I have faced some strange problem with the modem. At the beginning I configured SL8090 under linux using pppd and
it worked ok (at least 4 usb_serial devs were seen). Lately I have noticed that my modem is showing only one - ttyUSB0.
it means that bNumInterfaces = 1. At this point I do not really know where the problem can occur and why is there only one
usb_serial device ? I do not have a chance to check the modem under different system or try different modem because it is placed on the custom board.
Does anyone know how the modem works when W_DISBALE line is active? How many interfaces is given in such situation?