Number of Circuits to Be Provided in Automatic and/or Semiautomatic Operation, Without Overflow Facilities - Telephone Network and ISDN - Quality of Service, Network Management and Traffic Engineering (Study Group II) 3 pp
The CCITT recommends that the number of circuits needed for a group should be read from tables or
curves based on the classical Erlang B formula (see Supplements Nos. 1 and 2 at the end of this fascicle which refers to full availability groups). Recommen