The probability that a call will not be connected to a system because all trunks are busy. Grade of service is often expressed as "p.01" meaning 1% of calls will be "blocked." Sometimes, grade of service is used interchangeably with service level, but the two terms have different meanings. See Service Level.
Found on
http://www.confero.co.uk/glossary.htm
the value of a traffic engineering quantity used to provide a measure of adequacy of a group of resources to carry traffic under specified conditions NOTE - This may be a proportion of time-out overlays, probability of loss, dial-tone delay, etc.
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=715-07-13
Measure of telephone service quality based on the probability that a call will encounter a busy signal during the busier hours of the day.
Found on
https://www.encyclo.co.uk/local/22803
No exact match found.
