These are Active cables. They cost more than similar cables for DisplayPort and USB. There is a limit of six (6) devices that are plugged in a daisy chain to any Thunderbolt port. It can also supply power through to any devices plugged to that port. ![]() (There are still some fibre optic cables available, but power cannot be transmitted through them.) The cables are bi-directional, and each Thunderbolt port supports two channels, which means the port can send and receive data simultaneously. Thunderbolt supports Data, Video, Audio, and Power from a single port. ![]() One connector supports up to six (6) devices through various topologies. Thunderbolt combines PCI Express (PCIe) and DisplayPort (DP) into one serial signal alongside a DC connection for electric power, transmitted over one cable. It uses the same connector as Mini DisplayPort (MDP). Thunderbolt is a hardware interface that allows for the connection of devices to a computer. Thunderbolt is a revolutionary I/O technology that supports high-resolution displays and high-performance data devices through a single, compact port. ![]() It is still tied into the PCIe signal and is ideal for 4K graphics. It was discovered that copper was cheaper and still provided the high speeds that were required. ![]() Note: Thunderbolt was conceived as an optical technology and was intended to run exclusively on optical fibre cable and use an Optical Physical Layer.
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