If you're accessing the internet using the same lines you have your phone plugged into, you've got a POTS connection. If you want someting faster, look into an ISDN or T1 connection. A small package of data sent across a computer network. RTP's are also used by long-distance networks. A type of electronic communication that, unlike parallel communication, requires that data bits be sent one after the other.
Modems rely on serial communication to send data over telephone lines.
Serial Line Interface or Internet Protocol, is one standard for connecting to the Internet with a modem over a phone line. If you happen to get a line with alot of noise or a not so great connection, you may have problems with a SLIP connection. In serial communications, a bit inserted into the data stream to inform the receiving computer that the transmission of a byte of data is complete. See asynchronous communication and start bit. URL's are the fixed formats that we all use to get the documents or files we want from the internet.