A device for sending a digital signal down an analog line

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155
votes
7answers
25k views

Why did dialup modems make noise?

I know that the signal was just tone pulses but why was it when (back in the 90s) when you first connected to the internet you heard a bunch of funny noises. After that if you were to use the internet,...
34
votes
3answers
20k views

Use a smartphone as a Dial Up Modem?

Most cellphones today have an audio jack that works as both output and input for sound. That's why there's headphones today with built in microphones for making phone calls. Now then, is it possible, ...
22
votes
8answers
4k views

What are the disadvantages (if any) of accessing the internet through two or more “chained” routers?

My Problem I just got internet setup in my dorm room at school through a third-party provider. The modem they gave me, however, also functions as a wireless router. I also have my own router with ...
15
votes
3answers
8k views

Receive and route phone calls through computer

I volunteered to work for a political campaign. We want to make a unified number (with multiple lines) to put as contact us number. We want it to work like customer support numbers, you call a fixed ...
12
votes
5answers
3k views

What is the cable that runs from the cable modem to a wall outlet

I was wondering what type of cable runs from the modem to the wall outlet in my house? Is it a coaxial cable? I'm very confused by what I've read around the internet. There seem to be many variations. ...
11
votes
5answers
90k views

How to make phone calls using a PC, modem, headphone and no actual phone instrument

I have a phone landline connection and I DO NOT have a phone instrument. I connect the cable into my laptop, and want to make calls using my laptop. I have an HDA CX20561 modem. I seem to be able to ...
10
votes
4answers
6k views

What is the name of this cable that goes into a modem?

I have bought cable internet from teksavvy and the modem arrived however the cable that comes out of the wall and goes into the modem where it's labelled "Cable", is very short. What's the name of ...
9
votes
5answers
4k views

Looking for network simulator (subnets, routers, etc..) [closed]

I am looking for network simulator (subnets, routers,wireless etc..) to study for an interview that I have.
8
votes
8answers
2k views

Cable modem speed test

Are the popular speed tests (cable, dsl, etc) that are available accurate? if so, how? Also, it seems that they only measure download speed of one file and not responsiveness, latency, robustness, etc....
8
votes
2answers
12k views

Are modems, made for a more recent DSL standard, downwards compatible with older DSL technology?

I understand that older DSL modems aren't compatible with newer technology, but is the case same the other way around? I.e.: Is VDSL2 modem compatible with a VDSL connection? What about with ADSL or ...
7
votes
5answers
16k views

Modem/Router/Networking Emulators

I'm looking for a decent source of modem/router emulators. Something along the lines of the following http://www.voiproblem.com/emulators/Netgear/ http://www.voiproblem.com/emulators/Linksys/ The ...
7
votes
3answers
3k views

Connecting two computers via modems (RJ11)

I'd like to recreate old dial-up experience but without actual calling telephone provider's dial-up number. So I thought, maybe a linux machine could host ppp server and accept dial-up calls from ...
7
votes
2answers
1k views

How does AT Commands work?

How does AT commands work? are they interpreted on the modem drivers? or are they interpreted inside the modems?
6
votes
4answers
13k views

How to get access to the web interface of an ADSL modem running in bridge mode?

I have a D-Link DSL-2500U ADSL modem. Its default IP is 192.168.1.1 and default login/password for the web interface is admin/admin. If I plug in the Ethernet cable to the NIC of a computer (that runs ...
5
votes
2answers
21k views

How do I access my modem's GUI when it's in bridged mode?

I wanted to try setting up my ActionTec P5001a DSL modem/router in bridged mode with a Linksys E2500 router for improved NAT performance. Switching the modem to bridged mode and the router to PPPoE ...
5
votes
4answers
2k views

Upon turning on computer, Internet won't work unless I disable then enable connection to router

My PC is connected to a Virgin Media router/modem. After turning on my PC, Internet doesn't work. In "Control Panel > Network and Internet > Network Connections" I see: Local Area Connection ...
5
votes
5answers
728 views

Wireless Router, Wireless Modem, Wireless Modem and Router?

What is the difference between these devices? Which one is used for which purposes?
5
votes
4answers
5k views

Will a Clothes Dryer Cause Interference with a DSL Modem and Wireless Router?

