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Document Revision 2009-10-28: RouterOS changes since V4.2

Your modem (an Option Globetrotter Express or GT), like most EDGE/3G(+) USB modems is natively supported by MacOS X, and as such will appear as a new network connection the first time you plug it in. You can then configure it like you would any other network port; in particular simultaneously connect to another network like the poster wants to. Free Modem Drivers downloads for Windows, Mac, and Mobile from ZDNet. This package supports the following driver models:GlobeTrotter Module 3G+ Flip-Flop Bus. Price: USD 0: License: Free: File Size: 25.42 MB: Version: 2006-08-03: Operating System: Windows 95 Windows 2000 Windows XP AMD 64-bit Windows 98 Windows Windows XP Windows NT Windows 2003 AMD 64-bit Windows 2003. Drivers: WindowsTM2000 Pro, Personal and XP Pro / Home, Vista and MAC OS X. A PCSC compatible driver, compliant with ISO 7816 and 3GPP TS11.11. SIM-ME interface as specified in 3GPP GSM TS11.11 and GSM 11.12 and in compliance with ISO 7816. SIM Application toolkit capable SIM to 3GPP GSM TS11.14.

7Troubleshooting

Introduction

This example shows how to get the Option Globetrotter HSDPA USB Modem working with LMT (Latvian Mobile Telephone UMTS/GPRS networks), or with Amigo (GPRS network) in Latvia. Service in your country might have different requirements and strings, but this is just to give you an outline of what is required.

Hardware

USB Modem: Option N.V. Globetrotter HSDPA USB Modem H7.2

Modem manufacturer: Teltonika, model number U3G150

Router Hardware: MikroTik Router with USB port(s)(RB230, any x86 system, RB433UAH, or, RB411U)

Router Software

RouterOS V4.2. Works in previous versions 2.9 and 3, but slightly different configuration.

The USB Modem is recognized in RouterOS as an USB device and listed under the USB resources:

Make sure the USB port is listed under the port menu:

Prior RouterOS V3.23, a modem had all its ports listed. Since V3.23 there is one port per modem, and modem has channels used for commands and data. Channels have numbers 0,1,2, etc. Some modems may have just two channels, some have more. Set the baud rate to 9600 for communicating with the modem, in case it's not done already:

Check the modem responses using serial-terminal, like this:

Disconnect from the modem, by pressing 'Ctrl-A', and then 'Q':

Setting AT command as 'user-command' value can be useful for sending it from RouterOS scripts. Delay is required between RouterOS commands to send AT commands sequentially:

Workaround for Globetrotter devices offering no modem interface

There is no guarantee that the commands above work on all the modems that need the HSO driver. The tested device was a T-Mobile branded Globetrotter iCON 225 'web'n'walk Stick'. That device was able to connect without problems after the method described. Some Globetrotter HSDPA cards, for example the iCON 225 (branded as Orange, T-Mobile web'n'walk stick, etc. have the serial modem interface disabled by default, and only offer an NDIS network interface for the data connection. If a dial command is issued, but no CONNECT response happens from the modem, it might be helpful to check this. To check on the setting, issue:

In this example, the MDM (modem) interface is set to 2, so no serial modem interface is enabled in the device.

To change the setting, issue:

You should get: OK

To write the change permanently to the NVRAM of the device, issue:

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Unplug and re-plug the device, and issue:

Number of channels should have increased. On the tested device, the last channel is the modem-interface (number 3 in RouterOS).

According to [1] the Linux HSO driver page at least five Option devices exist which do not have the modem interface enabled by default.

Router Configuration for PPP

Since RouterOS V4 (and latest versions 3) the PPP client configuration is made much easier compared to previous versions. There is no need to use ppp profiles, and ppp-client interface might have been added automatically to the /interface ppp-client list:

The interface has 3G/GPRS modem specific arguments, like apn, pin. Consult your network provider what to use for APN, user, and password. Adjust your peer-dns and default-route settings according to what you want to do over that interface! In our case, we want permanent connection and won't use dial on demand:

After enabling the interface watch the logs to see how the connection is being established over the USB modem:

The serial port is used by ppp client:

Check the addresses, in our case we have:

and routes:

You can get more status information about the modem and network by running the 'info' command. In our case the modem uses the same channel for data and info, thus, we disable the ppp-client and run the 'info' command then:

You may need to use masquerade to hide your private network when going out through the ppp!

Modem Preferred Operation Settings

OPTION modems can be set for preferred operation in UMTS(3G) or GPRS networks. To change the operation mode, use AT_OPSYS command via terminal, or, include it into the modem init string:

Query the current _OPSYS setting using the AT_OPSYS? command:

The _OPSYS operation mode setting stays intact after router reboot or power off/on. If you lock the modem operation setting to 3G only, the scan command won't show GPRS networks, and vice versa.