagram from Single Event Effects and Total Dose Test Results for TI TLK2711 Transceiver Fig. 1
15 Radiation and the TLK2711-SP 15 research from Koga, R. et. al. [1] : Bit errors 1-3 bits when registers get hit Burst errors bits when PLL ect. get hit Latch-Up-Immune no major bias current change at 140 krad TID [1] Single Event Effects and Total Dose Test Results for TI TLK2711 Transceiver Koga, R. ; Yu, P. ; George, J., In: Radiation Effects Data Workshop, 2008 IEEE, 2008, S
16 Further radiation analysis for TLK2711-SP 16 speculative Orbit: 1400km Ap.; 98 Inc.; 0 Arg. Pe.; Circular 7 years mission time; launch Radiation Model AP8, CREME96, geoshielding, quite magnetosphere Results: avg. Bit Errors: 3.4 Upsets/day avg. Burst Errors: 7.2 Upsets/day
17 Next Steps measure: time to sync, recovery from LOS behaviour near LOS 17 decide on: flow control symbols packet size Layer 2 error control scheme Hybrid or normal ARQ which scheme implement and test
18 Sources 18 Book: Error Control Coding Fundamentals and Applications - Shu Lin et. al. TLK2711-SP 1.6-Gbps to 2.5-Gbps Class V Transceiver. Texas Instruments datasheet, last revised Oct.2014,. see Radiation Models and Hard- ware Design Some, Raphael, presentation in 2002, see Some.pdf Single Event Effects and Total Dose Test Results for TI TLK2711 Transceiver Koga, R. ; Yu, P. ; George, J., In: Radiation Effects Data Workshop, 2008 IEEE, 2008, S
19 8B/10B encoding 19 used in serial transmissions DC-Balance limit on succesive 1 s / 0 s clock recovery data symbols (8 bit data 10 bit encoded) K-Chars byte alignment control symbols
20 OSI Model 20
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