Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3504-ST found under Modem Fiber Optic by Synoptics Communications Inc. The National Stock Number assigned to this part is 6030014451191, 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 3504-ST.