Single-port terminal servers
Single-port terminal servers are used for network-enabling serial communication gadgets. They have enclosures capable of mounting onto panels. They have built-in flash memory and RAM, and Fast Ethernet, Ethernet, RS-485, RS-232, RS-422, HTTP, Telnet, SNMP, and TCP/IP data link, transport/network, and remote management protocols.
Multi-port terminal servers
Multi-port terminal servers have up to 16 ports. They have all the features of single-port models, but they also include external power supplies for handling multiple terminals.