Option Globetrotter HSDPA USB Modem
Document Revision 2009-04-21: RouterOS changes since V3.23
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
Router Hardware: MikroTik Router with USB port(s) (RB230, any x86 system, RB433UAH, or, RB411U)
Router Software: RouterOS V3.x (works in v2.9.x as well). Configuration is changed since V3.23.
USB Modem: Option N.V. Globetrotter HSDPA USB Modem H7.2
Manufacturer: Teltonika, model number U3G150
The USB Modem is recognized in RouterOS as an USB device and listed under the USB resources:
[admin@rb411u] > /system resource usb print # DEVICE VENDOR NAME SPEED 0 2:1 RB400 EHCI 480 Mbps 1 1:1 RB400 OHCI 12 Mbps 2 1:3 Option N.V. Globetrotter HSDPA... 12 Mbps [admin@rb411u] >
Make sure the USB port is listed under the port menu:
[admin@rb411u] > /port print Flags: I - inactive # NAME CHANNELS USED-BY BAUD-RATE 0 serial0 1 Serial Console auto 1 usb2 3 9600 [admin@rb411u] >
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:
[admin@rb411u] > /port set usb2 baud-rate=9600
Check the modem responses using serial-terminal, like this:
[admin@rb411u] > /system serial-terminal usb2 channel=2 [Ctrl-A is the prefix key] ATI Manufacturer: Option N.V. Model: GTM378 Revision: 2.3.3Hd (Date: Jul 17 2007, Time: 15:49:23) OK
Disconnect from the modem, by pressing "Ctrl-A", and then "Q":
[Q - quit connection] [B - send break] [A - send Ctrl-A prefix] [R - autoconfigure rate] Welcome back! [admin@rb411u] >
Router Configuration for PPP
Since RouterOS V4 (and latest versions 3) the PPP client configuration is made much easier comparing to how it was previously. A ppp-client interface is added automatically to the /interface ppp-client list:
[admin@rb411u] > /interface ppp-client
[admin@rb411u] /interface ppp-client> print
Flags: X - disabled, R - running
0 X name="ppp-out1" max-mtu=1500 max-mru=1500 mrru=disabled port=usb2
data-channel=2 info-channel=2 apn="internet" pin="" user="" password=""
profile=default phone="" dial-command="ATDT" modem-init=""
null-modem=no dial-on-demand=yes add-default-route=yes use-peer-dns=yes
allow=pap,chap,mschap1,mschap2
[admin@rb411u] /interface ppp-client> info 0
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:
[admin@rb411u] /interface ppp-client> set 0 dial-on-demand=no
[admin@rb411u] /interface ppp-client> enable 0
[admin@rb411u] /interface ppp-client> print
Flags: X - disabled, R - running
0 R name="ppp-out1" max-mtu=1500 max-mru=1500 mrru=disabled port=usb2
data-channel=2 info-channel=2 apn="internet" pin="" user="" password=""
profile=default phone="" dial-command="ATDT" modem-init=""
null-modem=no dial-on-demand=no add-default-route=yes use-peer-dns=yes
allow=pap,chap,mschap1,mschap2
[admin@rb411u] /interface ppp-client>
After enabling the interface watch the logs to see how the connection is being established over the USB modem:
[admin@rb411u] /interface ppp-client> /log print 12:29:16 async,ppp,info ppp-out1: initializing... 12:29:16 async,ppp,info ppp-out1: reseting link... 12:29:16 system,info device changed by admin 12:29:16 system,info dns changed 12:29:17 async,ppp,info ppp-out1: initializing modem... 12:29:17 async,ppp,info ppp-out1: dialing out... 12:29:17 async,ppp,info ppp-out1: authenticated 12:29:20 async,ppp,info ppp-out1: could not determine remote address, using 10.112.112.119 12:29:20 async,ppp,info ppp-out1: connected 12:29:20 system,info dns changed [admin@rb411u] /interface ppp-client>
The serial port is used by ppp client:
[admin@rb411u] > /port print Flags: I - inactive # NAME CHANNELS USED-BY BAUD-RATE 0 serial0 1 Serial Console auto 1 usb2 3 PPP <ppp-out1> 9600 [admin@rb411u] >
Check the addresses, in our case we have:
[admin@rb411u] > /ip address print Flags: X - disabled, I - invalid, D - dynamic # ADDRESS NETWORK BROADCAST INTERFACE 0 D 10.5.8.64/24 10.5.8.0 10.5.8.255 ether1 1 D 10.40.192.214/32 10.112.112.119 0.0.0.0 ppp-out1 [admin@rb411u] >
and routes:
[admin@rb411u] > /ip route print Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P - prohibit # DST-ADDRESS PREF-SRC GATEWAY DISTANCE 0 ADS 0.0.0.0/0 10.112.112.119 1 1 ADC 10.5.8.0/24 10.5.8.64 ether1 0 2 ADC 10.112.112.119/32 10.40.192.214 ppp-out1 0 [admin@rb411u] >
You may need to use masquerade to hide your private network when going out through the ppp.
