Encyclopedia > Essential service

Article Content

Essential service

In telecommunication, an essential service is a network-provided service feature in which a priority dial tone is furnished.

Note 1: Essential service is typically provided to fewer than 10 % of network users.

Note 2: Essential service is recommended for use in conjunction with NS/EP telecommunications services. Synonym critical service.

Source: from Federal Standard 1037C

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

Quadratic formula

... side is now a perfect square; it is the square of (x + b/(2a)). The right side can be written as a single fraction; the common denominator is 4a2. W ...