دانگل وای فای با برند ezcast

Introduction

Just as no man is an island, a computer needs to be connected to its network, and in turn the Internet, to be truly useful. While a wired Ethernet cable is preferable for many applications, the reality for many is that Wi-Fi is more convenient.

The wireless network starts with a broadband modem able to communicate with an Internet Service Provider (ISP), which facilitates your access to the Internet. Unless that modem has wireless functionality built-in, it'll probably be attached to a wireless router through an Ethernet cable. Most Wi-Fi-enabled routers also give you a handful (in the neighborhood of four) Ethernet ports for wired devices close by. It's what broadcasts your wireless signal.

In turn, the client devices connecting to the network (say, your workstation, tablet and smartphone) need to have wireless radios integrated and enabled in order to transmit and receive data over the network. If your PC doesn't already have a wireless adapter, you have several options for adding one. Given the ubiquity of USB, many folks find that interface to be the easiest. The attached Wi-Fi adapter allows the computer to communicate wirelessly with the router, and in turn the modem.

Wi-Fi Adapter Categories

There are several different ways that Wi-Fi can be enabled on a computer, and each implementation has its own pros and cons that you should be aware of, including:

USB: USB Wi-Fi adapters are easy to install. Simply plug one into an available port and download its drivers (if your operating system doesn't already include them). Of course, their external nature means that USB adapters consume at least one port; many are so large that they block others as well. And they stick out, which many enthusiasts disdain enough on their svelte PCs, much less their diminutive notebooks.
Desktop Motherboard:In some cases, the Wi-Fi adapter is either built into the motherboard itself or integrated as an add-on accessory. While this can be convenient, and does not take up any space you'd want for other peripherals, these adapters are in the middle of a metal case. Most include antennas that require routing outside of your chassis to avoid issues with signal strength and interference.
Integrated: In some cases, the Wi-Fi is built directly into the device, such as with smartphones and tablets. The advantage of this setup is obviously that you get functionality within a convenient form factor. Unfortunately, that makes upgrades difficult or impossible, limiting your ability to keep pace with wireless standards.
PCIe: PCIe stands for Peripheral Component Interconnect Express. Compatible cards fit into slots on your PC's motherboard, and require access to the system's internals. They frequently have antennas that protrude out the back of the card in order to maximize range. Notebooks typically have smaller slots on-board that accommodate mini-PCIe wireless cards. Typically, these slots come populated. But standardization makes it possible for an end-user to remove and upgrade to a faster Wi-Fi adapter down the road.

Wi-Fi Standards

802.11ac is the current Wi-Fi standard. It uses both the 2.4GHz band (like 802.11b and 802.11g) and the 5GHz band (like 802.11n). The next standard, 802.11ad, is reportedly due this fall and adds a third frequency to the mix (60GHz) and is designed for high bandwidth over short distances.

With 802.11ac as the current Wi-Fi standard, 802.11n-based gear is quite affordable. Naturally, you'll ask yourself whether you should save some money on that older equipment. While you can certainly get acceptable performance from 802.11n, at this point I'd recommend springing for the more modern standard. Much of the early price premium is gone, and 802.11ac does offer some benefits, detailed below.

Within modern 802.11n and 802.11ac Wi-Fi adapters, there are several different speed tiers:

Type	2.4GHz Mb/s	5GHz Mb/s
N150	150	N/A
N300	300	N/A
N600	300	300
N900	450	450
AC600	150	433
AC1000	300	650
AC1200	300	867
AC1900	600	1300

Notice that adding throughput from the 2.4GHz and 5GHz bands gives you the equivalent nomenclature. For example, N600 is precisely the sum of 300 and 300. However, the math is not as clean for AC1200 since 300 and 867 give us a sum of 1176. This gets rounded to a nice even AC1200, which is easier to remember.

Wi-Fi 802.11ac

802.11ac introduces other innovations and advancements to Wi-Fi. These include:

Dedicated 5GHz bandwidth. While the range of 5GHz is typically less than 2.4GHz, the 5GHz band is significantly less congested and faster - two advantages that make it worth using.
While 802.11n channel bonding maxed out at 40MHz, 802.11ac offers this at 80 and even 160MHz. Recall that bonding is the method by which a single 20MHz channel can be combined with other channels to create a multilane highway to enhance data transmission speeds.
802.11n used 64 QAM (quadrature amplitude modulation); 802.11ac increases this to 256 QAM, which is 33% more efficient.
802.11n MIMO (multiple in/multiple out) maxed out at four spatial streams, while 802.11ac doubles this to eight, doubling data throughput.

Modern USB Wi-Fi Adapter Examples

Some examples of current USB Wi-Fi adapters include:

USB 2.0 Versus 3.0

It is no surprise that current 802.11ac adapters utilize USB 3.0. The USB 2.0 standard, so called “Hi Speed,” theoretically maxes out at 480 Mb/s (60 MB/s), and USB 3.0 standard, also known as “Super Speed,” increases that to 5 Gb/s (625 MB/s). Of course, real-world throughput is usually quite a bit lower.

With 802.11ac's peak data rates exceeding what USB 2.0 is capable of over the 2.4GHz and, even more dramatically, the 5GHz frequencies, the use of USB 3.0 becomes mandatory for the necessary throughput.

دانگل وای فای با برند ezcast

خرید اینترنتی دانگل وای فای

Introduction

Wi-Fi Adapter Categories

Wi-Fi Standards

Wi-Fi 802.11ac

Modern USB Wi-Fi Adapter Examples

USB 2.0 Versus 3.0

آرشیو

آخرین پست ها

خرید اینترنتی دانگل وای فای

نویسندگان

آمار وبلاگ

اَبر برچسبها