Transmission of Data

Transmission of Data

1. Full Duplex

   • Can communicate in both directions at once
   • Examples
     • Mobile phones
     • Telephones
     • Standard network communications

2. Half Duplex

   • Can communicate in either direction but only in one direction at a time
   • Examples
     • Walkie talkies Or CB radios
     • Push to talk devices

3. Simplex

   • Can only communicate in one direction from a sender to a receiver
   • Examples
     • Baby monitors
     • GPS
     • Satellite TV
     • CCTV

4. Point to Point (PTP)

   • Any communication on a dedicated channel, such as data sent over a telephone line between two computers, or two PCs communicating over an RS232 cable or a PC connecting to an ISP over DSL is point to point. Peripherals such as hard disk controllers using, for example SATA can also communicate directly over a dedicated PTP channel.

5. Multi-drop and multi-point

   • These are communication channels with multiple end points. The term multi-drop channel is usually used for confiurations with one master and many slaves such as a mainframe with multiple terminals, and the term multi-point for a standard distrubitied network channel. Peripheral controllers use multi-drop for PCI and PATA.