Lesson One: Common Connection Interfaces

Question 1

What does USB stand for and what are the two most common types?

Answer 1

Universal serial bus.

2. 0 – 480 Mbps. Can be type A (4 pin, connection to host), B (4 pin, connection to device), B-mini (5 pin, smaller device, not used as much any more), or B-micro (updated mini).
3. 0 – 5000 Mbps. Often has a blue connector, supports legacy devices. Type As are the same shape, Type B/B-micros are not.

Question 2

What is a port?

Answer 2

Transfers electronic signals between a device (both internal and external) and the system unit. Either an electrically wired socket/plug or a wireless transmission device.

Question 3

What is a hub?

Answer 3

It provides ports for additional devices.

Question 4

What is an interface?

Answer 4

The point at which two devices connect and communicate with each other.

Question 5

What is Thunderbolt/Lightning?

Answer 5

Replaces USB on Apple devices. Apple proprietary connections.

Question 6

What is a serial port?

Answer 6

Also called RS-232 (recommended standard #232) or a COM port. Information is transmitted over 1 wire at a rate of 1 bit at a time. Start, stop, and parity bits are used to format and verify data.

Question 7

What does SATA mean and what is it used for?

Answer 7

Serial Advanced Technology Attachment. A standard connection for internal devices to desktops. Supports a single device.

Question 8

What does SCSI mean and what is it used for?

Answer 8

Small Computer Systems Interface. 320 Mbps, connected internal disc drives, not used very much these days.

Question 9

What is RJ-45?

Answer 9

RJ = registered jack. Twisted pair cables, where two copper wires are twisted around each other to minimalize electrical interference. Used for ethernet cables.