Model of the channel with the packaged errors

The channel can be in two conditions: good and bad. good - no errors. bad - errors probable

As a part of package Simulink there is a communication channel model «Binary Symmetric Channel». There are random errors in this model.
However errors normally are packages in real channels of communication and I have developed such model of a channel. I hope that my model will successfully complement a section Simulink \Communication Blockset \Channels \.