T2 Security Chip

The Apple T2 Security Chip is Apple's second-generation, custom silicon for Mac. By redesigning and integrating several controllers found in other Mac computers—such as the System Management Controller, image signal processor, audio controller, and SSD controller—the T2 chip delivers new capabilities to your Mac.

For example, the T2 chip enables a new level of security by including a secure enclave coprocessor that secures Touch ID data and provides the foundation for new encrypted storage and secure bootcapabilities. And the T2 chip's image signal processor works with the FaceTime HD camera to enable enhanced tone mapping, improved exposure control, and face-detection–based autoexposure and auto white balance.

Computers that have the Apple T2 Security Chip

These Mac computers have the Apple T2 Security Chip:

• iMac introduced in 2020

• iMac Pro

• Mac Pro introduced in 2019

• Mac mini introduced in 2018

• MacBook Air introduced in 2018 or later

• MacBook Pro introduced in 2018 or later

You can also use System Information to learn whether your Mac has this chip:

1. Press and hold the Option key while choosing Apple () menu > System Information.

2. In the sidebar, select either Controller or iBridge, depending on the version of macOS in use.

3. If you see "Apple T2 chip" on the right, your Mac has the Apple T2 Security Chip.

1000BASE-T

100BASE-TX and 1000BASE-T were both designed to require a minimum of category 5 cable and also specify a maximum cable length of 100 metres (330 ft). Category 5 cable has since been deprecated and new installations use category 5e.

10GBASE-T

10GBASE-T uses the IEC 60603-7 8P8Cmodular connectors already widely used with Ethernet. Transmission characteristics are now specified to 500 MHz. To reach this frequency Category 6A or better balanced twisted pair cables specified in ISO/IEC 11801 amendment 2 or ANSI/TIA-568-C.2 are needed to carry 10GBASE-T up to distances of 100 m. Category 6 cables can carry 10GBASE-T for shorter distances when qualified according to the guidelines in ISO TR 24750 or TIA-155-A.

GIGO

In computer science, garbage in, garbage out (GIGO) is the concept that flawed, or nonsense input data produces nonsense output or "garbage". In the UK the term sometimes used is rubbish in, rubbish out (RIRO).

The specific phrase is accredited by FOLDOC to the late Wilf Hey, who is also accredited by FOLDOC for work in developing RPG while working at IBM in 1965.

The principle also applies more generally to all analysis and logic, in that arguments are unsound if their premises are flawed.

deadman’s switch

A dead man's switch (for other names, see alternative names) is a switch that is designed to be activated or deactivated if the humanoperator becomes incapacitated, such as through death, loss of consciousness, or being bodily removed from control. Originally applied to switches on a vehicle or machine, it has since come to be used to describe other intangible uses like in computer software.

em dash

An em is a unit in the field of typography, equal to the currently specified point size. For example, one em in a 16-point typeface is 16 points. Therefore, this unit is the same for all typefaces at a given point size.

The em dash (—) and em space ( ) are each one em wide. 

Typographic measurements using this unit are frequently expressed in decimal notation (e.g., 0.7 em) or as fractions of 100 or 1000 (e.g., 70/100 em or 700/1000 em). The name em was originally a reference to the width of the capital M in the typeface and size being used, which was often the same as the point size.