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NPort IA5150/5250 Series User’s Manual Choosing the Proper Operation Mode
4-5
Ethernet Modem Mode
Ethernet Modem Mode is designed for use with legacy operating systems, such as MS-DOS, that do
not support TCP/IP Ethernet. By connecting one of NPort IA5150/5250’s serial port to the MS-DOS
computer’s serial port, it is possible to use legacy software originally designed to transmit data via
modem, but now transmit the data over the Ethernet.
Reverse Telnet Mode
Console management is commonly used by connecting to Console/AUX or COM ports of routers,
switches, and UPS units. Rtelnet works the same as RAW mode in that only one TCP port is
listened to after booting up. The system then waits for a host on the network to initiate a
connection. The difference is that the RAW mode does not provide the conversion function
provided by Telnet. If the connected devices need to use the CR/LF conversion function when
controlling, then users must choose Rtelnet mode. In addition, since NPort IA5150/5250’s Rtelnet
mode is widely used in device management in Telecommunication control rooms, managers for
remote hosts can also use a Local User Table or RADIUS to identity verification methods.
Disabled Mode
When the Operation Mode for a particular port is set to Disabled, that port will be disabled.