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Questions tagged [modem]

145 questions
21
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5 answers

What's the difference between a switch, a router, and a modem?

What's the difference between a switch, a router, and a modem?
username
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9
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7 answers

Can Linux function as its own ADSL modem?

I'm not sure specifically the differences between a normal Dial-up modem and an ADSL one. Here is my problem: I recently found an old box in the basement, which I installed Ubuntu (linux) on. I have both a NIC, and an old dial-up modem on it. My…
Ben
8
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6 answers

Ubuntu failover from Ethernet-to-ADSL-modem to USB 3G dongle

I have an internet connected Ubuntu server, connected by Ethernet to a residential ADSL line. This is adequate, most of the time, but I can't rely upon the ADSL link to be as reliable as I'd like. Murphy's law has already dictated that down-time…
aSteve
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8
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3 answers

Connecting to an analog dial-in PSTN terminal without a PSTN line

there's a computer ("server") that has no Internet connection, and it is located in a place with no GSM signal. The only way to get connection to it is an analog modem (US Robotics 56Kbit/s). This modem is connected to a national PSTN line with a…
Giovanni Bajo
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8 answers

How can I simulate a modem over a VOIP connection?

I have a hardware device I need a server to dial into at regular intervals. The problem is I no longer have a POTS line or a modem in any of development computers, and all my production servers are virtual. I went out and got a usb modem for…
reconbot
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6
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3 answers

Old dial up modem noise explanation

I am looking for a technical documentation on the connection procedure used on the old Dial Up modem that generate this sound: http://www.youtube.com/watch?v=iHW1ho8L7V8 I can't find anything on Google about this, do you know where can I find…
Kedare
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6
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6 answers

Using modem for sending voice recording

I've got an interesting one for you. I've been going over my server monitoring and notification systems (Nagios based), and realized that if our internet connection goes down, there's no way for it to notify me. I already have a modem listening…
ircmaxell
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4 answers

Connections establish slowly, while download rate is great -Linux

EDIT: I have seen this problem elsewhere with an ADSL connection and not only USB modems or cell network. I have my cell network USB modem attached and configured, running under Ubuntu 10.04 The connection is slow in general, although the data flow…
doc_id
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5
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4 answers

How a router decides destination of packet?

I have a basic networking question. Two PCs are communicating on a WLAN. Both the PCs are behind routers or modems. Both the PCs have the same public IP. That public IP is most of the time is either of the router or of the modem. There can be more…
user58859
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4
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0 answers

pppd terminated bya SIGTERM in Centos 7 -- who's sending it?

Folks, I created a script to keep a persistent "emergency" connection with a 3G modem, so I can access my CentOS 7 makeshift server remotely if the usual network fails. Everything works for a few seconds, but then somebody kills pppd with a…
Not your workmate
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4
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1 answer

How to set up Incoming Connection over modem for offline Windows 7 system

I have a Windows 7 computer that will be offline except for a modem connection. From a previous question I have worked around an error setting up the Incoming Connection. (The RemoteAccess service could not start unless a network connection was…
jacobsee
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4
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2 answers

Modem emulator for Ubuntu

Anyone know of an end-to-end modem emulator which supports AT commands? I've tried several Windows products but none seem to work with Cygwin. Something native to Linux and Unix is preferable. And since this is for testing code that needs to…
sven
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4
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3 answers

What's the best solution for datacenter modem dialling?

We have some physical servers that we cannot virtualise because they are connected to analog modems for alert paging. We need to retain this functionality, but virtualise the servers and reduce the pile of individual modems down to something that…
Chris Thorpe
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5 answers

Lots of fax lines in one server?

What is the best way to handle a bunch of fax lines? I'm looking to setup a local fax server that I can pack full of models so 40 users can receive faxes directly to their desktops. Other than adding a ton of USB modems or buying $4,500 Brooktrout…
Jim Mitchener
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3
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2 answers

GSM Modem for linux

I am looking for a GSM modem capable of sending SMS to be used in CentOS 5.3. In the other word, how can I make sure if a specific modem can be detected on kernel 2.6 before buying it.
mtoloo
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