Cisco GLC-SX-MM In the simple words, transceivers have been user-friendly since early 20's but were large, bulky, complex bits of hardware. it is located in many products in one way or another nowadays. The biggest example of that is a computer which you are using to read this content right now. These transceivers are also present inside telephones and radios which are frequently used by every person. Previously one needs to hook two different systems and each side has to use the cable to communicate and create transmission energy which was the ineffective and problematic method. The cost was higher since multiple components had to be installed on a complex card which would make it work. But these days, many transceivers are built to resolve these issues and one of them is Cisco glc-sx-mm.