Q.
A. They all use 802.11.
The difference is that some have 802.11 a, 802.11 b, 802.11 g or 802.11a/b or 802.11 a/b/g.
802.11b and 802.11g standards use the 2.4 GHz (gigahertz) band, operating (in the United States) under Part 15 of the FCC Rules and Regulations. Because of this choice of frequency band, 802.11b and 802.11g equipment will suffer interference from microwave ovens, cordless telephones, Bluetooth devices, baby and security monitors, amateur radio and other appliances using this same band. The 802.11a standard uses a different 5 GHz band, which is clean by comparison. 802.11a devices are not affected by products operating on the 2.4 GHz band.
802.11a is best at home but not all public access point transmits in 802.11a.
The difference is that some have 802.11 a, 802.11 b, 802.11 g or 802.11a/b or 802.11 a/b/g.
802.11b and 802.11g standards use the 2.4 GHz (gigahertz) band, operating (in the United States) under Part 15 of the FCC Rules and Regulations. Because of this choice of frequency band, 802.11b and 802.11g equipment will suffer interference from microwave ovens, cordless telephones, Bluetooth devices, baby and security monitors, amateur radio and other appliances using this same band. The 802.11a standard uses a different 5 GHz band, which is clean by comparison. 802.11a devices are not affected by products operating on the 2.4 GHz band.
802.11a is best at home but not all public access point transmits in 802.11a.
need advice for wireless settings?
Q. at the moment going even 25 feet away from my linksys router my ad hoc qos mode speed goes from 54 to 1 mbps however signal quality is still full. we do have a baby 2.4 ghz baby radio monitor and all our surrounding neighbors signals show up in my wireless network connections at radio type 802.11 ..
Question. would changing my router Ad Hoc Qos and laptop Ad Hoc Qos mode to a different frequency increase my signal quality ..was ready having a lot of wireless signals set to the same value at default 11 can cause interference
Question. would changing my router Ad Hoc Qos and laptop Ad Hoc Qos mode to a different frequency increase my signal quality ..was ready having a lot of wireless signals set to the same value at default 11 can cause interference
A. ofcourse having too many wireless network on the same channel cause interference/conflict change the channel your router is on to he least occupoed band/channel your laptop will use the same band autoatically when connected to router.. you can use free app like inssider to check out all channels..
I have lap top with wireless network, how to make signal strength: excellent ... help me ....?
Q. I already secure the network but it still I just have signal strength : low .... anybody know what happenned ???
A. Assuming your software is reporting the signal strength correctly, there are several possibilities. However, if your data rate is high (typically, about 1/2 of the max quoted rate is the best you can hope for), there's not much to worry about. Both 802.11 g and n automatically back off to slower modulation choices if the error rate is high enough. Among other reasons, error rates are high when signal strength is low. Other reasons for low signal strength include (in no particular order):
1) distance from the other end of the link. Like all electromagnetic transmission, it decreases as the quare of the distance. Every radio has a lower limit for the least signal it can manage. A directional antenna, properly deployed, will likely help with this problem.
2) problems with the antenna. If the antenna (or cables, or connectors, or ...) are not properly built or installed, lots of signal will be lost, perhaps enought to reduce the signal strength below what's workable.
3) wrong antenna orientation. If you have a directional antenna, it might be pointed in the wrong direction. If so, the signal you see will be a lot less than it might be. Antennas in laptops are often built into the lid, and reorienting the laptop might help. Or you might be outside the strongest lobe of the signal strength pattern broadcast by the other antenna. Move the lap top. Note that this issue applies even in unexpected ways. Omindirectional antenna signal strength patterns are typically doughnut shaped and have very little signal above or below the antenna. Communication between a windo on the third floor and your laptop on the lawn will be quite difficult with the usual orientations.
4) poor sensitivity in your radio. Radios vary a good bit in sensitivity, and you might be using a low sensitivity unit. Check the specifications for your unit, or perhaps try another WiFi unit (perhaps a USB connected one) to see.
