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A wireless network interface controller (WNIC) is a network interface controller which connects to a wireless network, such as Wi-Fi or Bluetooth, rather than a wired network, such as a Token Ring or Ethernet.

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A wireless USB hub is a hardware device that converts data transmitted by connected devices into WiFi signals that can be forwarded to other users on the network.

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Devices that need access to the network connects directly to the hub, which communicates with your WiFi router so that your information is available to other users on the network.

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A modem is a device that sends information between the wide area network (WAN) and your home. This converts the incoming connection to an ethernet, allowing the router to connect to the internet.

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A wireless access point is a network device that interconnects wireless communication equipment to form a wireless network that interconnects mobile devices or wireless network cards.

The Access Point is then responsible for being a gateway to the wireless network in a specific location and for a specific radio coverage, for any device that requests access, as long as it is configured and has the necessary permissions.

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Is a device that performs the functions of a router and also includes the functions of a wireless access point. It is used to provide access to the Internet or a private computer network. Depending on the manufacturer and model, it can function in a wired local area network, in a wireless-only LAN, or in a mixed wired and wireless network.

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Is a type of Wireless Access Point.

Main features

- long range (183 m)

- for use inside buildings

- innovative antenna

-  24V Passive PoE

- optimal RF performance

-  easy installation

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Some features

-Connectivity Wi-Fi standards b, g, n

-Wi-Fi frequency band 2.4GHz

-Wi-Fi features with WMM, with WDS, with MIMO

-LAN connection 2 x RJ-45

-2.4 GHz signal booster 9 dBi

-Number of antennas 2.4 GHz 2

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We can also found a internal modem, which is a expansion card which connects to the motherboard of our PC

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An analog device that amplifies an input signal, regardless of its nature (analog or digital).

Within the term repeater there are several types:

We can refer to a simple device whose function is to repeat the signal it receives, as in the case of wifi repeaters.

We can also refer to installations or complexes of installations that repeat radio and television signals,to those that repeat mobile telephony signals.

Data handling

Repeaters can be divided into two types depending on the type of data they handle:

Analog repeater

This type is used in channels that transmit data in the form of an analog signal in which the voltage or current is proportional to the amplitude of the signal, as in an audio signal. They are also used in trunklines that transmit multiple signals using frequency division multiplexing (FDM). Analog repeaters are composed of a linear amplifier, and may include electronic filters to compensate for frequency and phase distortion in the line.

Digital repeater

The digital repeater is used in channels that transmit data by binary digital signals, in which the data is in the form of pulses with only two possible values, representing the binary digits 1 and 0. A digital repeater amplifies the signal, and it also may retime, resynchronize, and reshape the pulses. A repeater that performs the retiming or resynchronizing functions may be called a regenerator.

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A wireless repeater (also called a wifi repeater or a wifi range extender) is a device that relays an existing signal from a wireless router or wireless access point to create a second network.  Wireless access point and retransmits it to create a second network.

Uses:

When there is no wireless hotspot in an area

In an area with much interference.

Interference can be caused by many environmental factors such as microwaves (such as from a microwave oven), metal appliances or metallic coating or an impeded line of sight.

When the distance between the computer and the wireless access point or wireless router is too great for the internal wireless network interface card to receive the wireless signal.

When networking in an environment with interference and multiple computers, networks or hubs

Drawbacks:

Since only one wireless device can transmit at once, wireless transmissions are doubled (router to the repeater and then repeater to the client versus just router to the client), and so:

Wireless throughput is reduced by at least 50%.

Wireless interference (e.g., with other networks on the same channel) is at least doubled.

Potentially opens another security attack vector. Older devices don't always support WPA2, so while the original network might be secure, the secondary one is potentially open.

Connectivity

Some wireless range extending devices connect via a USB port. These USB adapters add Wi-Fi capability to desktop PCs and other devices that have standard USB ports. USB supports not only the data transfers required for networking, but it also supplies a power source so that these adapters do not require electrical plugs.