3.4.3 Digital Transmission
Digital transmission is the transmission of binary electrical or light pulses in that it only
has two possible states, a 1 or a 0. The most commonly encountered voltage levels range
from a low of +3/−3 to a high of +24/−24 volts. Digital signals are usually sent over
wire of no more than a few thousand feet in length.
![unit 2 DCCN (8)](https://arbinddotblog.files.wordpress.com/2020/06/unit-2-dccn-8.jpg)
![unit 2 DCCN (9)](https://arbinddotblog.files.wordpress.com/2020/06/unit-2-dccn-9.jpg)
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Multiplexing
![unit 2 DCCN (16)](https://arbinddotblog.files.wordpress.com/2020/06/unit-2-dccn-16.jpg)
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![unit 4 DCCN (8)](https://arbinddotblog.files.wordpress.com/2020/06/unit-4-dccn-8.jpg)
![unit 4 DCCN (9)](https://arbinddotblog.files.wordpress.com/2020/06/unit-4-dccn-9.jpg)