I'm taking steps toward setting up a home file and print server, and other toys and the first step is to have my Internet connection on 24/7. The most sensible place to put it is in the laundry room ...
5
votes
3answers
8k views

How can I use my cell phone to establish a dial-up networking connection?

I am using Windows 7 and have a BlackBerry with T-Mobile (U.S.). I have paired the phone with my computer over Bluetooth, which automatically creates a serial port for it. I am able to open the port ...
5
votes
2answers
527 views

fax to pdf software [closed]

Does anyone now of any software (preferably windows based) that would let me save incoming faxes (over a land line) to pdfs in a folder somewhere? Clarification: I think there is some confusion. ...
5
votes
2answers
2k views

Programmable Answering Machine Software? [closed]

Are there any free or commercial answering machine software that can be programmed to play different message based on the datetime of call? hardware: TAPI voice modem on Windows.
4
votes
4answers
10k views

How important for speed is the length of the phone cable between the wall and the modem?

I have an inconveniently-placed phone jack in my office, so I am running a 10m phone cable from the wall jack to the modem, which is on my desk. Consequently, I have a very short ethernet cable ...
4
votes
4answers
17k views

Differences between a modem, a wireless access point and a router

Can anyone explain the differences between a modem, a wireless access point, and a router? What functions do they share and which functions uniquely characterize them?
4
votes
3answers
5k views

Wifi stops working every 10 minutes on Mac OS X Yosemite [SOLVED]

Every 10-15 minutes, my internet connection fails in the following manner: Cannot load websites Cannot connect to Dropbox Cannot connect to IRC Skype still works Slack still works Still able to ...
4
votes
2answers
9k views

UTP cable for telephone line possible?

One of my customers has build a new house with pre-installed cables for internet. The only thing he didn't think about was installing a cable for his telephone line. Behind his desk, he has a "spare" ...
4
votes
2answers
39k views

How can Huawei E3276 USB modem work on MAC OS X 10.8.4?

I spent over an hour on the help line with the local telecom operator. We could not get the Huawei E3276 USB modem to work on MAC OS X 10.8.4 on a Macbook Air 2013. It works without any problems on ...
4
votes
2answers
611 views

How does a DSL modem know which ISP to connect to?

I am terminating my contract with my old ISP, however, because I've already paid my account till the end of the month, this connection is still active. I have also signed up with a new ISP who mailed ...
4
votes
2answers
4k views

Can I use the voice & SMS features of my GSM SIM through my laptop?

My laptop (a Lenovo T410s) has an internal GSM modem (device manager calls it a Qualcomm Gobi 2000 HS-USB Modem 9205) that I'm currently using a regular (voice, data, text, etc) 3G SIM in. The data ...
4
votes
1answer
30k views

How do I use a Zyxel P660 router as just modem so that I can connect a WRT54GL router in cascade?

I have a Zyxel P660HW-t1 v2 router (which has a DSL port) and a WRT54GL router (which does not) and the exact same situation as in this thread (UPDATE: the connection between both devices is the ...
4
votes
1answer
6k views

Will an ADSL2+ modem work with a VDSL input connection?

I have BT Infinity broadband (UK) which is Fibre to the Cabinet (FTTC) and then VDSL from the cabinet to the property. BT supply a BT Openreach branded modem to work with the VDSL connection. My ...
4
votes
2answers
1k views

PC Phone Modem Software

I'm looking for a piece of software that will let me hook a phone line up to my PC Modem and place calls over it using my mic and computer speakers. Does anyone have any experience with anything like ...
3
votes
3answers
351 views

Why doesnt the internet disconnect when we lift our headset of the telephone?

Some years back there used to be MODEMS and when you recieved a call,the internet used to disconnect,but today it does not disconnect even if I lift the headset of my telephone.How is that achieved? I ...
3
votes
4answers
3k views

Is it possible for software to detect your cable modem's MAC address or any unique factor about it?

Is it possible for software to detect your cable modem's MAC address or any unique factor about it? I'm assuming you can't but I want to double check.
3
votes
7answers
10k views

What is the main reason for ADSL modem/routers dying?

