1. How to use wireless hotspots?
To use wireless hotspots, your computer must be equipped with Wi-Fi certified radios, such as external PC cards or integrated wireless LAN connectivity (as provided by Intel and Centimeter mobile computing technology). In addition, you also need to choose a wireless service provider as your ISP, usually providing paid wireless Internet access services with T1speed.
2. What is wireless network?
Generally speaking, as the name suggests, wireless means using radio waves as the transmission of data. In terms of application, it is completely similar to the use of wired networks. The biggest difference between the two is that the medium of transmitting data is different. In addition, because it is wireless, the maneuverability of hardware installation or use is much better than that of wired networks.
3. What are the advantages of wireless networks compared to wired networks?
In terms of use, its mobility and convenience are beyond the reach of wired networks. In terms of cost, it can save a considerable wiring cost and modification and decoration cost, and basically the space used is much more flexible.
4. Does wireless network affect the human body?
Because the transmission power of wireless networks is much weaker than that of ordinary mobile phones, the transmission power of wireless networks is about 20~70mW, while the transmission power of mobile phones is about 200mW, and the usage method is not like mobile phones that directly contact the human body, so there is no security consideration.
5. To build a wireless network, what are the most basic equipment?
Generally, the basic equipment for setting up a wireless network is a wireless network card and a bridge (AP), so that network resources can be shared in a wireless mode and with the existing wired architecture.
6. Will the use of wireless networks be interfered with or affect the operation of other equipment?
Basically, the frequency band used by wireless networks belongs to the high frequency range of ISM 2.4GHz. The electrical equipment used in daily life, offices, etc. will not interfere with each other. Because there are many frequency differences, and the wireless network itself has 12 channels for adjustment, so there is no need to worry about natural interference.
7. What is the ISM frequency band?
The ISM band is divided into industrial (902-928MHz), scientific research (2.42-2.4835GHz) and medical (5.725-5.850GHz)---the radio band that is not required to be licensed (power cannot exceed 1W) allocated by the US Federal Communications Commission (FCC). Recently (1997.1) approved for use in wireless local area networks (WLANs) is the medical frequency band.
8. What is Spread Spectrum?
Frequency spreading technology is mainly divided into two ways: "frequency hopping technology" and "direct sequence". These two technologies are technologies used by the army in World War II. The purpose is to maintain the stability and confidentiality of communication signals in a harsh war environment. For a non-specific receiver, the jump signal generated by Spread Spectrum is only impulse noise. Therefore, it is a relatively safe communication technology overall.
9. What is frequency hopping (Frequency-Hoping Spread Spectrum)?
Frequency-Hoping Spread Spectrum (FHSS) receives signals at specific types of narrow frequency carriers when synchronous and simultaneous. For a non-specific receiver, the jump signal generated by FHSS is only considered impulse noise. The signals deployed by the FHSS can be specially designed to avoid noise or non-repetitive channels of One-to-Many, and these frequency hopping signals must comply with the FCC requirements, using more than 75 frequency hopping signals, and the maximum time interval (Dwell Time) of frequency hopping to the next frequency is 400ms.
10. What is Direct Sequence Spread Spectrum?
Direct Sequence Spread Spectrum (DSSS) uses more than 10 chips to represent the "1" or "0" bits, so that the original higher power and narrower frequency becomes a low power frequency with a wider frequency. How many chips are used per bit is called Spreading chips. A higher Spreading chips can increase noise interference, while a lower Spreading Ration can increase the number of users. Basically, Spreading Ration is quite small in DSSS, for example, in almost all 2.4GHz wireless LAN products, there are less than 20 Spreading Ration used. In the IEEE 802.11 standard, the Spreading Ration is only 11, but the FCC stipulates that it must be greater than 10, while in the experiment, the best Spreading Ration is about 100.
