basic units

Symbol: basic units - chokechoke
Symbol: basic units - power supplypower supply
Symbol: basic units - power supply + chokepower supply + choke
Symbol: basic units - connectorconnector
Symbol: basic units - backbone couplerbackbone coupler
Symbol: basic units - line couplerline coupler
Symbol: basic units - bus access unitbus access unit
Symbol: basic units - logic modulelogic module
Symbol: basic units - line amplifierline amplifier