upper bound

An upper bound of two elements x and y under some relation <= is an element z such that x <= z and y <= z.

("<=" is written in LaTeX as \sqsubseteq).

See also least upper bound.

Last updated: 1995-02-15

Upper Layer Protocol

<protocol>

1. (ULP, or upper-layer protocol) Any protocol residing in OSI layers five or above.

The Internet protocol suite includes many upper layer protocols representing a wide variety of applications e.g. FTP, NFS, RPC, and SMTP. These and other network applications use the services of TCP/IP and other lower layer protocols to provide users with basic network services.

2. A protocol higher in the OSI reference model than the current reference point. Upper Layer Protocol is often used to refer to the next-highest protocol in a particular protocol stack.

Last updated: 1999-02-17

upper memory block

<storage>

(UMB) Up to 64 kilobytes of the expanded memory page frame above the first 64 kilobytes. The UMB can be used to store TSR programs or device drivers thereby freeing parts of the precious conventional memory. The UMB is provided by special memory manager programs; many EMMs can provide UMB as well.

Last updated: 1996-01-10

Upper Side-Band modulation

<communications>

(USB) A kind of modulation applied to a sinusoidal carrier.

[Details?]

Last updated: 1997-07-16

Nearby terms:

UPMAIL Tricia Prolog ♦ upper bound ♦ Upper Layer Protocol ♦ upper memory block

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