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Unusual connectors, cables and adapters have always been talked about in connection with Apple products, but in recent years it seems to be on the rise. Apple's thinking in this is quite innovative, but controversial, especially on new MacBook Pros. What exactly is Thunderbolt 3?

First, in 2014, Apple introduced a 12-inch MacBook containing only two connectors, USB-C and a 3,5 mm headphone jack. Other devices also underwent reductions in the number of connectors – loudest iPhone, the latest MacBook Pro. The new models from last month have only two or four USB-C type connectors with Thunderbolt 3,5 interface, in addition to the 3mm output for audio. This is a new standard developed by Intel to provide the most powerful and compatible interface (data transfer medium) and connector (physical interface proportions).

Thunderbolt 3 really meets these specifications – it is capable of transferring data at speeds of up to 40Gb/s (USB 3.0 has 5Gb/s), includes PCI Express and DisplayPort (fast data transfer and audiovisual single transfer) and can also supply power up to 100 watts. It also supports up to six-level chaining in series (daisy chaining) – connecting other devices to previous ones within the chain.

In addition, it has the same connector as USB-C, which is supposed to be the new universal standard. The downside of all these great parameters and versatility is, paradoxically, compatibility. Users must be careful about which cables they use to connect which devices. In addition, if they have a MacBook with USB-C and not a MacBook Pro with Thunderbolt 3, they have to be careful what devices they want to connect to it in the first place.

Until now, the rule that if the connectors correspond in shape, they are compatible has been quite reliable. Now users need to realize that a connector and an interface are not the same thing - one is a physical proportion, the other is associated with technological functionality. USB-C has a bus capable of combining several lines for data transfer of different types (transfer protocols). It can thus combine USB, DisplayPort, PCI Express, Thunderbolt and MHL protocols (a protocol for connecting mobile devices with high-resolution monitors) into one type of connector.

It supports all of these natively - data transfer does not require conversion of the signal to another type. Adapters are used for signal conversion, through which HDMI, VGA, Ethernet and FireWire can be connected to USB-C. In practice, both types of cables (for direct transmission and adapters) will look the same, but work differently. HDMI announced native USB-C support recently, and monitors capable of using it are said to appear in 2017.

However, not all USB-C connectors and cables support the same data or power transfer methods. For example, some may only support data transfer, only video transfer, or offer only limited speed. The lower transmission speed applies, for example, to the two Thunderbolt connectors on the right side of the new one 13-inch MacBook Pro with Touch Bar.

Another example would be a cable with Thunderbolt 3 connectors on both sides looking exactly the same as a cable with USB-C connectors on both sides. The first can transfer data at least 4 times faster, and the second may not work for connecting peripherals with Thunderbolt 3. On the other hand, two identical-looking cables with USB-C on one side and USB 3 on the other side can also fundamentally differ in transfer speed.

Thunderbolt 3 cables and connectors should always be backwards compatible with USB-C cables and devices, but the reverse is not always the case. Therefore, users of the new MacBook Pro may be deprived of performance, users of 12-inch MacBook and other computers with USB-C may be deprived of functionality if the wrong choice of accessories is made. However, even MacBook Pros with Thunderbolt 3 may not be compatible with everything - devices with the first generation of Thunderbolt 3 controllers will not work with them.

Fortunately, Apple has prepared for the 12-inch MacBook instruction with a list of reducers and adapters it offers. USB-C in the MacBook is natively compatible with USB 2 and 3 (or 3.1 1st generation) and with DisplayPort and through adapters with VGA, HDMI and Ethernet, but it does not support Thunderbolt 2 and FireWire. Information on MacBook Pros with Thunderbolt 3 are available here.

Apple reducers and adapters are among the more expensive, but they guarantee the indicated compatibility. For example, cables from the brands Belkin and Kensington are also reliable. Another source might be Amazon, which is a good place to keep an eye on review eg from Google engineer Benson Leung.

Source: TidBITSFosketts
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