Modem is the abbreviation for "Modulator/Demodulator", a device to translate digital signals for transport over analog lines, typically but not only phone lines.

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pcap file 20 times smaller than ifconfig TX/RX difference for same period

I run tcpdump on a usb modem in network card mode. [ 18.260000] cdc_ncm 1-1.1:1.1 wwan0: register 'cdc_ncm' at usb-ehci-platform-1.1, Mobile Broadband Network Device, 0c:5b:8f:27:9a:64 I run it ...
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USB 56k modem not detected

I have this USB 56k modem which I'm using to write some home automation software that will let me know when my home phone is ringing. My software works on my Ubuntu 14.04 LTS laptop, with my modem ...
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103 views

Huawei E3372s + Linux (Rasbian), Incoming connections problem

I have a Linux-based OS (Rasbian) running on Raspberry Pi 2+ and it is using Huawei E3372s 4G/LTE USB Stick for internet connection. All my outbound connections work perfectly (Huawei USB mode ...
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23 views

How to communicate with modem over Ethernet?

I have an old modem I was considering repurposing. The first step I thought to do was connect my computer with the modem and try to map the open ports. I found that, upon connecting the device, that ...
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66 views

4G modem on an embedded 2.6.32.9 kernel on a Parrot AR Drone 2.0

I am attempting to compile support for a Huawei E3276 usb LTE modem for an embedded Linux/BusyBox installation on a Parrot AR Drone 2.0, which is based on kernel 2.6.32; however, I am running into ...
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102 views

How to send AT commands to modem once the connection is established?

I have a zte 3g modem. I use carrier provided dialer for connection establishment. Once the ppp connection is active, i would like to send some AT commands(for ex. Query signal strength, AT+CSQ). But ...
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75 views

List serial devices on FreeBSD

On FreeBSD, I'm looking for a way to list serial communication devices. The computer has two of them installed: An on-board serial console (ttyS0), and an internal analog modem. I can find out about ...
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86 views

How do I ask NetworkManager/ModemManager to run a program before pppd?

The story is not so important for this question, but here it is: the GPRS modem is locked-in to the vendor's software (it doesn't work, if it doesn't receive a correct response to a "challenge" it ...
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88 views

ZTE MF190 modem wont install in linux mint

I have currently installed Linux Mint cinnamon 16.1. I tried to put in my ZTE MF190 modem. But the computer can't read any details of any driver. What can I do?
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277 views

What is the complementary command to 'rx' for xmodem transfer?

I have an installation of busybox on an embedded linux system that comes with a great little utility called rx: rx FILE Receive a file using the xmodem protocol This is perfect for transferring ...
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738 views

USB 3G/4G modem problem

I have LTE USB modem identified as ID 0408:ea16 Quanta. It doesn't have problem with my windows machine, but with my fedora (kernel 3.18.5-201) it is not working. I've found some info in the ...
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228 views

How to connect ZTE MF 823 Surf Stick in virtual Linux?

I have an LTE Surf Stick which I would like to get working inside my virtual machine. The Stick is called "ZTE MF 823". I am running openSUSE 13.1 with NetworkManager and I was not able to find any ...
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94 views

My Mobile Internet connection is disabled even though it is enabled

I don't know how to better formulate the question. I have enabled the Mobile Broadband, and the system correctly detects that I have a Vodafone CZ HSUPA connection available on the SIM card. However, ...
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114 views

Setting up ZTE E137 modem in Opensuse 13.2

how can i set up a ZTE E137 modem in my opensuse 13.2 installed in my workstation/pc. i have used a usb stick to install modem manager into opensuse 13.2 but logs for modem-manager read it cannot ...
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Modem is not being detected (Why I've to usb_modeswitch?)

I am using Trisquel 7.0 LTS and mobile broadband (Net-Setter) to establish connection. Following states (1-4) are showing different conditions/situations for clear understanding of problem. ...
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86 views

Use HUAWEI Gsm Modem in centos 5.01

I'm trying to develop an application that sends sms from my centos pc. And in order to accomplish this I am using HUAWEI Gsm modem. But I can't get to connect the modem to my virtual centos 5.01 ...
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How to enable second SIM slot in ALIX6F2 and how to switch 3G to it from the 1st one?

