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8 votes
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Is an ONT a modem?

Short answer: no, an ONT is no modem. Modem is short for MOdulator/DEModulator and the term is only used for three device classes: telephone modems, DSL modems, and cable modems (thx Cody). These ...
Zac67's user avatar
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6 votes
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Does a dial-up modem support multiple users?

Almost all consumer Internet access links use only a single IP address and many business links as well. A single IP address can't be shared directly but extremely commonly (source) NAT is used. A ...
Zac67's user avatar
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5 votes

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

In the 1990s in a British regional ISP, we had a choice from the telephone company of getting two settings for multiple lines: In the ordinary hunt group, the next incoming call would arrive on the ...
jonathanjo's user avatar
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5 votes

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

From the HOWTO you linked: rotary dial in set of telephone lines When I wore a younger man's clothes, back in the late 1990ies, I ran a bunch of Shiva LAN Rovers (in their IBM guise labelled as ...
Marc 'netztier' Luethi's user avatar
4 votes
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What could cause kvm virtualized pfsense to get 84mbps behind physical pfsense, but then drop to 1mbps when it replaces physical pfsense?

JFL was correct it was a NIC checksum offloading error. My guess is that when my virtual router was behind my physical router it somehow made it so it didn't need to do checksumming. Recap of ...
neoakris's user avatar
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4 votes
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Can a VDSL2 to Ethernet converter be used as a replacement for a bridging VDSL2 modem?

The particular device you have listed is required to be used as a pair. This is for someone who want to extend a network across voice cabling, or for a small ISP to use to connect to customers. It ...
Ron Maupin's user avatar
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3 votes

CSU/DSU's and DSL modems

CSU/DSU is usually only used to refer to T-carrier lines, dubbed digital signal. T-carrier lines use Alternate Mark Inversion line codes. Basically, there are just two symbols - mark and space - at a ...
Zac67's user avatar
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3 votes

Does a dial-up modem support multiple users?

In the 1980s, most of the dial-up connections I saw were UUCP, not IP. Our server would call the various other servers and exchange mail and files. In this way it most certainly was for more than ...
jonathanjo's user avatar
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3 votes

Why Business Class router don't usually include ADSL?

A DSL or DOCSIS modem is a specialized bridging device. Including one in a router is either a cheap gimmick or increases the expense of a business device that will limit its adoption. Spring for the ...
Kit's user avatar
  • 101
2 votes

Does a dial-up modem support multiple users?

The computer connected to the modem would start one PPP (or earlier, SLIP) session, and it would get one IP address from the ISP. So yes, one connection for every dial-up connection. There were ...
mere3ortal's user avatar
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2 votes
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Why Business Class router don't usually include ADSL?

Because "business class" implies use in many situations where the service may be supplied by something other than ADSL. Combined router/modems are pretty much a home/consumer niche device. Getting ...
Ecnerwal's user avatar
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2 votes

Intermittent periods of high packet loss, one hop beyond router

Shielded cable does not perform as well as unshielded cable if it is not properly grounded, and the shield will actually create problems by reflecting internal signals back into the cable. Unshielded ...
Ron Maupin's user avatar
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2 votes
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Can all ports on nowadays switches act as uplink ports?

You can use any switch port as uplink (unless you've got a managed switch and the ports are configured differently). Some early switches had a dedicated uplink port that was the only one capable of ...
Zac67's user avatar
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2 votes
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Can VPN on router connected to the modem bypass a double NAT created by two routers unbridged and connected to each other?

It depends on the type of VPN technology used and if IPSec is used for authentication and encryption and then what type of encryption and data integrity you use with IPSec. I know AH can bypass NATs ...
Dylan Bennett's user avatar
2 votes
Accepted

Modems involved in dial-up connection

Does this mean that, on either side of the connection (the home network and the ISP), there is a modem involved? So the connection goes from a modem at the home network, through the telephone line,...
Ron Maupin's user avatar
  • 99.9k
2 votes

Is an ONT a modem?

An ONT has some sort of modem inside, as the box people normally call a modem does. I mean, modem is short for modulator-demodulator, that is, something that takes a digital signal and modulates into ...
machana's user avatar
  • 61
2 votes

EdgeRouterX not routing traffic

Please check configuration in edge router onces again . Configurations like interface configuration, routing ,ssh configuration ,Nating , make sure edge router egress interface connected to modem and ...
Sagar Uragonda's user avatar
2 votes

How does the computer detect the routers Around?

Wireless access points transmit periodic beacon frames to announce the presence of wireless networks.
Ron Trunk's user avatar
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2 votes
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Can 2 modems connected to the same router interfere with each other if their web access interface are the same IP address?

There's only a problem when they're on the same wire ("broadcast domain") -- but it won't stop either modem from working. And it's only a problem for you as you won't know which one will ...
Ricky's user avatar
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1 vote

What is the usage of PVCs in an ADSL modem settings?

Permanent virtual circuits are logical links that run besides each other. Multiple PVCs can segregate traffic and are commonly used for VoIP, multimedia streaming or standard Internet traffic. Which ...
Zac67's user avatar
  • 85.4k
1 vote

How does the computer detect the routers Around?

WAPs send beacon frames to the STAs, and the STAs can send probe frames. This is all part of the 802.11 standard used by Wi-Fi. Remember that the protocols you are referring to are layer-3 or above ...
Ron Maupin's user avatar
  • 99.9k
1 vote
Accepted

How are Upstream Frequencies assigned for Cable Modems?

Your cable modem receives configuration from the CMTS network. Generally, this is provisioned in their system based on your subscriber MAC address. That's why you have to let them know when you buy ...
Jeff Wheeler's user avatar
  • 5,503
1 vote

Modems involved in dial-up connection

Dial-up access over traditional phone lines is based on the same model as DSL Umm no. Dial-up access operates over the phone network. Your modem dials a phone number that connects to the ISP. In ...
Peter Green's user avatar
  • 13.4k
1 vote

Is an ONT a modem?

So modem conceptually is generally used when you take a digital signal and apply a frequency modulation (pam or qam for example) that encodes multiple bits per symbol/signal. Optical modulations exist ...
Joel Jaeggli's user avatar
1 vote
Accepted

Configuring Cisco ISR 1861 with External Cable Modem

ip route 0.0.0.0 0.0.0.0 FastEthernet0/0 ipv6 route ::/0 FastEthernet0/0 Never do that. That's proxy-arp. Too many people do that with zero clue what it actually means... that's not a dialup ...
Ricky's user avatar
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1 vote
Accepted

Modem configuration with many public ip

This is basic routing, a function that normally routers perform by default, without any special configuration other than setting the IP addresses on the interfaces. Assuming the ISP take care of ...
JFL's user avatar
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1 vote
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Modem/device that can connect and route calls depending on type?

Apparently, you are overthinking this. With a PBX you get as many PSTN lines as necessary for the total number of simultaneous PSTN calls that you may have. Usually, you get a DID range that is ...
Ron Maupin's user avatar
  • 99.9k
1 vote

Specific web site traffic on 2 ISPs

You can do outbound routing to specific destination with static routes. You can prefer one of ISPs for particular site inbound with BGP and your own PI pool. You can do advanced routing decision with ...
ar_'s user avatar
  • 1,133
1 vote

Are modems needed to connect routers?

A router transfers packets between two (or more) different networks. A typical case is a router sitting between the home or office network and the ISP's network. A more complex case might have several ...
Klaws's user avatar
  • 111

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