Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 19643-01 found under Modem Fiber Optic by Versitron Inc. The National Stock Number assigned to this part is 6030013870451, and the Federal Supply Class is 6030 Fiber Optic Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 19643-01.