5) poor orientation of your antenna re polarization. All electromagentic radiation is polarized, including WiFi. Most WiFi antennas are vertically polarized, and if so, your antenna should be oriented so as to be vertically polarized as well. But not all are, and in any case reflection can change the polarization of the signal you're receiving. Some experimentation is sensible if you have low signal strength and suspect polarity mismatch. NB: polarity has nothign to so with antenna directivity, and must be adjusted for separately.
6) obstructions. 2.4GHz signals are readily absorbed by all sorts of things, including tree leaves, air, water, ... If there's too much of <whatever> between the two antennas, your signal strength will be considerably reduced. 802.11 b, g,and n all operate at the 2.4GHz ISM frequency range. 802.11a operates at 5GHz and is even more easily obstructed. It shouldn't be counted on to have much range beyond a room.
7) interference will act to reduce the usable signal level. Lots of things use the 2.4GHz Idustrial/Scientific/Medical frequency band; baby monitors, leaky microwave ovens, wireless Web cameras, cordless phones, ... If their signal is strong enough, your radio will see a high noise floor and will probably report a low signal strength. Established connections between other 802.11 b/g/n radios on adjacent channels will also cause interference trouble. Working channels overlap significantly, so though there are nominally 11 channels in the US and Canada, there are actually only 3 (or 4 sometimes) simultaneously usable channels. 802.11a is much better in this respect, though there are also many other devices using the 5GHz frequency band as well. If you can, change channels.
Some antennas are 'diversity antennas' meaning that there are two (or more, I suppose) separate antennas, separated by at least a few inches. The radio examines the signal from both, and picks the strongest one. In a multipath (ie, reflected signals) environment, this can increase performance because one antenna may be seeing a slightly different signal (ie, stronger) than the other.
Note: network security (eg, WEP or WPA1 or 2, or even 802.11i) has nothing to do with signal strength. Security is concerned with data protection, signal strength is a radio reception issue, regardless of the modulation type or data content of the signal. But, some security settings have the effect of slowing down the data rate, as the processing overhead is substantial. On a slow processor, the effect will be worse, while on a fast processor, it may be negligible.
1) distance from the other end of the link. Like all electromagnetic transmission, it decreases as the quare of the distance. Every radio has a lower limit for the least signal it can manage. A directional antenna, properly deployed, will likely help with this problem.
2) problems with the antenna. If the antenna (or cables, or connectors, or ...) are not properly built or installed, lots of signal will be lost, perhaps enought to reduce the signal strength below what's workable.
3) wrong antenna orientation. If you have a directional antenna, it might be pointed in the wrong direction. If so, the signal you see will be a lot less than it might be. Antennas in laptops are often built into the lid, and reorienting the laptop might help. Or you might be outside the strongest lobe of the signal strength pattern broadcast by the other antenna. Move the lap top. Note that this issue applies even in unexpected ways. Omindirectional antenna signal strength patterns are typically doughnut shaped and have very little signal above or below the antenna. Communication between a windo on the third floor and your laptop on the lawn will be quite difficult with the usual orientations.
4) poor sensitivity in your radio. Radios vary a good bit in sensitivity, and you might be using a low sensitivity unit. Check the specifications for your unit, or perhaps try another WiFi unit (perhaps a USB connected one) to see.
5) poor orientation of your antenna re polarization. All electromagentic radiation is polarized, including WiFi. Most WiFi antennas are vertically polarized, and if so, your antenna should be oriented so as to be vertically polarized as well. But not all are, and in any case reflection can change the polarization of the signal you're receiving. Some experimentation is sensible if you have low signal strength and suspect polarity mismatch. NB: polarity has nothign to so with antenna directivity, and must be adjusted for separately.
6) obstructions. 2.4GHz signals are readily absorbed by all sorts of things, including tree leaves, air, water, ... If there's too much of <whatever> between the two antennas, your signal strength will be considerably reduced. 802.11 b, g,and n all operate at the 2.4GHz ISM frequency range. 802.11a operates at 5GHz and is even more easily obstructed. It shouldn't be counted on to have much range beyond a room.
