To exchange data between two DTE devices
A device is an example of technology. A null modem cable is a device.
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.
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.
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.
You can use a null-modem cable; alternately, you can use a USB or FireWire cable.
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
Coxial cable is used from the wall to the modem. From the modem to the computer an RJ-45, or ethernet, cable is used.
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.
cross cable
null 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?
You could use: * a floppy * a USB Flash drive * a null modem cable * a LapLink cable * an external hard drive * a DVD