11. How wide is the coverage of a wireless network?
The scope of the cover that a wireless network can cover in general should depend on whether the environment is open or not. If the external antenna is not added, it is about 250M at the viewing point. If it is a semi-open space and a compartment area, it is about 35~50M. Of course, if the external antenna is added, the distance can be further. This depends on the gain of the antenna itself, so it needs to be planned according to the needs of the customer.
12. What is the confidentiality of wireless networks during use?
Basically, GEMPLEX's wireless network technology adopts a DSSS system, which itself has anti-eavesdropping function. In addition, the dual protection of data encryption function (WEP40bits), so its security is quite comprehensive.
13. What is an Access Point?
Access Point, commonly known as a network bridge, is used as the bridge between traditional wired LAN and wireless LAN. Therefore, any PC equipped with a wireless network card can share resources of wired LAN or even wide area networks through AP. In addition, the AP itself also has the function of network management, which can be used as necessary control management for PCs connected to wireless network cards.
14. How many workstations can Access Point support at the same time?
In theory, it can support a CLASS C, but in order to make the workstation itself have enough bandwidth to utilize, it is generally recommended that an AP support workstations of about 20 to 30 in the best state.
15. What is the Roaming function?
Just like a big brother, you can roam between different base stations, and wireless network workstations can roam between different APs. As long as the ESSID definition of the AP group is the same, the natural wireless network workstations can roam freely in areas that can be covered by radio waves.
16. If wireless network equipment is installed outdoors, how can it prevent lightning strikes?
Basically, the wireless network can be equipped with a lightning arrester device. This device can be optionally installed on a wireless network device to facilitate external sudden waves to cause system damage.
17. What is Access Control?
Basically, each wireless network card has a unique set of hardware addresses, the so-called MAC address. Through the Access Control table, some cards can be defined to log in to this AP. Some cards are denied to log in, so that the control mechanism can be achieved, which can prevent non-related personnel from logging into the network at will and stealing resources.
18. What is ASBF?
ASBF (Automatic Scale Back Functionality), this function is a Gemplex AP unique feature, ensuring that WLAN is always in the best online quality. In addition, it also provides wireless network cards that support multiple manufacturers, but their network cards must be designed in compliance with the IEEE 802.11 specifications.
19. What is Power Management?
Since the Notebook must be charged after about 2 hours of use, if other peripheral devices are used at the same time, it will definitely consume more power. Therefore, this function is to effectively manage the power consumed by the wireless network card. In other words, it can control the timely timely when there is DATA sending or receiving, it is in "Wake up status" and vice versa.
20. Does the length of the feeder used by the antenna affect the transmission quality?
Generally speaking, the length, material, and impedance matching of the feeder used by the antenna will have a certain impact on the signal, and the most obvious one is gain attenuation. Usually, the signal attenuation is about 1.2dBi at a length of 20 feet, and the average attenuation of 8dBi will reduce the original transmission distance by about half. Therefore, the length and quality of the feeder cannot be ignored in the application of wireless products.
21. What is Ad-hoc?
Constitute a special wireless network application mode. A group of computers can be connected to each other and share resources without access point.
22. What is Infrastructure?
An application model that integrates wired and wireless LAN architectures. Through this architecture model, the sharing of network resources can be achieved. This application requires Access Point.
23. What is BSS?
A special application of Ad-hoc LAN, called Basic Service Set (BSS), a group of computers can set the same BSS name to form a group, and this BSS name is the so-called BSSID.
24. What is ESS?
An Infrastructure application, one or more BSSs, can be defined as an Extended Service Set (ESS). Users can roaming and access any information in BSSs on the ESS. Access Points must set the same ESSID and channel to allow roaming.
25. What is SNMP?
"Simple Network Management Protocol" is a network management communication protocol. Through SNMP software, it can be connected to a device that can support SNMP and collect all the information of the device and perform other integrated applications. Gemplex Wireless LAN product has this function.
