Computer Hardware

Computer Modems Information

A modem refers to a device that adjusts an analog carrier signal so as to encode digital information as well as demodulate that carrier signal to decipher the information that is transmitted. The aim is to create a signal that can be easily conveyed and decoded in order to reproduce the original digital data. Modems can be applied over any means of analog signals transmission, from driven diodes to radio. The focus here is computer modems.

Generally, modems are grouped based on the amount of data that can be transmitted through them in a specified time, which is usually measured in bits per second (bps). They can be also grouped by Baud how many times the modems signal state changes per second. Modems that function faster are utilized by internet users daily; obvious among such modems are the cable and ADSL modems.

The Soft-Modem

Soft-modem also known as a Wind-modem is a stripped down modem which substitutes tasks conventionally handled in hardware and software; in this situation, the modem is a non-complex digital signal processor fashioned to produce voltage variations or sound on the telephone line. In comparison to the traditional modem, soft-modem is less expensive since they are characterized with fewer hardware components. One notable weakness is that the software producing the modem tones is complex and the general performance of the computer is unpleasant when it is in use. Another weakness is that of absence of portability.

The present day standard modem comprises of 2 functional parts: an analog section for signal generation, the digital section used for set up and control. The functionality is practically incorporated into one chip; the division exists only in theory. Operationally, the modem can be in a single mode or two; namely data mode and command mode.

Modem for a Laptop (Speed Enhancement)

The 300 bit/s modems utilized audio frequency-shift keying to transmit data. The stream of 1s and 0s in computer data is decoded into sounds which can be transmitted with ease. In the one thousand and two hundred bit/s and other faster systems (phase-shift keying), the tones either one side of the connection are transmitted at similitude frequencies just like the 300 bit/s system.

Wireless data modems are utilized in the WiFi and WiMax stadards. Basically, WiFi is used in laptops for wireless access point and wireless application protocol.

What it costs to use modem (particularly the cellular modem) will depend on the country. A number of carriers apply flat rate plans for unlimited data transfer and some specify maximum limits on the quantity of data that can be transferred on a monthly basis. In some other countries, fixed rate charge plan may be in use for every transferred data (per megabyte or Kilobyte of downloaded data).

Computer modems and modems is a vast topic that cannot be exhausted here. Only some aspects have been selected and discussed. You can explore further for more information on this subject. Theres still much to understudy about modems and computer components generally.By: Computer KnowledgeArticle Directory: http://www.articledashboard.comJeffrey Frasco is author of this article on Computer Components. Find more information about Input Adapters here.