The supported connection solutions differ depending on the printer that you are applying. Make reference to the "e-Manual" supplied using your printer for information regarding the supported relationship techniques. The USB-A connector is rectangular and connects towards your Pc. The USB-B connector is more square and connects to your printer. https://canon-printer-download38104.elbloglibre.com/37907368/the-2-minute-rule-for-printer-canon-g3020