7) interference will act to reduce the usable signal level. Lots of things use the 2.4GHz Idustrial/Scientific/Medical frequency band; baby monitors, leaky microwave ovens, wireless Web cameras, cordless phones, ... If their signal is strong enough, your radio will see a high noise floor and will probably report a low signal strength. Established connections between other 802.11 b/g/n radios on adjacent channels will also cause interference trouble. Working channels overlap significantly, so though there are nominally 11 channels in the US and Canada, there are actually only 3 (or 4 sometimes) simultaneously usable channels. 802.11a is much better in this respect, though there are also many other devices using the 5GHz frequency band as well. If you can, change channels.
Some antennas are 'diversity antennas' meaning that there are two (or more, I suppose) separate antennas, separated by at least a few inches. The radio examines the signal from both, and picks the strongest one. In a multipath (ie, reflected signals) environment, this can increase performance because one antenna may be seeing a slightly different signal (ie, stronger) than the other.
Note: network security (eg, WEP or WPA1 or 2, or even 802.11i) has nothing to do with signal strength. Security is concerned with data protection, signal strength is a radio reception issue, regardless of the modulation type or data content of the signal. But, some security settings have the effect of slowing down the data rate, as the processing overhead is substantial. On a slow processor, the effect will be worse, while on a fast processor, it may be negligible.
Laptop Help Please!!!?
Q. I'm about to buy a Sony Vaio laptop, which costs £499. The specification is as follows:
- Intel Core Duo T2310 Processor
-15.4" Widescreen
- Double layer DVD/ - RW drive
- 2048MB / 2GB hard drive memory
- Intel Graphics Media Accelerator X3100
- Wireless LAN 802.11 a/b/g
- Vista
Is this a good offer? I'm afraid that the processor might be weak but I can't distinguish a good one from a bad one since they're all given names like T3287642JFi etc. Thank You.
No way, the T2310 has the smallest processing power within the Pentium core-duo family :( Is there really a big difference between 1.46 and 1.60?
Here is the model:
http://www.comet.co.uk/cometbrowse/product.do?sku=420158&tab=specification
- Intel Core Duo T2310 Processor
-15.4" Widescreen
- Double layer DVD/ - RW drive
- 2048MB / 2GB hard drive memory
- Intel Graphics Media Accelerator X3100
- Wireless LAN 802.11 a/b/g
- Vista
Is this a good offer? I'm afraid that the processor might be weak but I can't distinguish a good one from a bad one since they're all given names like T3287642JFi etc. Thank You.
No way, the T2310 has the smallest processing power within the Pentium core-duo family :( Is there really a big difference between 1.46 and 1.60?
Here is the model:
http://www.comet.co.uk/cometbrowse/product.do?sku=420158&tab=specification
A. well a laptop at 15.1 inch monitor would not be a good candidate for playing smashing video RPG's so I guess you would use this for document work. The Intel made video graphics card works just fine for your apps.
If you are a gamer you would probably have a bigger screen or connect this baby laptop to another monitor, which I would guess a serious gamer does not really do.
So back to your question...
The processor is an old one, maybe you want a Core 2 Duo, not the Core Duo. In any case the Core DUO would be cheaper but would run hotter and slower than Core 2 Duo. How slow, well maybe not noticeable per your application, if you would use it for documents work anyways and emailing and some internet. The pipe bottleneck would be more on your internet connection.
For Sony they concentrate on user experience and business road warriors, their laptops are generally light and has good power. Though I prefer Toshiba... but that's just me. Or now the pearl white iBook. Apple is also using Intel processors.
cheers
If you are a gamer you would probably have a bigger screen or connect this baby laptop to another monitor, which I would guess a serious gamer does not really do.
So back to your question...
The processor is an old one, maybe you want a Core 2 Duo, not the Core Duo. In any case the Core DUO would be cheaper but would run hotter and slower than Core 2 Duo. How slow, well maybe not noticeable per your application, if you would use it for documents work anyways and emailing and some internet. The pipe bottleneck would be more on your internet connection.
For Sony they concentrate on user experience and business road warriors, their laptops are generally light and has good power. Though I prefer Toshiba... but that's just me. Or now the pearl white iBook. Apple is also using Intel processors.
cheers
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