In order for dial up modems to work
properly with the dial-up network the parameters, such as serial
ports, IRQs, and I/O addresses must be configured properly. Modems
(Modulators/Demodulators) use a serial port for connection and attempt
to use COM1 as its default. The EIA/TIA 232 serial standards determine
how to connect a modem to a computer.
Serial ports, which are based on DB-9
(nine pins) or DB-25 (25 pins) connectors, are commonly known as COM1,
COM2, COM3, and COM4 ports. Data terminal equipment (DTE) represents
the computer side of the connection, while the data
circuit-terminating equipment (DCE) represent the modem connection. Modems
should be set properly; depending on the serial port, modem set up can be done
through the start menu/control panel/modems.
Interrupt Request Levels (IRQs) provide
a device a way to send interrupt signals to a computer. In many cases, for more than
one (if not all) attempts to transfer data into a CPU, each device is issued an
IRQ. An
input/output (I/O) address, a four digit hexadecimal number, enables
the flow of data within the computer: Addresses are used to select the information to be accessed in memory or peripherals.
The maximum port speed is the speed a modem can support in kilobits per
second. An analog line, also
known as a regular telephone line, can support speeds up to 56
kilobits per second using an analog modem.
The requirements for remote connection
include:
- The user must have a valid ID and
password in order to access the network remotely. This includes
accounts with PPP, SLIP, or RAS.
- A remote server must be available to
be accessed.
- The appropriate hardware device,
such as a modem or ISDN line must be enabled in order to
communicate with the server.
- Network protocols must be configured
in order to access the remote server or network
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