Questions tagged [modem]

For questions about modems in relation to computer networks and network devices. Remember that only on topic modem network devices should be used. For instance, your company has an ADSL modem, that might be defect.

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why is modem not needed for wireless Internet connection? [closed]

I have studied that Modem is needed to connect a computer/LAN to Internet through telephone line/cable. This is for modulation and demodulation of data - digital to analog and analog to digital. I ...
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ARRIS CM820S modem and WiFi [closed]

this if my first post on this stack! I've recently moved in a flat to see an Arris CM820S modem, which is working fine when i connect it directly to the PC using standard RJ45 cable, which is the only ...
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34 views

Cisco packer tracer training - exercise 2.1.1.5 [closed]

I’m currently starting Cisco and using the packet tracer course, but I’m having an issue with a section creating a simply topology. Everything good apart from one thing which is from wireless router ...
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53 views

Modems involved in dial-up connection

I am currently studying the textbook Computer Networking -- A Top-Down Approach (7th Edition) by Kurose and Ross. In a chapter on Home Access: DSL, Cable, FTTH, Dial-Up, and Satellite, the authors ...
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1k views

Is an ONT a modem?

I was helping a friend set up a simple home network after a move recently. He referred to his ONT as a modem, and I was tempted to say "well, actually, that's not a modem..." I didn't, because I ...
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118 views

Internet Entry Point

I am learning netwroking and would like to ask about how exactly we (as a casual user) get connected to internet and how a datacenter would do the same thing. i bet they dont use a regular modem which ...
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42 views

CSU/DSU's and DSL modems

I read a few times that DSL modem isexample of CSU/DSU. To my understanding CSU/DSU connect digital communication method to digital while DSL modulate digital communication to analog. If so, how can ...
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57 views

Simulating TCP/IP Illustrated Test Network [closed]

I just recently bought TCP/IP Illustrated volume 1 first edition for cheap and I see that they reference a test network throughout the book that looks like the following Now I'm not the sharpest tool ...
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2k views

Can VPN on router connected to the modem bypass a double NAT created by two routers unbridged and connected to each other?

I can't seem to get my head around this scenario. If I am right, a VPN configured on the client-side/workstation would definitely bypass double NAT but on this scenario: Modem <-bridged-> Router ...
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394 views

What is a “rotary dialer” in the context of dialup connections?

Some friends and I have discussed setting up a PPP dialup Internet gateway (solely for private use) for fun/nostalgia purposes. I've been reading through the Linux-PPP Howto at TLDP (old, I know, but ...
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77 views

Is the `twisted-pair` line transfer `digital data` and `ADSL` line transfer the `modulated electrical signal`?

From the WiKi: Modem (modulator–demodulator) is a network hardware device that modulates one or more carrier wave signals to encode digital information for transmission and demodulates signals to ...
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1k views

Can all ports on nowadays switches act as uplink ports? [closed]

I basically know nothing about networks (I just learned what switch meant yesterday), and English is not my first language but I hope I can make my question clear. So I just moved into a new house, ...
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1answer
109 views

Configuring Cisco ISR 1861 with External Cable Modem

I picked up an 1861 for cheap and I am trying to set it up for home lab. I have taken the Cisco courses for CCNP and I think if this was just a regular router or switch I would be OK, but I can't ...
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1answer
851 views

Intermittent periods of high packet loss, one hop beyond router

I've been trying to diagnose internet connection issues at a remote small business for which I am the system administrator. If this is not the proper Stack Exchange to post to, I'd really appreciate ...
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50 views

Modem configuration with many public ip [closed]

I need to configure a modem for my asdl connection. I have 4 public ip to manage: 1 for my modem the others for servers that are on my LAN The situation is this: My problem is: which is the ...
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165 views

Does a dial-up modem support multiple users?

Since I have never worked with a dial-up modem, I was wondering if it created an internet connection for only one user, a point-to-point connection, or if it also supported multiple users.
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856 views

What could cause kvm virtualized pfsense to get 84mbps behind physical pfsense, but then drop to 1mbps when it replaces physical pfsense?

I'm scratching my head on what could cause the following behavior: Scenario A: Laptop -> virtualizedpfsense -> switch -> physicalpfsense -> modem speedtest.com gives me 84mbps download (...
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1answer
231 views

Modem/device that can connect and route calls depending on type?

There are ways of allowing fax machines to share the same line as telephones and telephone answering devices. Back in the BBS days, a lot of people had dedicated phone lines for their BBS. A caller ...
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1answer
413 views

Can a VDSL2 to Ethernet converter be used as a replacement for a bridging VDSL2 modem?

I've got my own network infrastructure already, but I'm tied to my ISPs modem which is a bit on the flaky side. The modem is in bridging mode, with the perimeter router behind it handling ...
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145 views

Specific web site traffic on 2 ISPs

There's a company (B2B interface) that provide certain services through a custom ISP (DSL), but this limits the internet connection only to this site, and on the office we have an regular ISP (DSL) ...
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98 views

Why Business Class router don't usually include ADSL?

I am shopping for a good VPN router to replace my terrible stock ADSL modem + router from my ISP, which need to be restarted 4 times a day. This is for my office use, which connected by around 17 ...
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295 views

Are modems needed to connect routers?

I apologize for the stupid question; I'm trying to wrap my head around the basics of networking. Also, please feel free to direct me to the right SE forum, if this is not the right place. My question ...