not shown that allow for manual configuration setup as well as for initiating and monitoring off line and diagnostic utilities the enclosure management interface 920 fig9 a monitors power supplies cooling fans a door interlock and controls enclosure led indicators the power interface 990 provides a connector for input dc power for the vtc electronics and the enclosure leds as shown in fig9 a b the vtc 400 embodiments also have a digital signal processor dsp 950 microprocessor random access memory ram 952 programmable read only memory prom 954 non volatile random access memory nvram 956 microprocessor data bus 930 data path command logic 932 and data path control logic 1000 the prom 954 contains the vtc firmware as read only dsp instructions described with respect to fig1 a b below the ram 952 contains program parameters and variables in one embodiment the prom 954 is an eeprom and updated firmware can be downloaded into the prom 954 from the server channel 150 the nvram 956 contains vtc configuration and status information the microprocessor data bus 930 is also used to send a data path command 932 service the operator console and enclosure management interface and control the associated ram 952 prom 954 and nvram 956 the dsp 950 utilizes the microprocessor data bus 930 to program the channel interfaces 940 to send a command and receive the status of the command from the storage media 460 fig4 the data path command 932 instructs the data path control logic 1000 to program the data routing to and from the storage devices to transfer the command and associated data over the data path 970 as shown in fig9 a in one vtc embodiment 400 the device.