ICT lesson, 18 May Notes

1. Equipments - Modem

Modem = Modulator - Demodulator
PC -> Switch -> Router -> Modem -> Internet
Transfer by 0 and 1
PC to Router signal != Modem to internet signal
Translate analog to digital signal & digital to analog signal
Extra: Router is not really needed
- Since router groups all LANs into one, if you only have 1 LAN device you can use Switch only and skip Router.

Optical Fiber
- Transfer data by light and reflection with glass
- Super fast
- Super expensive (extra equipment is needed)
- Mouse can bite the cable
Coaxial Cable
- Cable TV Connections
Twisted Pair (STP / UTP, CAT1 - CAT7)
- Cheaper
- Reasonable speed
- Easy to set up