USB modems for CDMA standard

At first glance, it may seem that little USB users need modems. However, this is a delusion. And that's why. Indeed, the vast majority of the network equipment currently on the market for communicating with a computer uses the Ethernet interface. The reason for this is trivial: this standard involves a cable connection to the provider, which is characterized by high speeds of access to the global Internet. But various USB-modems, as a rule, use a wireless method of communication, which, alas, does not differ commensurate speed. Nevertheless, they also find their customers.

Internet in the air

To make the article not too abstract, let's look at USB modems designed to work in networks of CDMA operators. All of the above applies in part to the GSM standard.

Now various portable devices are very popular - laptops, netbooks, tablets, etc. That is, all those that can be called mobile. It is clear that "mobility" and "Internet on the wire" are incompatible concepts. To solve this problem, many operators began offering services for accessing the Network via a wireless channel. It's enough just to find out what USB modems are, to buy the model you like, and after signing a contract with the appropriate provider. No cable laying is required. The network is located where the signal of the base stations is fixed .

Problem of choice

Of course, you do not need to choose USB modems in appearance (although this is also important), but taking into account its capabilities.

So, CDMA modems can work in one of three modes: low-speed 1x (up to 153 Kbps); Medium-speed 3G (up to 3.1 Mbps) and high-speed (up to 14.7 Mbps). Compatibility is saved from the top down, that is, a device supporting 14 Mbps, quite successfully copes with two other standards. Before purchasing a modem, you need to find out which standard the selected operator is working with.

Sometimes in stores offer to buy a USB-modem amplifier. This device is necessary in the event that it is planned to use wireless access in the weak signal zone. Once installed on the modem, it catches the waves and concentrates them around its built-in antenna, thereby improving communication. Efficiency depends on a number of parameters. For stationary use it is more rational to purchase a modem with a connector for connecting an external antenna.

Often, manufacturers try to attract attention to their products, offering a solution with the option of connecting a memory card, which turns the modem into a USB flash drive. This addition almost does not increase the final cost, so many are in demand.

When buying a modem, it is recommended to check it for 10-15 minutes. Unsuccessful models during this time have time to get very hot.

Setting up a USB modem

As mentioned above, the main problem with wireless devices is low speed. Even the claimed 14.7 Mbits are unattainable - the providers knowingly indicate "before" before the numbers. Partially improve this figure can be through customization. First you need to determine the level of the signal - for this you can use the Axesstell program. If its level is insufficient (more than -100dB), then an external antenna or signal amplifier should be connected. Only after this, you can proceed with the software configuration, otherwise it will not bring significant improvement. The easiest way to affect the operation of the device is by installing the latest driver version. Other possibilities require certain knowledge in the field of CDMA-modems, therefore they are considered in detail at thematic forums.