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Glossary and Index D-11
OSF/1 DEC's version of UNIX that was originally called ULTRIX and is
now called Digital UNIX. OSF/1 uses the standard Berkeley lpr/lpd
procedures for printing to remote host computers and print servers.
OSI Reference Model A seven-layer model developed by the
International Standards Organization which is used as a reference for
developing protocols. Since each layer performs a different function,
development and debugging are simplified, and there is greater flexibility
(for example, this approach allows TCP/IP to run over both Ethernet and
Token Ring).
P1284 An IEEE standard that defines a high-speed bidirectional parallel
printer port. P1284 ports are also compatible with the Centronics standard.
There are three types of physical connectors associated with the 1284
standard: 1284A (25-pin DB25), 1284B (36-pin standard Centronics), and
1284C (miniature Centronics). pp. 1-3, 1-6, , 2-20.
Packet A group of data and control information that is sent over a
network. Often used interchangeably with frame, although frame is
normally used with lower-layer protocols like Ethernet, while packet is
associated with higher layer protocols like IP and IPX.
Page Description Language A control language usually consisting of
commands embedded within a document that control the way the document
will look when printed. Such commands would set the type of fonts, page
margins, colors, graphics, etc. within the document.
Parallel Port On a printer, a port that transfers data 8 bits at a time for
maximum performance. The parallel port usually has a 36-pin Centronics
connector. p. 1-3 through 1-6, 2-7, 2-8, 1-19, 2-20, A-4, A-5.
PATHWORKS The Digital Equipment Corporation network operating
system for PCs and Macintosh computers. pp. 1-2; 11-6 to 11-9, 14-20, 14-
21, 14-22.
PCL A page description language originally developed by Hewlett-
Packard for its LaserJet printers.
PCONSOLE A NetWare utility program for configuring and managing
printers. pp. 5-16 through 5-17; 5-22 through 5-24.
PDL An abbreviation for Page Description Language.