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+general purpose
+This category contains general-purpose operating systems like Linux and
+Windows. In the nmap-service-probes file this class is indicated by a
+lack of a
+d//<indexterm><primary><literal>d//</literal> (device type) version detection field</primary></indexterm>
+field.
+
+bridge (15)
+A bridge combines two or more subnetworks into one. With a bridge this
+happens at a lower level than with a router. This category also includes
+things like Ethernet-to-serial bridges.
+
+broadband router (241)
+Devices in this category connect a network to the Internet via cable,
+ADSL, fiber optics, etc. Some of these devices provide network address
+translation, a firewall, port forwarding, or other services.
+
+firewall (128)
+A firewall controls what traffic is allowed into or out of a network.
+Some also have additional capabilities. This category doesn't include
+general-purpose operating systems that happen to come with a firewall,
+but it does include OS distributions purpose-built to work only as a
+firewall.
+
+game console (16)
+A video game console like the Xbox or PlayStation.
+
+hub (1)
+A hub joins network segments by re-broadcasting all traffic. Hubs are
+distinct from switches, which selectively transmit packets only to
+relevant destinations.
+
+load balancer (17)
+A device that distributes inbound traffic to multiple devices to ease
+the load on those devices.
+
+media device (150)
+This category includes all kinds of audiovisual equipment, including
+portable music players, home audio systems, TVs, and projectors.
+
+PBX (21)
+A private branch exchange, or PBX, routes telephone calls within a
+private organization and connects them to the public telephone network
+or VoIP.
+
+PDA (12)
+A handheld computer. Devices that are also telephones go in the "phone"
+category.
+
+phone (22)
+A network-capable telephone that is not a VoIP phone. Devices in this
+category are typically mobile phones.
+
+power-device (45)
+Miscellaneous power devices like uninterruptable power supplies and
+surge protectors.
+
+printer (371)
+Network-enabled printers, including printers with an embedded print
+server.
+
+print server (100)
+A print server connects a printer to a network. Printers that contain
+their own print server go in the "printer" category instead.
+
+proxy server (13)
+Any kind of proxy, including web proxies and other servers that cache
+data or understand high-level protocols.
+
+remote managment (51)
+Devices that allow servers or other equipment to be monitored or managed
+remotely.
+
+router (310)
+Routers connect multiple networks. They are distinct from hubs and
+switches because they route packets between different networks as
+opposed to extending one network.
+
+security-misc (43)
+Any security device that doesn't fall into the "firewall" category
+belongs in this category. This includes intrusion detection and
+prevention systems.
+
+specialized (108)
+The catch-all category. If a device doesn't fall into one of the other
+categories, it is specialized. Examples in this category are diverse and
+include such things as clocks, oscilloscopes, climate sensors, and more.
+
+storage-misc (101)
+Data storage devices like tape decks and network-attached storage
+appliances.
+
+switch (274)
+A device that extends a network by selectively re-broadcasting packets.
+Switches are distinct from hubs, which broadcast all packets.
+
+telecom-misc (24)
+Devices used by telephone systems that aren't PBXs, like voicemail and
+ISDN systems.
+
+terminal (9)
+A device with a keyboard and monitor with the primary purpose of
+communicating directly with a terminal server or mainframe.
+
+terminal server (24)
+A device providing terminal facilities to clients over a network.
+
+VoIP adapter (52)
+A device that converts between voice over IP (VoIP) protocols and normal
+telephone traffic. Also may convert different VoIP protocols.
+
+VoIP phone (81)
+A phone capable of a VoIP protocol.
+
+WAP (298)
+Wireless access points offer a wireless connection to a network. Most
+work with radio technology like 802.11b but some use infra-red or
+something else. Devices that could also be put in another category, like
+wireless broadband routers, are put in the WAP category because WAPs
+require special network considerations.
+
+webcam (100)
+Any kind of camera that stores or transmits pictures or video. This
+includes everything from consumer webcams to security system cameras.
+
+----
+
+Proposed changes
+
+Move X-ray machine (2) to specialized.
+
+Move cluster (3) to specialized.
+
+Move projector (3) to media device. I didn't find any projectors miscategorized
+as "specialized" -David.
+
+Move encryption accelerator (6) to proxy server.
+
+Move web server (2) to general purpose or specialized.
+
+Put Ethernet-serial bridges in the "bridge" category.
+
+Put the http-proxy matches in nmap-service-probes into the "proxy
+server" category if they are from a dedicated proxy device. Some of them
+are "security-misc" currently.
+
+Merge VoIP gateway into VoIP adapter.