Thank you for your help.
I used the extra CAT5 cable I had, but it didn't work.
I think USB and PC are connected normally, but JTV and USB are not connected normally.
Perhaps for that reason, the red LED seems to be blinking on the [VARIXA IN] part.
I wonder if this is a problem with USB interface or JTV 59 itself.
If the USB interface is not working well, this may not be a big problem for me, but if this is a problem with JTV59, my JTV will have to go on a long trip this winter....