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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5answers
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Is there a way for linux to pick up the phone?

I know that there is a way to make Linux dial out using a modem. Is there a way to program Linux (using a library/device) to pick up the modem (record phone calls) etc? see caller id?
7
votes
2answers
2k views

Find out what /dev/cuaU maps to?

I have an USB 3G modem (Huawei E353-u2) on pfSense 2.0.2 (which is based on FreeBSD 8.1-RELEASE-p13), it seems to create 2 /dev/cuaU devices: /dev/cuaU0.0 /dev/cuaU0.3 1) Why are there 2 devices? ...
6
votes
3answers
1k views

Detection of USB Modem is unstable - how can I correct this? [closed]

I am using Huawei 3G USB Modem in Ubuntu 12.04 LTS on DELL Inspiron NS5520. I tried every possible solution but had no luck. Whenever my USB Modem disconnects, I can not re-connect it and then I have ...
5
votes
3answers
2k views

Linux-compatible 56k modem

I have a client who wants to set up a fax server in their office. I'd like to use HylaFAX under Ubuntu, but I'm a little shy to spend money on hardware for Linux, particularly a modem given the whole ...
4
votes
3answers
3k views

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. ...
4
votes
1answer
8k 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 ...
4
votes
3answers
14k views

GSM modem does not create /dev/ttyUSB file

I installed Kannel in a server, and I want to use a GSM 3G USB modem to send/receive SMS messages, as described in section SMS Centers > GSM Modem of the Kannel User Guide. I have already installed, ...
4
votes
1answer
219 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 ...
4
votes
1answer
232 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 ...
4
votes
1answer
2k 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*.
3
votes
2answers
2k views

Does Linux have support for network interfaces over an AT-Command serial modem?

I've got a Telit GM862-GPS module, which is a GPRS modem with a serial interface and uses the standard Hayes AT command set (with some extensions). What I'd like to do is to be able to connect this up ...
3
votes
1answer
939 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 ...
3
votes
3answers
28k 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 ...
3
votes
1answer
417 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 ...
3
votes
2answers
2k views

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 ...
3
votes
1answer
618 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?
3
votes
1answer
4k views

USB 3G Modem for embedded Linux?

I am fairly new to Linux world, I have to develop an application on embedded Linux which sends data over internet. I have to choose a USB 3G modem with a SIM card holder. I would appreciate if anyone ...
3
votes
1answer
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 ...
3
votes
1answer
5k 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 ...
3
votes
2answers
3k views

Udev Rule file for Modem not working

I am using modem for sending sms which has 16 ( ttyUSB0 to ttyUSB15 ) ports. I want to make udev rule to give device name "AMPM" and ports should be name Port1, Port2,...Port16. Check out this output ...
3
votes
1answer
266 views

Can I set up linux to accept a dial up connection from my old windows95 laptop?

I've got a really old laptop running Windows 95, and I'd like to be able to connect it to my home network. It doesn't have an ethernet jack, nor a usb port. It does have an internal dial up modem ...
3
votes
0answers
19 views

Is there a way to tell wvdial to wait for the answer of a command?

Some AT commands in wvdial return their answers with a delay. This period of time depends on the command. For instance, when you want to scan for available networks, you can use the AT+COPS=? command. ...
3
votes
1answer
142 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 ...
3
votes
0answers
1k views

Making voice calls using Huawei E1550

3G dongle Huawei E1550 is able to make voice calls using huawei app in windows. With search I found the same app for linux (called Mobile Partner), seems it's working and makes calls but without sound ...
2
votes
2answers
2k views

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: ...
2
votes
1answer
302 views

IP address assigned when using 3G USB modem

If I use a 3G USB modem with a SIM card on my linux machine, do I get the IP address assigned by the carrier just as my phone when it uses the same SIM card, or do I get a different IP address (as it ...
2
votes
2answers
2k 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 ...
2
votes
2answers
967 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 ...
2
votes
1answer
311 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 ...
2
votes
3answers
5k views

