(4TH LEC) Analog and Digital?
What is analog...?
- analog is continuously movement
- in this case we have value on every point.
What is digital...?
- Digital is not continuously movement
- in this case we have not value on every point.
(3RD LEC) MODEM
What is modem?
A modulator-demodulator. An electronic device that allows computers to
communicate over the telephone wires or cable TV cable. One of the modem
converts the digital signals(which
cannot be sent over telephone lines effectively)
into analog signals (which may be).
into analog signals (which may be).
There are two concepts are involve in the concept of modem
1 1) Modulation 2) Demodulation
Modulation:
Insertion of carrier on data
Demodulation:
Removing the carrier from data
(1ST LEC)WHAT IS NETWORKING(
NETWORKING
There are two things involve in networking1) Connectivity
AND
2) Communication
for purpose of better understanding we take a example (NON-TECHNICAL EXAMPLE)
 |
| FIG 1.1 |
it is connectivity these two guyz connected with each other.
now come on communcation:
 |
| FIG 1.2 |
it is communication these two guyz are communicate with each other.
IT IS OUR TODAY TOPIC ,IN NEXT LECTURE WE COME ON THE TECHNICAL EXAMPLE