PortServer TS M MEI from Digi offers Ethernet and RS-232/422/485 serial connections, with the added flexibility of an internal modem for dial-up connectivity to remote serial devices. The modem extends TCP/IP communications over a standard phone line, which creates a backup connection in case the primary Ethernet connection fails. It utilizes SSH for creating secure IP network over serial connection. The patented RealPort technology makes it possible to establish a connection between the host and networked serial device, allowing software applications to work with networked device servers instead of requiring a host adapter.