Hello,

today I bought new RB751U-2HnD. I shortly tested it in my simple home network and works perfectly.
The main purpose for this device is to route 3G/CDMA connection to my network as a primary uplink.

I borrowed Huawei E1750 with Vodafone CZ SIM card and it works without any problems - just needed to set up PPP and enable srcnat.

I own Vodafone Combo modem "CELOT CTD-200 Dual USB Modem" and I want to use its CDMA part as an uplink for my net. But I don't know how to force RB recogize this modem as a modem - it doesn't show as a "port" in Ports section of Winbox/Webfig.

What i tried:
- upgrade RouterOS 5.21 to 6.0rc11 (no effect)
- connected the CELOT modem to linux x86 machine - modem need usb-modeswitch stuff to became two serial ports instead of virtual CD-ROM drive
- when I tried to connect via this modem in Ubuntu, after modeswitch I needed to reload "usbserial" module with forced vendor/device IDs

I wonder about usb-modeswitch functionality in RouterOS, but I think I don't really need it, because in System->Resources->USB are already two devices - CDMA part of modem, vendor:0x211f device:0x6805 and WCDMA (3G) part, vendor:0x211F device:0x6809.

So I think that the solution would be to force vendor/device ID to usb-serial driver(module?) in RouterOS - is this possible to do?

If it's not possible to do this - is an option to get vendor/device IDs of this modem to next version of RouterOS so it can be recognized as a modem automatically? It should be possible because some CELOT modems are already supported.

I don't have any information about required firmware files for this modem.

I can send supout.rif on request, or reply to any question related to this problem. Unfortunately I don't have public IP so I can't make access to my RB.

Thanks everyone in advance.

EDIT: usb-modeswitch clearly not needed in RouterOS, because "CD-ROM emulation" layer of modem has vendor/device IDs 05c6:1000, which is common ID for this "virtual" CD-ROM device. I couldn't see this ID in Winbox/Webfig, so RouterOS has already done usb-modeswitch operation. Now the only needed thing is to get the ports recognized. If needed, I can supply USB sniffer logs from Windows workstation with this modem.

Write email to MikroTik support, at the moment only MT is able to add support for new device to ROS.

HTH,