Connecting Systems to a Remote Location

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Connecting Systems to a Remote Location:

There are various methods to connect systems to a remote location. From the network layer up, a remote connection is the same as a direct LAN connection, but the data-link and physical layers can differ.

Public Switched Telephone Network (PSTN): PSTN is a telephone service and uses copper-based twisted pair cable. A modem can be connected to the line to transmit data to any location. Connections are fed into a centralized locale where calls are then converted to analog and routed to their destinations. Modems convert the digital signals to analog, and transmit them over the PSTN. PSTN connections are slow. The quality of the connection depends on location and the state of the cables.

Most modems support the Plug and Play standard. Networks can detect and install the correct drivers for it. With external modems, the IRQ and I/O address are designated to the serial port that links the modem to the system. The system is supported by two serial ports and is assigned to: COM1 and COM2 share IRQ4, and COM2 and COM4 share IRQ3. A chip, universal asynchronous receiver-transmitter (UART), maintains communication.

A Virtual Private Network (VPN): VPN serves as the connection between a remote system and a server on a private network that uses Internet support. A remote user can access the Internet through a modem and connect to an ISP. A secured connection is then established between the remote system and network server to protect information that’s transmitted by using tunneling. The protocol that allows tunneling is the Point-to-Point Tunneling Protocol (PPTP). PPTP works with PPP to secure a connection between the client computer and a server. Once tunneling is activated the system transmits data by encapsulating the PPP data.

Integrated Services Digital Network (ISDN):


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