Why is the price of Apple's fast charging data line very expensive?

Apple announced its Black Friday promotion, which starts on Black Friday (November 29) and ends on Cyber Monday (December 2).

Specifically, the company will offer up to $200 gift cards for specific Apple products (such as iPhones, iPads and MACS), and the exact details of the event have not yet been announced. Apple said that the value of gift cards varies according to the product purchased, so please pay attention to the wording "at most", while some of Apple's latest products are likely not eligible for any gift cards.

Gift card is a common way for apple to promote holiday shopping. Apple does not reduce the price of the product, but gives a gift card when buying. The $200 gift card means users can get a pair of airpods "free" from Friday to Monday.

 

Apple shopping is held in many parts of the world, with gift cards of up to 160 pounds in the UK, 200 euros in Europe and 280 Canadian dollars in Canada.

 

In fact, Apple's black five promotion is generally less competitive than Amazon and other companies.

Why is Apple's fast charging data line so expensive?

USB B interface has various shapes, but in fact, it supports few protocols. Many users have formed the inherent impression that a shape of interface corresponds to a protocol.

But in fact, no matter USB 2 or USB 3 protocol, in addition to the common type-A, micro-b and type-C interfaces, there are many interfaces that are not often contacted, and the shape of the type-A ports of the two protocols is almost the same. Therefore, the shape of USB interface has nothing to do with the protocol it supports.

USB type-C is just an interface form and cable specification. The protocol behind it may be USB 3 protocol, USB 2 protocol, or even thunderbolt 3 and future USB 4 protocol.

data transmission

The main purpose of USB protocol is to transmit data. The essential difference brought by different USB standards is the transmission rate. Generally speaking, in the same series of naming, the larger the number, the faster the transmission of numbers. Display transmission

 

The USB type-C interface can also be used for display transmission. Due to the large number of pins, it can enter alt mode to transmit the display image.

 

However, not all usb-c devices support alt mode, image transmission is only an option for major manufacturers, so it is necessary to know whether the cable supports it when purchasing the device.

 

Audio transmission

iPhone Charger Cable

USB also supports the transmission protocol for audio, which is convenient for devices like microphone, speaker, headset and telephone to transfer audio stream directly to other devices by using analog signal, and even can be used across platforms without any driver.

In addition, with the help of USB type-C, the player can directly transmit the digital signal of audio information to the supported audio output devices such as headphones, so as to ensure the minimum interference in the transmission process. In daily use, you may need to pay attention to the specific audio protocol used in the output of the device. If the device only supports digital mode output audio devices, then the adapter must have a digital to analog converter and an operational amplifier, otherwise you will not hear any sound.

iPhone 12 charger cable

In order to ensure the maximum compatibility, usb-if stipulates that the headset with USB type-C interface as input must support both digital audio mode and audio adapter mode.

Power transmission

The standard power supply protocol of USB itself is now incorporated into USB power delivery. At present, USB power delivery has been updated to 3.0 protocol, which supports four voltage levels of 5V, 9V, 15V and 20V, with a maximum power output of 100W.

The devices currently on sale by apple are already compatible with the PD fast charging protocol.