The other day my home ADSL modem/router (dwg 684t in this case) died. A guy from the telecom company came to my place and brought another one, but he also left this one. Now, I'm interested - it didn'...
3
votes
4answers
45k views

How can I bridge a Verizon mobile hotspot modem/router to a Linksys router?

I recently purchased a Verizon mobile hotspot (MiFi 4510L) and was wondering if I could configure my Linksys wireless/wired router (similar, but not the exact model: Linksys router) to use the MiFi as ...
3
votes
8answers
11k views

Mac Mini’s Internet connection is very slow, every other device’s connection is fine. (PC, iPhone, Xbox 360)

I recently haven’t used my Mac Mini for about 5 days (however it was left on). I seem to be able to connect and get great download / upload speeds through my PC, Xbox 360, iPhone and parents’ laptop. ...
3
votes
2answers
941 views

Is a DSL splitter required, if only a Modem is attached to the line?

Annex B is the current standard for digital subscriber line (DSL) in Germany. A DSL-splitter is an analog L-C-filter to separate the POTS (plain old telephone service, like voice and ISDN, FAX) ...
3
votes
5answers
3k views

What are the uses of a modem installed in a computer?

This might sound like a stupid question, but when I'm upgrading my pre-built computers, I always have to remove a pre-installed PCI (or PCI-E x1) modem to make room for other parts. So I'm wondering - ...
3
votes
7answers
9k views

Pros/cons to turning off cable modem

A little off the wall perhaps, but ... I have a cable modem and a router for a wireless home network. Is it a good or a bad idea to turn it off at night and during the day when we're all at work or ...
3
votes
6answers
118 views

Which home modems and other network gear for reliability? [closed]

Do you have a home modem/router that occasionally doesn't function exactly like it should. I find this weird behavior completely unpredictable and I can only guess that maybe it is overheating. Does ...
3
votes
1answer
114 views

Why is USB Serial so fast in linux?

I've just started using a 3G modem on a RaspberryPi using the "stock" USB Serial driver from the linux kernel (as indicated in the modem documentation). Once the modem was recognized and appeared as a ...
3
votes
2answers
16k views

How to force a Huawei E3276 LTE modem to only mount as a modem?

I have a Huawei E3276 LTE USB-modem and I need to force this modem to only mount as a modem when connected to the computer. Per default, the modem also mounts as a CD-drive and a USB mass storage ...
3
votes
1answer
1k views

How can I tell if my internet speed issues are coming from my wireless router or from my ISP?

For the past couple of months I've been having major internet connection stability issues with my ISP (Charter). I have their 100Mbps package, but most of the time the speeds are all over the place. ...
3
votes
3answers
9k views

Motorola NVG510 bridge mode

I have a Motorola NVG510 modem from AT&T, and I would like to disable all routing functions and use it as just a modem. I have a Time Capsule that's already connected and broadcasting its own ...
3
votes
1answer
383 views

How can I connect directly to a peer using a DSL modem?

I was wondering if it's possible to connect to a friend using a DSL modem. I know that with voice-band modems, you can dial numbers and have a peer's computer answer the call and communicate with ...
3
votes
2answers
2k views

What (traditional) modems work with Windows Vista 64-bit or Windows 7 64-bit?

I have a US Robotics v.Everything modem that I occasionally used for fax and Internet dial-in backup access. However, that modem connected to my previous PC using a plain RS-232 9-pin serial port. ...
3
votes
1answer
3k views

Wireless router that doesn't need a desktop

I have a single desktop PC here at my house, and I'm about to get a new laptop. Currently, I connect to my internet provider through a modem connected directly to my desktop, but I want to get a ...
3
votes
1answer
10k views

What happens when I plug a router into another router?

I've recently switched ISPs, and the new one provided me with a modem (that what you call those things?) that doubles as a router. I used a router on my previous ISP for wireless networking, but I've ...
3
votes
5answers
683 views

How to include a short digital message in a sound recording

I wish to superimpose a short digital message, less than a kB, at an above audible frequency, but still low enough to be transmitted over FM radio stations, and then detect and decode that signal. ...
3
votes
3answers
541 views

Where in my network should I set DNS servers for the best performance?

I have a DSL modem, a router, and a Windows machine. Each piece of equipment can set the DNS server IP addresses or be set to automatic. Where/how should the DNS servers be set for best performance?