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Appendix D Glossary
PocketPro 100S Administrator’s Guide -- Document #40165-110 Rev. A D-13
OS/400
The operating system used on IBM AS/400 minicomputers.
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 that 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. 1-2, 2-15.
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.
PATHWORKS
The Digital Equipment Corporation network operating system for PCs and Macintosh computers.