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A null modem is a cable connecting two serial ports with the input and outputs and device control lines crossed over, so the input pin on one port is connected to the output pin on the other, and so on. It is also called a 'cross-over cable'.
A null modem allows two computers to be connected together using their serial ports without using modems (hence null modem).
If you used a standard ('straight') serial cable, the two inputs would be connected together, and the two outputs, and so on, so the computers would not be able to communicate. Modems have their data and control pins reversed internally, so a 'straight' cable is used between a computer and a modem.
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Is null modem a device or technology?
A device is an example of technology. A null modem cable is a device.
What is the purpose of a modem cable?
The purpose of a null-modem cable is to permit two RS-232 "DTE" devices to communicate with each other without modems or other communication devices (i.e., "DCE"s) between them.
Where could one find a null modem serial cable for purchase?
You can find a Null Modem Serial Cable for sale from stores such as Walmart, Tiger Direct and Radio Shack. You can also get these cables from retailers such as Amazon.
What is a null modem cable?
A null modem cable is a cable which connects two computers directly. The connection is made using serial interface and actually requires no modem or phone line. These connections can be useful for some legacy applications, however due to the availability of low cost networking equipment null modem connections are now rarely used.
How can you connect two computers physically?
You can use a null-modem cable; alternately, you can use a USB or FireWire cable.
When is a null modem cable used?
To exchange data between two DTE devices
What is rollover connection?
Rollover cable (also known as Cisco console cableor a Yost cable) is a type of null-modem cable that is often used to connect a computer terminal to a router's console port
Cable Modem?
form_title= Cable Modem form_header= Repair or replace your cable modem. Do you need to replace your cable modem?*= () Yes () No What is your budget for a cable modem?*= _ [50] Do you need help with the repairs or installation?
How do you install a LAN driver to windows ME without a CD?
You could use: * a floppy * a USB Flash drive * a null modem cable * a LapLink cable * an external hard drive * a DVD
Is a modem a cable?
The ethernet cable is the cable with end plugs similar to a phone cable but a little larger in appearance. The cable modem may have one leaving it to go to your PC or your router for a home network
Is a cable modem and a dsl modem the same thing?
No, a cable modem connects to a cat5 coax cable and a DSL modem connects to a standard phone line.
If you have a cable modem do you still need to have a phone line attached to THE PC?
No, just connect the cable to the cable modem and then connect the modem to the computer.
