Modem, NIC card And Network devices




Modem
Do modulation
D2A and A2D converter
Mode+demod=modem










3 types of modems
External  direct connect modem
Internal direct connect modem

Acoustic coupler modem






External dcm are housed in external cabinet
Internal dcm are plugged in pc slot or on board
Fewer cables less expensive
Both have own processor , storage, and communication circuit for dial , answer ,disconnect.

Effective

Can tap into strength of different technologies.
Combines features of multiple topologies.
Fault tolerance from star
Data reliability of ring
Network extension of bus
Simplicity of star


Network devices.

Node:












Any device connected to a network
Or
Any device having IP address.








NIC card

Used to connect to LAN
May be designed for special type LAN or general LAN.









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