The 7 Things I Know About Cyber Security After 25 Years | April 2024
Multiplexing
1.
2. It is a technique which allows to send multiple signals
over a single data link.
Multiplexer
It is a device that combine multiple signals into one
signal.
Demultiplexer
It is a device that separate the multiplexed signal.
3.
4.
5. When the carrier is frequency, FDM is used. FDM is an
analog technology. FDM divides the spectrum or
carrier bandwidth in logical channels and allocates one
user to each channel. Each user can use the channel
frequency independently and has exclusive access of it.
All channels are divided in such a way that they do not
overlap with each other. Channels are separated by
guard bands. Guard band is a frequency which is not
used by either channel.
6.
7. Time Division Multiplexing TDM is a digital
multiplexing. Every transmitter is assigned a
time slot to transmit its signals.
TDM has further two types.
1. Synchronous TDM
2. Asynchronous TDM
8.
9. It is an analog technique. It combine multiple
wavelength of optical signal to transmit in a
single optical fiber.
