Difference between Modem & Ethernet Card/Cables?

  spuds 14:45 29 Mar 2007

This is more to do with point of entry and the correct cables required. On an Ethernet card the socket as connections for 8 wires, and a modem card as connections for 4 wires.

Taking in consideration that the 4 wire plug can fit an Ethernet card socket, not visa versa. My query: What is the difference between a modem card and a Ethernet card- function wise.And what is the difference between RJ11/RJ45/BT Plug/Crossover/Patch etc?.

Explanations in the easiest possible terms please.

A website link explaining this, would be appreciated for simplification and ease of passing the information on.

Any help advice appreciated.

  Woolwell 14:56 29 Mar 2007

Bookmarked - I have the same question arising from a problem with a friend's PC.

  spuds 18:12 29 Mar 2007


  Ashrich 21:44 29 Mar 2007

For RJ45/Ethernet Cable/Crossover cable diagrams click here Definition of a modem click here Definitions of an Ethernet card click here Hope these might give you some interesting reading .


  spuds 12:40 30 Mar 2007


  dms05 12:59 30 Mar 2007

An Ethernet card/cable is for Networking at speeds upto 100Mb/sec. You can directly connect 2 computers using anethernet crossover cable where the Send/Receive signal wires are swapped over. If you have more than 2 computers you connect with a Patch cable through a Network Switch which directs the traffic for each computer on the network. RJ45 cables have 8 wires but only 4 are used. However these are not necessarily the same wires as used in a modem cable. The equivalent to an Ethernet Crossover cable would be a Null Modem cable where the wires are swapped over.

Never use the phone style cable in an Ethernet network. The socket might superfically accept the smaller phone plug but at 100Mb/sec it wouldn't be a good enough fit.

Ethernet is used to Network computers and devices. Modems are used for connection to a phone line, both ADSL and Dial Up connections require a modem. DSL is a cable supply (ie Virgin Cable) and doesn't require an ADSL modem but it's own special equipment.

So Ethernet for connecting PC's together, Modem for connecting to the Internet.

  recap 13:23 30 Mar 2007

is a standard phone outlet jack with 4 wire connections.

Registered Jack-45, an eight-wire connector used to connect computers onto a local-area networks (LAN), especially Ethernets. RJ-45 connectors look similar to the RJ-11 connectors used for connecting telephone equipment, but they are a bit wider.

Crossover Cable
Type of networking cable that connects two computers or network devices directly to one another. When purchasing this type of cable, the packaging must indicate that it is a crossover cable for the required network interface.

Patch Cable
A cable, much like a phone cord, used to connect an individual computer to a network.

  spuds 13:35 30 Mar 2007

Any links to any good websites with pretty picture for possible downloads.

Looked at a few college and academic websites, but mainly reams and reams of technical reading/writing.

This thread is now locked and can not be replied to.

Elsewhere on IDG sites

The Evil Within 2 review-in-progress

InVision Studio takes on Adobe XD and Sketch

iPhone X news: Release date, price, new features & specs

Comment transformer un iPhone en borne Wi-Fi ?