26. What is WEP?
"Wired Equivalent Protection" is a way to encrypt data. The encryption of WEP 40bits is the standard specification of IEEE 802.11. Through WEP processing, our data can be safer in transmission. Article entry: aaadxmmm Editor: aaadxmmm
To use wireless hotspots, your computer must be equipped with Wi-Fi certified radios, such as external PC cards or integrated wireless LAN connectivity (as provided by Intel and Centimeter mobile computing technology). In addition, you also need to choose a wireless service provider as your ISP, usually providing paid wireless Internet access services with T1speed.
2. What is wireless network?
Generally speaking, as the name suggests, wireless means using radio waves as the transmission of data. In terms of application, it is completely similar to the use of wired networks. The biggest difference between the two is that the medium of transmitting data is different. In addition, because it is wireless, the maneuverability of hardware installation or use is much better than that of wired networks.
3. What are the advantages of wireless networks compared to wired networks?
In terms of use, its mobility and convenience are beyond the reach of wired networks. In terms of cost, it can save a considerable wiring cost and modification and decoration cost, and basically the space used is much more flexible.
4. Does wireless network affect the human body?
Because the transmission power of wireless networks is much weaker than that of ordinary mobile phones, the transmission power of wireless networks is about 20~70mW, while the transmission power of mobile phones is about 200mW, and the usage method is not like mobile phones that directly contact the human body, so there is no security consideration.
5. To build a wireless network, what are the most basic equipment?
Generally, the basic equipment for setting up a wireless network is a wireless network card and a bridge (AP), so that network resources can be shared in a wireless mode and with the existing wired architecture.
6. Will the use of wireless networks be interfered with or affect the operation of other equipment?
Basically, the frequency band used by wireless networks belongs to the high frequency range of ISM 2.4GHz. The electrical equipment used in daily life, offices, etc. will not interfere with each other. Because there are many frequency differences, and the wireless network itself has 12 channels for adjustment, so there is no need to worry about natural interference.
7. What is the ISM frequency band?
The ISM band is divided into industrial (902-928MHz), scientific research (2.42-2.4835GHz) and medical (5.725-5.850GHz)---the radio band that is not required to be licensed (power cannot exceed 1W) allocated by the US Federal Communications Commission (FCC). Recently (1997.1) approved for use in wireless local area networks (WLANs) is the medical frequency band.
8. What is Spread Spectrum?
Frequency spreading technology is mainly divided into two ways: "frequency hopping technology" and "direct sequence". These two technologies are technologies used by the army in World War II. The purpose is to maintain the stability and confidentiality of communication signals in a harsh war environment. For a non-specific receiver, the jump signal generated by Spread Spectrum is only impulse noise. Therefore, it is a relatively safe communication technology overall.
9. What is frequency hopping (Frequency-Hoping Spread Spectrum)?
Frequency-Hoping Spread Spectrum (FHSS) receives signals at specific types of narrow frequency carriers when synchronous and simultaneous. For a non-specific receiver, the jump signal generated by FHSS is only considered impulse noise. The signals deployed by the FHSS can be specially designed to avoid noise or non-repetitive channels of One-to-Many, and these frequency hopping signals must comply with the FCC requirements, using more than 75 frequency hopping signals, and the maximum time interval (Dwell Time) of frequency hopping to the next frequency is 400ms.
10. What is Direct Sequence Spread Spectrum?
Direct Sequence Spread Spectrum (DSSS) uses more than 10 chips to represent the "1" or "0" bits, so that the original higher power and narrower frequency becomes a low power frequency with a wider frequency. How many chips are used per bit is called Spreading chips. A higher Spreading chips can increase noise interference, while a lower Spreading Ration can increase the number of users. Basically, Spreading Ration is quite small in DSSS, for example, in almost all 2.4GHz wireless LAN products, there are less than 20 Spreading Ration used. In the IEEE 802.11 standard, the Spreading Ration is only 11, but the FCC stipulates that it must be greater than 10, while in the experiment, the best Spreading Ration is about 100.
11. How wide is the coverage of a wireless network?
The scope of the cover that a wireless network can cover in general should depend on whether the environment is open or not. If the external antenna is not added, it is about 250M at the viewing point. If it is a semi-open space and a compartment area, it is about 35~50M. Of course, if the external antenna is added, the distance can be further. This depends on the gain of the antenna itself, so it needs to be planned according to the needs of the customer.
