GLENAIR
computer uses to exchange data between the main board and its daughter cards, such as a memory or a graphics card. The connector itself is usually a set of gold pads on the edge of the daughter card that plug directly into a socket on the mother board. There is a separate area of the connector for power supply and bus management, followed by clock and signal pairs. The size of the bus is measured in number of lanes, each lane consisting of two differential pairs (transmit and receive). The bus may not run all the pairs available mechanically, so it’s possible to have an X16 bus running only at X4. The data rate in PCI protocols is expressed in transfers per second instead of bits per second. For the hardware engineer, transfer-per-second is the same as bits-per-second. This is different for software engineers, because all bits are not data, i.e. there is coding overhead. A 2.5 Gb/s link only really transmits 2.0 Gb/s because of the overhead required.
Flight-Grade 100 Ohm Ethernet Cable 963-033 S/FTP Cable GLENAIR SIGNATURE CABLE FOR HIGH-SPEED PROTOCOLS 24 and 26 AWG. S/FTP construction, foil shielded data pairs. High performance shielded cable is AS6070/5 and /6 approved. 963-003 and 963-037 S/UTP Cable 24 and 26 AWG. S/UTP construction with fluoropolymer spline. Meets FAA flammability requirements. 90 Ohm USB 3.0 Cable 963-110 Flight-Grade Cable High temperature, high performance, fluoropolymer aterials, shielded. High speed pairs have braid shields. -65° to +200°C. 963-118 Commercial-Grade Cable Black PVC jacket, foamed PE wire insulation. High speed pairs have foil shields. 0 to +80°C. construction with foil shielded data pairs. High performance cable offers three jacket material options. 963-127 S/FTP HDMI and DP Cable 26 AWG, S/FTP construction, foil shielded data pairs and overall 36 AWG tin/copper. Jacket available in three material options. 963-122 S/FTP High-Speed Cable 4 data pair 26 AWG, S/FTP construction, foil shielded data pairs and overall 40 AWG silver plated copper braid. Three jacket material options. 963-033 S/FTP High-Speed Cable 26 AWG, S/FTP construction, foil shielded data pairs and overall 40 AWG silver plated copper braid. Three jacket material options. 963-043 S/F Parallel Pair High-Speed Cable 26 AWG, 1 pair S/F construction 100 Ohm, HDMI, DP and SATA Cables 963-120 S/FTP HDMI and DP Cable Aerospace grade 26 AWG, S/FTP
Data Rate (including overhead)
PCIe version
Introduced
1
2003 2007 2010 2017 2019
2.5Gb/s 5Gb/s 8Gb/s 16Gb/s 32Gb/s
2 3 4 5
RapidIO RapidIO is another “inside the box” data protocol. It is also used inside systems to transport data among memory and computing chips, be it on a large circuit board, from one board to another or through a backplane. The specification does not call out a connector or cable, instead it relies on electrical compliance to other specifications such as 10GBASE-KR (or 40GBase-KR). Those in turn essentially analyze the eye-diagram and set acceptable signal levels for the transmission. The implementation is often described by the number of lanes, each running maximally at 6.25Gb/s, 10.3Gb/s or 25.3Gb/s (for generation 2, 3, and 4 respectively). RapidIO deserves special attention because it is the protocol of choice for space applications and has
been utilized in many military platforms as well.
QwikConnect • July 2020
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