1. Communications systems
Communications systems have four basic elements
a) Sending and receiving devices
- Often a computer or specialized communications device.
b) Communication channel (aka transmission medium)
- The actual connection that carries the message
- Can be a physical wire, or a wireless connection
c) Connection Device (aka communications device
- Act as an interface between the sending and receiving devices. They convert outgoing messages into a digital format, and back again at the receiving (incoming) end.
d) Data transmission specifications
- The rules and procedures that coordinate the sending and receiving devices by precisely defining how the message will be sent across the communication channel.
