Fast connection

 By: Arfan
Modem (modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such as carrier signals to decode the transmitted information. The goal is to produce a signal that can be transmitted easily and decoded to reproduce the original digital data. Modems can be used for any means of transmitting analog signals, from driven diodes to radio.

The most familiar example is a voice band modem that converts digital data from personal computers to electrical signals modulated in the frequency range of voice telephone lines. These signals can be transmitted through telephone lines and modems demodulated by the other on the receiver side to recover digital data.

Modems are generally classified by the amount of data they can send in units of time, usually measured in bits per second (bit / s, or bps). They can also be classified by the symbol rate is measured in baud, how many times the modem signal state changes per second. For example, ITU V.21 standard used audio frequency-shift keying, tone alias, to carry 300 bits / s using a 300 baud, while the original standard allowed ITU V.22 1200 bit / s with 600 baud using phase shift keying.

Of the many variants of existing modems, are very difficult to be able to determine the best. From the many types of modem I use Huawei E220 modem (HSDPA USB MODEM). This modem HUAWEI TECHNOLOGIES CO. created by., LTD.

I chose this variant because it has proven to be very good in internet connection even if not supported by a good provider.

With tiny design and high speed, Huawei E220 USB Modem redefines mini fashion for the elite. The irresistible creation features the eye-catching sleek design and a great speed up to 7,2Mbps. Its USB cable can be used by both laptops and desktop computers. Put the chic near your hand and enjoy the charm of mini fashion.

1. Main Features

HSDPA/UMTS/EDGE/GPRS/GSM
HSDPA packet data service with a maximum transmission rate of 7,2Mbps
UMTS packet data service with a maximum transmission rate of 384kbps
EDGE packet data service with a maximum transmission rate of 236.8kbps
SMS service
Auto installation, convenient for use
Windows 2000 and Windows XP Operating system

2.Specifications

1) Technical standard   HSDPA/UMTS: 3GPP R99, R5

GSM/GPRS/EDGE: 3GPP R99

2) Operating frequency   HSDPA/UMTS 2100MHz
GSM/GPRS/EDGE 900/1800/1900MHz

3) External interface           Mini USB interface: supporting  USB 2.0 Full Speed

Antenna: Internal antenna

SIM/USIM card: standard 6 PIN SIM card interface

4) Dimensions        89 mm (D) x 43 mm (W) x 14.5 mm (H)

5) Weight    < 50g