chapter 4: connectionsziarko/cs335/cs335_wz4.pdf · 2005. 3. 1. · 4 faxes • bit map used to...
TRANSCRIPT
1
Chapter 4: Connections
Telephones
2
Telephone Network
Cellular Grid
3
Cellular Connections
Faxes
4
Faxes• Bit map used to represent a picture• Typical resolution of 200 dpi• Typical sheet requires about 3740000 dots (pixels)• It would about two minutes to send one sheet at 33.6 kbps
Transmission Modes
5
Asynchronous Transmission
Asynchronous Transmission
6
Synchronous Transmission
Communication Directions
7
Interface Standards
EIA/RS232 Standard
8
RS232 Standard Signaling
9
Null Modem
Balanced vs. Unbalanced Signal
10
X.21 Interface
X.21 Interface Signaling
11
USB Connections
USB Wires
12
USB Plugs
FireWire-IEEE 1394 Standard
13
Data Strobe Encoding
Multiple FireWire Buses
14
Multiplexing
Multiplexing Low Speed Devices
15
Amplitude Modultion
Modulation Principles
16
Frequency Division Multiplexing
Time Division Multiplexing
17
Statistical Time Division Multiplexing
Wave Division Multiplexing
18
Wave Division Multiplexing
T1 Digital Carrier DS1 Frame
19
T1 Digital Carrier
Other Carriers
20
Contention Protocols
No Protocol …
Contention Protocols
Protocol Present …
21
Aloha Protocols
Pure Aloha vs. Slotted Aloha
22
Pure Aloha vs. Slotted Aloha
CSMA and Aloha Protocols
23
Collision Detection
Token Ring Network
24
Summary of Contention Protocols