This disclosure describes techniques for using a non-volatile-memory device such as flash memory to store memory data during hibernation or suspend. This makes it impossible to increase the printing speed. Shimming is then performed according to the calculated results. The socio-RBT subscription information comprises at least one unique identifier of the user. The circuit asserts a third digital logic signal when the circuit determines that the terminal is floating or substantially floating. Each virtual channel is allocated a minimum number of credits and the remaining credits of the ISL are held in a common pool.