Multichannel queuing system with finite buffer and unreliable servers

Multichannel queuing system with a semimarkovian input flow, a phase type distribution of the servicing, a finite buffer and unreliable servers refusing independently one from other and regargless of the whole process of refusals and restorations is considered. Mathematical relations allowing calculation of the main stationary characteristics of system functioning are found under some different variants of the process of refusals and restorations.