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so what's the difference between multiplexing and multiple access in communication systems and it really comes down to multiplexing is a term that's used when you've got a point-to-point link so you're gonna have control over putting multiple data streams together in a device called a multiplexer often mux is used and it's over a single link and then you have a d mux at the other end to go back to the individual data streams and so you've got a high rate link in the middle and you've got lower rate links coming in so this is often the case in in a network where you have low rate links from the access part of the network and in the multiplexer you access a high rate link as a backhaul into the core of the network for example and then you recover the original streams at the output this could be an optical fiber these could be optical fibers so we could do it in two different ways uh one is uh timed way where we send the data at higher rates on this high rate link this is a time sending the bits at faster rates over bigger bandwidth or we could divide that's in time or we could divide up the frequency and give each their own frequency these come in on different frequencies in optical fibers different colors of light and we put them all multiplexed over the uh the high rate optical fiber so this is multiplexing and multiple access is the case where you've you don't have a single device that's putting all of those signals together so let's say three mobile phones here's a mobile phone tower and they are all accessing the air channel between the mobile devices and the tower and so what happens here the same thing these are we can we have that these are low rate signals in comparison to the bandwidth of the channel if we try if we're going to get them all through and the difference being here that we don't coordinate we can't it's not so easy to coordinate all these users on the multiple access channel we can still do put things like the first one we send at a higher symbol rate so these send faster their digital bits send faster and then leave a gap of time and this is called time division multiple access so you have a fast rate time symbol in the channel compared to the rates of each individual user or we can have frequency division multiple access just like we had over here with the optical where each user gets their own frequency band this is in the frequency this is in the time where you can also have code division multiple access where each user sends all of the time all across all of the frequencies but differentiates differentiates themselves by a code and of course these ones are all going to require some level of coordination in the network or we could have an uncoordinated one like carrier sense multiple access so these ones are used in cellular and this one here the carrier sense multiple access where you sense whether a carrier is active and then you send a packet but you could have collisions and this is used in wi-fi and so if you have a coordinated you can try to minimize interference and also you try to minimize here but it's in a less coordinated or totally uncoordinated way as long as you adhere to the standard of how you access the channel the main difference being that you don't have coordination and you have interference in the multiple access case so don't forget to like this video it helps others to find it and subscribe to the channel for more videos