DECnet Protocols

DECnet Phase IV supports several proprietary protocols, including those shown below (this is not a complete list):

• DAP Data access protocol—provides remote file access.

• LAT Local area transport—provides multiplexed terminal traffic (can carry combined traffic to and from multiple terminals, such as with terminals attached to a terminal server).

• CTERM Command terminal—a terminal emulation protocol.

• LAVC Local area VAXcluster (VMScluster)—carries VMScluster traffic among cluster members.

• SCP Session control protocol—manages logical network links.

• NSP Network service protocol—provides reliable virtual connections on top of the routing protocol.

• MOP Maintenance operations protocol—provides utility functions, such as downline-loading of operating system software and network testing.

• RP Routing protocol—provides routing information to DECnet nodes.

DECnet OSI supports, in addition to many of the proprietary Phase IV protocols, all standard OSI application-layer, presentation-layer, and session-layer implementations.

Both DECnet Phase IV and DECnet OSI support popular media-access implementations, such as Ethernet (IEEE 802.3), Token Ring (IEEE 802.5), and FDDI. Data-link-layer support includes IEEE 802.2 LLC (logical link control), LAPB (link access procedure, balanced), Frame Relay, and HDLC (high-level data-link control).