Endless data loop from dev/ttyUSB while sending AT commands

I have problem sending AT commands to my USB modem. At first I tried php-serial class, but when i was reading data, I got endless loop with strange data. Then I tried to debug problem and opened putty ...
2
votes
1answer
3k views

Make USB modem work on Puppy Linux 5.28

I have an Alcatel Modem, when I plug it on my old dell c600 with Puppy Linux. This is the log from my Puppy Linux 5.28 on my dell laptop: tail -f /var/log/messages | grep usb user.err kernel:usb ...
2
votes
0answers
600 views

Could not resolve host: mirrorlist.centos.org

I did a fresh install of CentOS 7 on an Acer Inspire T. It is a terminal-only installation (no GUI). I connected the CentOS 7 box to a cable modem via an ethernet cable, and the cable modem is ...
2
votes
0answers
61 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.
2
votes
0answers
233 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 ...
2
votes
0answers
1k views

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 ...
2
votes
0answers
804 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 ...
2
votes
1answer
943 views

Cannot connect with 3g modem during Arch installation [closed]

I was trying to install Arch Linux with 3g modem. I had previously downloaded usb_modswitch and wvdial and their dependencies. I booted Arch and installed them. Then I copied my Ubuntu's ...
2
votes
0answers
245 views

Does HylaFax server run in OS X?

From their FAQ: HylaFAX is intended to run on any UNIX system that supports a particular set of features: FIFO special files, BSD-style sockets and the TCP/IP communication protocols, BSD-style ...
1
vote
1answer
1k views

Reserve Ports for modem

I have a modem with 16 ports using for sending SMS. When it's connected to my Linux machine, I get 16 ports from ttyUSB0 to ttyUSB15. Currently if I remove this modem and attached another it,I get it ...
1
vote
1answer
292 views

How can I know which serial port corresponds to a PCI card?

I have a vehicle computer with a internal 3G PCIe card for cellular communications, but I can't figure out which serial port I have to use in order to send AT commands. This computer also includes a ...
1
vote
1answer
494 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 ...
1
vote
1answer
639 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 ...
1
vote
2answers
686 views

Autodetect modem in Linux?

Is there a way to autodetect modem devices in Linux and then symlink them to /dev/modem using a udev rule? Currently, I wrote a program that probes each serial port, sending AT and waiting for OK. I ...
1
vote
1answer
31 views

Sending command to an already mounted modem

I'm working on a IMX6 based board, and I need some advice to handle my modem. I've successfully configure the modem, and mounted the ppp. The modem is working fine and everything's great, but now I ...
1
vote
1answer
678 views

Can I get an 8-bit clean connection with 'socat'?

This question is mostly about "socat", but here's some background to go with it: I am trying -- for reasons having mostly to do with nostalgia -- to write a virtual modem driver for use with ...
1
vote
0answers
20 views

Why the connection speed is limited to 20-30 mbit/s in the case of a PPP daemon?

I'm configuring my LTE modem (Huawei E3372s-153, NON-HiLink), and I recently found out that this modem can work in two different modes: RAS and NDIS (NCM). The second one works just as normal NIC and ...
1
vote
0answers
355 views

“Couldn't find support for device at '/sys/devices/pci0000:00/0000:00:14.0/usb2': not supported by any plugin”

I just bought a new laptop: "HP EliteBook 840 G2". I used this computer during my travel in a train. I buy this laptop because, It have a 4G modem integrated. This module work on Windows but I can't ...
1
vote
1answer
44 views

Using shared serial modem

I'm trying to use on Solaris box modem connected to Linux box via serial port. Sharing is made from socat. Server command(linux): socat tcp-l:54321,reuseaddr,fork ...
1
vote
0answers
98 views

socat for sharing serial port from linux to solaris

I'm trying to share serial port from linux box to solaris 10 box (solaris machine don't have serial port). While doing the same commands from linux box (modem-server) to other linux box - everything ...
1
vote
0answers
78 views

Trying to get a usb modem to run with wvdial

$ sudo wvdialconf Editing `/etc/wvdial.conf'. Scanning your serial ports for a modem. ttyS0<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next try: 9600 baud ttyS0<*1>: ...