Transmission Modes
Baseband Transmission
- Entire bandwidth of the channel is used to send one signal at a time
- Data is sent as digital signals
- Used in LAN(Ethernet)
- In coaxial or twisted pair cables
- Transmission distance is limited as digital signals decay easily
- simpler and cheaper
Info
XBaseY -> Ethernet Cable
- X refers to the speed or bandwidth
- Base marks the cable as Base band
- Y refers to the maximum distance in 100 metres
Info
- Y can be replaced by
- T => It is Twisted pair cable
- FX => It is optical fibre
Example
10Base5
- 10Mbps
- 500 metres
Example
10GBaseT
- 10Gbps
- Twisted pair cable
Example
10GBaseFX
- 10Gbps
- Optical Fibre
Broadband Transmission
- The channel is divided into multiple frequency ranges using Frequency Division Multiplexing(FDM)
- Each frequency band carries a separate analog signal (can carry modulated digital signals also)
- Used in WAN, Cable TV ...
- Multiple signals can travel simultaneously over the same medium
- Longer distance possible due to analog modulation
- More complex and costly
Info
Device to transform
- digital data into analog signals => Modem
- analog data into digital signals => Codec (Coding, Decoding)