Test 1 Flashcards
1
Q
Common Voltages for 1/0
A
+ 12v / -12v
+3v / -3v
+5v / 0
2
Q
Asynchronous
A
Transmissions are synchronized by special signals along the transmission medium.
- UART
- RS232
- Serial
3
Q
Synchronous
A
Transmissions are synchronized by an external clock.
- SPI
- I^2C
4
Q
UART
A
Universal Asynchronous Receiver/Transmitter
5
Q
RS232
A
Null
6
Q
Serial
A
One bit after the other
7
Q
SPI
A
Serial Peripheral Interface
- 3 Wires + 1
1. Data coming out (MOSI)
2. Data coming in (MISO)
3. CLK (Clock)
4. Select / Enable / Slave Select / Chip Select
8
Q
I^2C
A
Integrated Circuit
- Select up to 127 devices protocol
- 2 wires
1. Data wire going both ways
2. CLK or SCK
9
Q
AM vs. FM
A
AM - Amplitude Modulation. Very simple, short range.
FM - Frequency Modulation. More sophisticated, longer range.
10
Q
OSI Network Model
A
- Application Layer
- Presentation Layer
- Session Layer
- Transport Layer
- Network Layer
- Data Link Layer
- Physical Layer
11
Q
Speeds of Communication
A
Sound ~ 1ft/ms
Light/Electricity ~ 1ft/ns
