In ISDN applications, a telecommunications service that establishes a communication path at a preset time (requested by the user) in response to a user-network signaling request.

A reserved code is an NXX code that has been temporarily set aside while the applicant awaits a decision from the appropriate regulatory authority on a safety valve waiver already submitted.

Reserved numbers are numbers that are held by service providers at the request of specific end users or customers for their future use. Numbers held for specific end users or customers for more than 180 calendar days shall not be classified as reserved numbers (FCC 00-429 §5
2. 15 (f)(1) (vi)).

In programming languages, a keyword whose definition is fixed by the programming language and which cannot be changed by the user.
Note: In Ada® and COBOL all keywords are reserved words, while Fortran has no reserved words.

The parameters initially programmed for basic operation.

A measure of the ability to duplicate controllable conditions.
Note: An example of resettability is the ability to reset the frequency controls of radio equipment.

Pertaining to computer programs that remain on a particular storage device.

Terminates the Access network and the VDSLx or ADSLx network. Also, in most telco implementations includes a router, NAT function, and Network Management functions for both the WAN and the LAN.

Synonym undetected error ratio.

1. The ratio of (a) the number of bits, unit elements, characters, or blocks incorrectly received but undetected or uncorrected by the error-control equipment to (b) the total number of bits, unit elements, characters or blocks.
2. The error ratio that remains after attempts at correction are made.