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Network Technology -- Point-to-Point Data Links

These are the most basic data communications links, eg:
Point-to-point data link
Virtually all computers support such data links, using their so-called serial ports. Typically, these ports are able to operate at any standard bit rate between 300 bps and 230400 bps.
 
The most common hardware interface standard used in such data links is called RS232: in fact, the term RS232 port is widely used as a synonym for serial port.
 
A connection may be "direct" or may use a modem.
 


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