You can get more status information about the modem and network, if you disable the ppp-client and run the "info" command:
[admin@rb411u] /interface ppp-client> info 0
failure: can't reuse channel while ppp-client running!
[admin@rb411u] /interface ppp-client> disable 0
[admin@rb411u] /interface ppp-client> info 0
status: "ready"
pin-status: "no password required"
functionality: "minimum"
gprs-class: "A - GPRS & GSM simultaneous"
manufacturer: "Option N.V."
model: "GTM378"
revision: "2.3.3Hd (Date: Jul 17 2007, Time: 15:49:23)"
serial-number: "356237010662581,S23977B51N"
current-operator: "LV LMT GSM"
access-technology: "3G"
signal-strengh: -89
[admin@rb411u] /interface ppp-client>
Troubleshooting
1. If you do not get "authenticated" and "connected", then there is something wrong with your settings. Most likely, the profile or the ppp-client interface settings should be changed to match your provider's requirements.
2. If the USB port settings are wrong, there would be log message when you try to run the ppp client:
00:08:50 async,ppp,info ppp-lmt: initializing... 00:08:50 async,ppp,info ppp-lmt: reseting link... 00:08:50 async,ppp,info ppp-lmt: reseting link... - could not acquire serial port 00:08:50 async,ppp,info ppp-lmt: disconnected
3. You can check if you can communicate with the USB modem by using the serial-terminal. Make sure the ppp-client is disabled! Start the serial terminal and run some AT commands:
[admin@rb411u] > /system serial-terminal usb2 channel=2 [Ctrl-A is the prefix key] AT OK AT+CSQ +CSQ: 14,99 OK
This must be okay, because the modem responds to your commands. Quit the serial terminal with "Ctrl-A" and "Q":
[Q - quit connection] [B - send break] [A - send Ctrl-A prefix] [R - autoconfigure rate] Welcome back! [admin@rb411u] >
4. Turn off PIN request for your SIM card, it makes the life much easier. Do it in a phone if you do not know the correct AT command.
5. When interface ppp-client info 0 returns OK in few section, wrong channel is used,
/interface ppp-client> info 0
pin-status: "READY"
manufacturer: "OK"
model: "OK"
revision: "OK"
serial-number: "OK"
activity-status: ""
functionality-status: ""
gprs-mode: ""
current-operator: ""
signal-level: ""
Change channels,
/interface ppp-client> set 0 command-channel=3 data-channel=3 info-channel=3
Unless /interface ppp-client info 0 returns,
/interface ppp-client> info 0
pin-status: "READY"
manufacturer: "Sierra Wireless, Inc."
model: "C885"
revision: "J1_0_1_6AP C:/WS/FW/J1_0_1_6AP/MSM7200A/SRC/AMSS 2008/07/09 07:52:58"
serial-number: "xxxxxxxxxxx"
activity-status: "ready"
functionality-status: "minimum"
gprs-mode: "A - HSDPA"
current-operator: "AT&T@"
signal-level: "-89 dBm"
6. If you need to add multiple inits (multiline inits) then it is possible by dividing them using ; character. Example:
modem-init="AT+CGDCONT=5,\"IP\",\"internet.lmt.l\";AT+CGDCONT=6,\"IP\",\"internet.lmt.lv\";AT"
Additional Resources
Huawei_EVDO WiKi Page with similar setup for a PCMCIA modem
Teltonika HomePage of the USB modem manufacturer