I am trying to enable the SIM slot under the RF card but with no success whatsoever. I'm using Voyage 0.8 (a stripped off Debian distribution) as an operating system. A bit of searching landed me to ...
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157 views

mgetty stopped working as dialin after opensuse upgrade

Background: OpenSuSE 11.4 worked well for a couple of years. mgetty was configured to listen to /dev/ttyS0 and work as dialin link. Updated system to OpenSuSE 12.1 > 12.2. > 12.3 > 13.1 and lost ...
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50 views

Switching from GSM to CDMA

NetworkManager has crashed and now it's showing CDMA mobile broadband as a GSM device. How I can switch to CDMA mode? I'm using Ubuntu.
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222 views

Gobi 2000 not detected on Lenovo X201

I recently bought a used Lenovo X201 wich includes a Gobi 2000 3G modem, but I can't get it working for the simple reason: the USB device does not appear to show up in the kernel. uname -r output: ...
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94 views

Simple telephone system to record kids' “calls”

My four year old daughter loves playing with an old POTS phone. She has these amazing conversations on it and I thought it would be nice to record them, and perhaps even let her pretend to make ...
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109 views

Serial port's modem lights up, but can't communicate

My MB has builtin UARTs (Supermicro X10SAE). I've got an external modem hooked up to /dev/ttyS0. I'm running CentOS7. Without minicom running on /dev/ttyS0: The modem has CTS on. With minicom ...
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413 views

4G hostless modem and rndis_host problem

I'm trying to connect 4G modem Quanta 1k6e to my wl500g router with OpenWRT BARRIER BREAKER (14.07-rc2, r41815), but I have a trouble. When I attach device in log happen: Thu Aug 14 21:58:06 2014 ...
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How to set WiFi password on modem - buffalo airstation g54

I borrowed a WiFi modem from a friend - Buffalo Airstation G54 . I don't know about installations procedure, I just would like set a password to use the wifi, since now it is a free connection. I ...
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158 views

Chat application for monitoring with scripts

I am looking for a chat application, which would have the ability to interact with a shell script. I need this for a home project. An example of the usage would be: A client sends a chat message to ...
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332 views

How configurable is MPTCP?

I work on embedded Linux devices that usually have hard wired Ethernet as well as cell modem connections. If I were to use MPTCP would it be possible to easily configure the system to use eth0 all ...
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272 views

BSNL 3G USB modem not connecting

I am using Arch linux (fully updated). I have been trying to get my BSNL 3G usb modem to work to no avail for the past couple of hours. I have already installed modeswitch, wvdial, modem manager, ...
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1k views

Which TCP congestion control algorithm is best for low speed radio modems?

On my project we have remote Linux nodes that communicate over the Internet via very low speed CDMA cell modems. The bandwidth on these modems is about 2kbyte/second and the RTT back to the server is ...
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166 views

Send Fax with GSM modem on hylafax?

I have a couple of questions related to using a GSM modem for faxing. I wanted to know if it's possible to send faxes with the hylafax-server from a GSM modem? If possible can you please explain how ...
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139 views

How to handle DHCP on two network interfaces, one clobbers the other's /etc/resolv.conf

I have an embedded Debian Linux system. It has two network interfaces, eth0 and ppp0 via a cell modem. The problem I have is that when the system boots up it gets an address via DHCP on eth0. If ...
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669 views

How to get address of connected USB modem?

I just connected my N81 telephone as USB modem to Linux Mint 14. All works fine, just wondering how to find a full path to this device, something like /dev/tty*.
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How can I tell if PPP compression is enabled for modem?

I'm using Debian Linux on an embedded system, we use ppp to connect to the WAN via a CDMA modem. I want to find out if compression is being used by ppp. In my /var/log/messages I see the line: ...
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489 views

High RX packet error count with modem - how to analyze?

I'm testing a CDMA modem on my Debian embedded Linux system. I'm doing some wgets of large files and am seeing the connection drop now and then. Looking at the ifconfig output for the PPP interface ...
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5k views

Linux PPP : how to debug disconnects with exit code = 16?

