Your UPS must have one unique IP address for use on a TCP/IP network.

Specify the Gateway address for connecting to devices or hosts attached to different network segments.

The Subnet Mask parameter identifies the class of the sub-network the UPS is connected to.
Basically 255.255.0.0 is used for a B class network.

Telnet Connection, if enabled will allow a terminal emulation  to connect to server application through the network.

BootP/DHCP connection, if enabled will provide dynamic attribution of an IP address to the UPS a BootP server or a DHCP server.

Network Upgrade, if enabled will provide download facility to upgrade the communication firmware through the network.

Security: Login/password Authentication will be asked to the administrator after clicking on Save changes before saving the modifications.