Multiplexing and (FDM , WDM and TDM) in Computer Network
For the better utilization of bandwidths multiplexing has been introduced . Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link.
Also whenever the bandwidth of a medium linking two devices is greater than the bandwidth needs of the devices, the link can be shared.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgc2oYXD2uxxtVWtUIoLkTtSj-Nt_tkb8pPr5bclFuSBnUQdt8TRNttKapjchDiRtdvUVlQGokET-07_sdIImcVwa-kJgdu-KkBbF_Es-091IqhZOW7-e13sVR0TGOiVN6j29TNVmZ0wUg/s1600/m1.JPG)
There are three basic multiplexing techniques :
- Statistical Time-Division Multiplexing
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjuCijpToWiGCILgUuoNkfehB2jRBOXR6bTKTNcyZ9AvdQKS1bogCCgSjnYRvV-dD3_ECTwTuqm7h7WT5tGoKUF7eyAXZ6VYiorhyphenhyphen1oJCNk-1kD609vz8JNV1lOpuAGPmgGhCJ-x8Dk78/s1600/m1.JPG)
Frequency-Division Multiplexing (FDM)
FDM is an analog technique that can be applied when the bandwidth of a link (in hertz) is greater than the combind bandwidths of the signals to be transmitted.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPkTEBkp5Uv8AZAsE_MasRd0VhF7bo7pYKB39eNyaj0iyf09nvXd9yvAqezrBWT6UnV-S9dgs9J_Xki0uNJ0HIfwsz2KOsCsKOaNL2DApE5_O0ZkelwIz_eVgAidv_SSC9P0D66BxOFEc/s1600/m1.JPG)
FDM is an analog multiplexing technique that combines analog signals.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJy7-nv4FFN6OMmFZZxZkVrC97y33Ar-MBnlUKXn5DVk1ExJBUptz0u2x2G1hGEB_RS_YMlfgCK8imOAoxA5nmYM0td7vfmn71OQdMl5XigIMwigkON3PB-V9zLJXbhCPutbeEwZo8e70/s1600/m1.JPG)
Example of a demultiplexing process -
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWjEfAnTkiKruhddsgakJH4gD_gzGlkq-Yc_30rPcGSZvXlWKFxQRCpXlvy5VzDxnxIjtrebKAxsuu6BrcAQMwEQwcEgH483TPDY6HR0lB-QeIfV_HcWn8hR484IQ2g3uGnNfvr8MEKTs/s1600/m1.JPG)
Analog Hierarchy
Consider this hierarchical systems which is made up of groups, supergroups, master groups , and jumbo group.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjXK5Rq8TxpLnLKCbTuO9rtS6suIWZSx7DbzJiTM3mTmEn-_jSFeke9BjUj6Y3cQuTA7OpBaSmjS3SlVVHYUfYgYdAuFQaTDGX8-bRO47cluAsXB_wuLo_v6_7r-QUQKLWUXo84G1gJdXs/s1600/m1.JPG)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiHfyXgu8JHLammiDaEak1C9l0scoA8jPBFB7l3oC4c7EDNQBSPbYgAOgvaYu6BPr_CoOcaFLIN89F2IkVLlwTF57x2F55Jcv3zhHmLwjjDZ0wGEXe6t2f5LXNiyMmJY-HdJMtsKw9E4mY/s1600/m1.JPG)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjp2rBtzDU8D3ntle19WMe6dSbkjpXWJsGxBr2nz9KubPX9nWIXNG4UHsJUglPW_Vx6E1bvKNo7rIVmnWbnOUNP3DNacGwVa8UwQ_tNwizmBkdxmI6WKGezBScoF1ab2w0c6Pn2-Y-TnSI/s1600/m1.JPG)
Also whenever the bandwidth of a medium linking two devices is greater than the bandwidth needs of the devices, the link can be shared.
There are three basic multiplexing techniques :
- Frequency-Division Multiplexing (FDM)
- Wavelength-Division Multiplexing (WDM)
- Time-Division Multiplexing (TDM)
- Statistical Time-Division Multiplexing
Frequency-Division Multiplexing (FDM)
FDM is an analog technique that can be applied when the bandwidth of a link (in hertz) is greater than the combind bandwidths of the signals to be transmitted.
FDM is an analog multiplexing technique that combines analog signals.
Example of a demultiplexing process -
Analog Hierarchy
Consider this hierarchical systems which is made up of groups, supergroups, master groups , and jumbo group.
No comments