I'm using pppd and wvdial on my ARM Linux embedded system. I have a CDMA modem connected via a serial port and am connecting to the Verizon network. I am seeing that several times per day pppd exits ...
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570 views

configure gsm connection using nmcli

I have a system without X display and I want to use nmcli to configure my cell modem to connect to a certain apn. I can get it going with this modem just fine on Ubuntu (with X) and I would like to ...
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How to send a file using xmodem protocol from the command line

Want to shell script this and my scripting skills are rather limited so please bear with me. Have scope attached to RX and TX lines of the serial port. If I do: cat /dev/ttyS0 Get a steady stream ...
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1answer
424 views

Determine 2G or 3G connection

I am using WvDial to dial my USB modem up to my ISP. But how can I tell what network I am connected to: 2G or 3G?
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Troubles establishing connection with wvdial

I have a Huawei cell modem EM680 with which I can establish a connection on my Ubuntu 13.10 box just fine. I plug it in and I can establish a connection using the Connections Manager. I have a box ...
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197 views

what is the relationship between wvdial, pon and chat?

I've checked their man pages, but I'm still confused. I just know they are all related to ppp connections... I'm surprised that when I googled "pon wvdial relationship", I get no useful results, so I ...
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getting “bad init string” when dialing with wvdial

I'm trying to dial-up with my Huawei modem EM680 using wvdial. My modem is found properly on /dev/ttyUSB1 but when I execute wvdial I get this: # wvdial --> WvDial: Internet dialer version 1.61 ...
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652 views

Error while trying to connect to internet using wvdial

I am getting error while connecting to Internet through Wvdial . This is the output which I am getting : tusharmakkar08@tusharmakkar08-Satellite-C660 ~ $ sudo wvdial --> WvDial: Internet dialer ...
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17k views

How to send AT commands to a modem in Linux?

In Linux (Ubuntu) I am trying to send AT commands to a modem at /dev/ttyACM0. I tried to do it as: sudo socat - /dev/ttyACM0 but when typing anything I just get a line repeating this command (I ...
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103 views

How to set up FAX modem card on OpenBSD?

I found a modem card in a dumpster yesterday. It's a Conexant RD01-D270 also marketed as "Dell / Conexant N11846 Modem Card". It still works, I've tested this on Linux, but I'd like to use it in my ...
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Unable to use ztemf 190A from Aircel in Linux Mint 13

I have installed Linux Lint 13 Mate 32 bit edition. I am not able to use my zte mf 190a 3g datacard given by Aircel as there is no driver for this. I do not know anything about Linux. Modem is shown ...
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558 views

Qualcomm based modem Venus converted to ttyUSB0 but not responding forever on fedora 18

I've one usb modem qualcomm based, here is my configuration what I've done in the past. wvdial # wvdial phone --> WvDial: Internet dialer version 1.61 --> Cannot get information for serial ...
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5k views

D-Link DWM-156 HSPA USB Modem doesn't work with SIM card inserted

I have a D-Link DWM-156 HSPA modem, that I bought just a few days ago. The modem has drivers in its internal storage. There are Debian packages (.deb) for both i386 and amd64, so obviously I installed ...
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Unable to connect INTEX 3.5G (aka 普创E003) Wireless USB modem in Ubuntu 12.04 LTS

Can anyone help me out on connecting INTEX 3.5G 7.2 Mbps (aka 普创E003) Wireless USB modem in Ubuntu? Initially it is recognized as a storage device and the modprobe cmd does not create any impact on ...
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How to install precompiled ath9k driver?

I have a Ubuntu and I have cross compiled an ath9k driver for an ARM architecture. The problem is a can't make the install work as I want to work. README says the following: Building for external ...
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309 views

Huawei modem change auto answer settings

Is there a way to change Huawei modem ATS0=1 command to be permanently set, so that there would not be need to send that command every time when modem is plugged in ? On each modem-plugin command is ...
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4k views

Fixed udev rules for USB modems

On gentoo i have 10 USB modems and every of them has 3 interfaces /dev/ttyUSB0, 1, 2 and so on for each modem. Sometimes their postitions can change, so it is very difficult to work with them. I'm ...