SpaceWire link is used to enable the reliable transmission of data at high speed (between 2 Mb/s and 400 Mb/s) from one unit to another. SpaceWire links are full-duplex, point-to-point, serial data communication links. Advantages Near constant total drive current (+3,5 mA for logic 1 and -3,5 mA for logic 0) which decreases switching noise on power supplies. High immunity to ground potential difference between driver and receiver. LVDS can tolerate at least ±1 V ground difference. High immunity to induced noise because of differential signalling normally using twisted-pair cable. Low EMI because small equal and opposite currents create small electromagnetic fields which tend to cancel one another out. Not dependent upon particular device supply voltages. Simple 100 Ohms termination at receiver. Power consumption is typically 50 mW per driver receiver pair for LVDS compared to 120 mW for ECL or PECL. Cable Construction Cable made with 4 shielded twisted pair Expanded PTFE tape Shielding braid Outer jacket : PFA 9 way micro D connector (15 way for special applications) Backshell for shield termination - Operating temperature : - 200°C/+ 180°C (for the cable), - Impedance (between wires) : 100 Ω +/- 6 Ω at 400 MHz. - Analysis means and tests for high speed PRBS signals up to 3.4 Gb/s. - Measurements : eye pattern, jitter, Zc TDR, BER,… Approvals ESCC3902.003 for the cable ESA EPPL2 list for the connectors PID (Process Identification Document) C.N.E.S ( French ESA representative agency ) Know how agreement ASF N°13-36 for complete harness assembly.


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