How to add 3G device to RB715U

RouterOS Beginner Basics
1

I'm just a beginner, please be kind. I am not new to Networking, but this product is something different to what I'm used to.

I have a supported 3G device, Sierra 312U. I plug it into the Routerboard, I can scan for GSM network, comes up fine.

I have been trying to set it up so I can talk to it and also implement it as a failover channel. I have been using RouterOS - RouterOS - MikroTik Documentation as the first step.

Unfortunately, I can't seem to attach it as a port, I get

[admin@MikroTik] /system routerboard usb> /system resource usb print

DEVICE VENDOR NAME SPEED

0 1:1 Linux 3.3.5 ehci_hcd RB400 EHCI 480 Mbps
1 1:3 Sierra Wireless, Inco... AirCard 312U 480 Mbps
[admin@MikroTik] /system routerboard usb> /port print Flags: I - inactive

NAME CHANNELS USED-BY BAUD-RATE

[admin@MikroTik] /system routerboard usb

What am I doing wrong?

Any info gratefully received.

Serge

2

Replying to self,

A savvy reseller advised me, it’s probably detecting an LTE device. How is an LTE device different from a 3G device at the interface level?

For the record, answer is

/port firmware set ignore-directip-modem=yes
/system reboot

Now to get failover to work..