2170 & 2171 Questions

Could I only connect the Tx fiber from 2170 to 2171? I need unidirectional connection between the computer and the storage device, because I need to use the USB flash memory as a read only device.
I have the USB over fiber 2170/2171 devices and I operate them with the external power supply S.I. Tech #2164 (12VDC). I would like to get your advice - I would like to operate it with other power supply of Lambda LUT series, that supplies 15VDC (regulated).