12. What is the confidentiality of wireless networks during use?
Basically, GEMPLEX's wireless network technology adopts a DSSS system, which itself has anti-eavesdropping function. In addition, the dual protection of data encryption function (WEP40bits), so its security is quite comprehensive.
13. What is an Access Point?
Access Point, commonly known as a network bridge, is used as the bridge between traditional wired LAN and wireless LAN. Therefore, any PC equipped with a wireless network card can share resources of wired LAN or even wide area networks through AP. In addition, the AP itself also has the function of network management, which can be used as necessary control management for PCs connected to wireless network cards.
14. How many workstations can Access Point support at the same time?
In theory, it can support a CLASS C, but in order to make the workstation itself have enough bandwidth to utilize, it is generally recommended that an AP support workstations of about 20 to 30 in the best state.
15. What is the Roaming function?
Just like a big brother, you can roam between different base stations, and wireless network workstations can roam between different APs. As long as the ESSID definition of the AP group is the same, the natural wireless network workstations can roam freely in areas that can be covered by radio waves.
16. If wireless network equipment is installed outdoors, how can it prevent lightning strikes?
Basically, the wireless network can be equipped with a lightning arrester device. This device can be optionally installed on a wireless network device to facilitate external sudden waves to cause system damage.
17. What is Access Control?
Basically, each wireless network card has a unique set of hardware addresses, the so-called MAC address. Through the Access Control table, some cards can be defined to log in to this AP. Some cards are denied to log in, so that the control mechanism can be achieved, which can prevent non-related personnel from logging into the network at will and stealing resources.
18. What is ASBF?
ASBF (Automatic Scale Back Functionality), this function is a Gemplex AP unique feature, ensuring that WLAN is always in the best online quality. In addition, it also provides wireless network cards that support multiple manufacturers, but their network cards must be designed in compliance with the IEEE 802.11 specifications.
19. What is Power Management?
Since the Notebook must be charged after about 2 hours of use, if other peripheral devices are used at the same time, it will definitely consume more power. Therefore, this function is to effectively manage the power consumed by the wireless network card. In other words, it can control the timely timely when there is DATA sending or receiving, it is in "Wake up status" and vice versa.
20. Does the length of the feeder used by the antenna affect the transmission quality?
Generally speaking, the length, material, and impedance matching of the feeder used by the antenna will have a certain impact on the signal, and the most obvious one is gain attenuation. Usually, the signal attenuation is about 1.2dBi at a length of 20 feet, and the average attenuation of 8dBi will reduce the original transmission distance by about half. Therefore, the length and quality of the feeder cannot be ignored in the application of wireless products.
21. What is Ad-hoc?
Constitute a special wireless network application mode. A group of computers can be connected to each other and share resources without access point.
22. What is Infrastructure?
An application model that integrates wired and wireless LAN architectures. Through this architecture model, the sharing of network resources can be achieved. This application requires Access Point.
23. What is BSS?
A special application of Ad-hoc LAN, called Basic Service Set (BSS), a group of computers can set the same BSS name to form a group, and this BSS name is the so-called BSSID.
24. What is ESS?
An Infrastructure application, one or more BSSs, can be defined as an Extended Service Set (ESS). Users can roaming and access any information in BSSs on the ESS. Access Points must set the same ESSID and channel to allow roaming.
25. What is SNMP?
"Simple Network Management Protocol" is a network management communication protocol. Through SNMP software, it can be connected to a device that can support SNMP and collect all the information of the device and perform other integrated applications. Gemplex Wireless LAN product has this function.
26. What is WEP?
"Wired Equivalent Protection" is a way to encrypt data. The encryption of WEP 40bits is the standard specification of IEEE 802.11. Through WEP processing, our data can be safer in transmission. Article entry: aaadxmmm Editor: aaadxmmm