5 difference between dial up connection …

<font color="red"> Leased Line</font>
<font color="blue "> 1:Always connected, unless a system administrator or power failure takes the leased-line down.
2:Uses synchronous and asynchronous communications. For asynchronous communications, a long-haul modem is often used.
3:Rented from a provider.
4:Requires synchronous units.
5:Requires synchronous ports, which are common on most SPARC systems. However, synchronous ports are not common on x86 systems and newer SPARC systems.
font color="red">Dial-up Line</font>
<font color="blue "> 1:Initiated on demand, when a user tries to call a remote peer.
2:Uses asynchronous communications.
3:Uses existing telephone lines.
4:Uses less costly modems.
5:Uses standard serial interfaces that are included on most computers.