{TAIL ~ An input/output port} allows {HEAD ~ encrypted/unencrypted data} to be input to/output from the BCU 
{ TAIL ~ An input / output port } allows { HEAD ~ encrypted / unencrypted data } to be input to / output from the BCU
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH