CFTGContext-Free Tree Grammar (computer science)
CFTGCircuit Facility Trunk Group
CFTGClient Focus Technology Group
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The expert system can be used for a differential evaluation of two routing patterns, one with head-end hop off as a CFTG, the other with tail-end hop off replacing it.
It must also generate combinations of such facilities--these are the user subnetworks or circuit facility trunk groups (CFTGs).
This optimization is performed by a design cycle that consists of three basic steps: selection of vendors, of vendor combinations and of user-defined subnetworks (this involves selection of the traffic destination groups and of the CFTGs), evaluation of the cost and grade of service of the circuit facility trunk groups at a PBX, and optimization (use of mathematical programming techniques to modify the routing and to adjust the trunk-group sizes).