In Device Manager, right-click the serial port labled Communications Port (COM1), and select Properties. Select Port Settings tab.
A DC jack exists for the purpose of supplying direct current to a device from an external source, as opposed to the batteries inside the device. The external DC power would likely come from an AC to DC adapter that you plug into the wall. Such a jack can also work with car adapters too, provided it it converted to the correct voltage. So using an external source keeps you from using the batteries. With some equipment, that can charge the battery as well, but devices using disposable batteries are wired as to not charge the batteries.
It can be converted using a Shift register. A Serial-In-Parallel-Out(SISO) shift register is used to convert temporal code to spatial code. A Parallel-In-Serial-Out(PISO) shift register is used to convert spatial code to temporal code.
Most fan capacitors are electrolytic and non-polariced. The trick is that two electrolytic capacitors are connented together in a single package. The negative terminals are connected together internally and the positive terminals form the external leads. For more information, visit books.google.co.ke.
Only one bit is being sent at a time, so your data bus can be as small as a single trace/wire. However, on the flip side, your data is only being sent one bit at a time, leading to slower transmission, as well more complicated timing of signals.
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In the past external modems connected to the COM (or serial) port. However, most modern external hardware is USB these days, modems are no exception.
Setting Up dial Up connection By using CDMA Wireless modem?
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Using the com port
It depends on the type of modem. Serial modems must be connected to a PC serial port and configured manualy. Serial modems are rarely ever used now. PCI modems must be installed into a spare PCI slot on the inside of the PC, the modem should auto configure. USB modems should be plugged into a USB port and like PCI modems should auto configure.
Usually modems do not require any configuration. But your router has to configures to get external IP from a DHCP server or whatever your internet provider is using.
You have to have a modem unless you have dsl which your dsl modem can plug into the usb and operate properly otherwise you have to have an external modem to plug into the usb then the phone line. not knowing what you have to try and connect to the net is hard to answer, are your using an external modem, are you using dsl modem, either one of these should come with the software that will name your usb port as your com port, if not you can use someone elses computer and look-up the brand of whatever your are using to try to connect and download the software to a floppy disk or hopefully be able to burn it to a CD, then install it on yours, theres lots of info out there and lots of free downloads if you are able to use the internet somewhere else. good luck
A GPRS modem can be connected to a system via USB, serial port, or Ethernet, depending on the modem's design. For USB modems, simply plug the device into a USB port and install any necessary drivers. Serial modems typically connect using a serial cable to a COM port, while Ethernet modems can be connected to a network router or switch using an Ethernet cable. Once connected, configure the modem settings through the system's network settings or dedicated software to establish a data connection.
It depends on what you are using it for. I am using one with no modem to connect to my printer.
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.
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modemModem stands for modulation and demodulation. Modem is device that converts digital signal into analog and analog signal into digital. Modem sends and received data from one computer to another through telephone lines. The sending and receiving computers both must have modems.The process of converting digital signal into analog signal is called modulation computer store data in digital form. Since a modem transmits data using telephone lines. So it is converted from digital to analog from.The process of converting analog signal into digital signal is called demodulation. The modem on receiving computer receives data in analog form. The incoming analog data id converted back into digital format to be used by computer.Features of ModemSome important features of modem are as follows:1. Speed: speed is the rate at which the modem can send data in bps. Typically modem speeds are 300 bps to 56bps.2. Self- Testing: Modem can teat the digital connection with computer. It can also test analog connection with remote modem.3. Voice over Data: Modem provides the facility of voice conversation while data is being transmitted. Both the source and destination modems should have this feature.4. Error Control: Modem use different methods to control errors for transmitted data.Different types of modems :Different types of modems in terms of physical size and shape are as follows:External ModemExternal modem is attached to the system unit as an external device through telephone line. It is connected to the telephone wall jack by another cable. External modem is connected to computer using serial cable to COM1 or COM2 port. It requires external power supply. It is easy to setup. External modem is expensive.Internal ModemInternal modem is a circuit board that is inserted into an expansion slot on the motherboard. Internal modem cannot be moved from one computer to anther easily. It is difficult to setup than other types of modem. It is less expensive than external modem.Wireless ModemWireless modem transmits the data signals through air instead of cable. It also known as radio-frequency modem. It is designed to work with cellular technology and wireless local area networks.