HP 200 Series Services And Applications page 168

DECnet Routing Service
DECnet Services
DECnet Services
The following are among the services available on a DECnet internetwork
through HP routers:
Virtual Terminal Service: allows a remote terminal to access a host
system. (Also known as CTERM, control terminal module).
Data Access Protocol (DAP): is a presentation-layer protocol suite
that provides functions for exchanging data between two nodes on a
network.
Record Management Service: is a common I/O interface for VMS
used for accessing data from a remote node. It uses DAP services.
Network File Transfer (NFT): is an interactive utility providing
access to remote data. It uses DAP services.
Distributed Naming Service (DNS): is a directory service that
separates the logical name of an entity from its physical location.
Distributed File System (DFS): allows a remote file to appear to the
user as though it were local.
Distributed Queuing Service: provides access to remote printers.
Videotex is an interactive system that allows subscribers to down-
load several pages of information to a local terminal or node.
General Addressing Considerations
DECnet Phase IV uses a hierarchical addressing scheme. DECnet internet-
works can be logically divided into distinct, non-overlapping areas. An area
can be a single LAN or several LANs and WANs interconnected through
routers. A DECnet internetwork can be divided into as many as 63 areas. An
area can have as many as 1023 nodes (routers and end nodes). End nodes
within an area reside only on the LANs. Routers connect both LANs and
WANs and may connect to routers in other areas. Note that for performance
reasons, all nodes on a LAN must be
in the same area.
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