Routers dual band ?

can anyone explain dual band...

is it just the G  Vs   N    for the dual band.... or is it something else>?
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Craig BeckConnect With a Mentor Commented:
802.11a is 5GHz and will use 802.11n to increase throughput and range.
802.11b/g is 2.4GHz and will also use 802.11n to increase throughput and range.

Actually, 802.11a and 802.11b were created at the same time as part of the 802.11 standard in 1997 (although technically speaking 802.11b was actually developed first).  802.11a was not widely used as the costs were more expensive than 802.11b, and therefore 11b became more popular because of this.

The 802.11 standard was originally 2Mbps, but the a and b standards superseded the original standard quite quickly (1999).

Cisco 1250 APs will do both 20MHz and 40MHz-wide channels at 2.4GHz when running older versions of IOS, although that is the only model which supports this and only in Autonomous mode.  Any WLC or Lightweight AP will now only allow 40MHz-wide channel allocations on the 5GHz band.  However, as other people have said, it's not really a good idea to implement 40MHz-wide channels when using 2.4GHz.
Dave HayzenHead of I.C.T.Commented:
Dual band means that the router is capable of using either 802.11g or 802.11n bands.
Some routers will allow for both to be used at the same time.
Kruno DžoićConnect With a Mentor System EngineerCommented:
no, dual band is:

In Wi-Fi wireless networking, dual band is the capability to transmit on the 5 GHz band of 802.11a and also the 2.4 GHz band used by 802.11b/g/n.
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intelogentAuthor Commented:
so this has nothing to do with A  Vs G or N  

can my wirelss nic     listen to both bands...?    is any preferable if my laptop does get both?
Kruno DžoićSystem EngineerCommented:
5 GHz band of 802.11a  - A standard
2.4 GHz band used by 802.11b/g/n - B/G/N standard

I use 5GHz to connect two routers and 2.4GHz  to connect clients ( wireless in laptops, desktops... )

The latest wireless standard - 802.11 "N" uses both the 2.4 GHz and 5 GHz wireless bands to provide up to 300 Mb/sec data transfer. If your laptop have nic capable to connect on N standard that is not the same as 5GHz A standard

Please be aware - 300 Mb/sec is the MAX that wireless N is capable of. You results WILL vary, and will almost always be less
Darr247Connect With a Mentor Commented:
802.11n can run on either 5GHz and/or 2.4GHz.
So if it's an 802.11n dual band, then it can run
5GHz - 802.11a/n
2.4GHz - 802.11b/g/n

Another way you might see it put is 802.11a/b/g/n

Note that some units can use only 1 radio or the other, so if it doesn't SAY "simultaneous" dual band, then the single band (or "selectable") usage is probably the case.

Those access points can run on either 2.4GHz or 5GHz, but not both at the same time.

While that one can use both 2.4GHz and 5GHz radios simultaneously.

Why was this posted in the Microsoft Word topic area, by the way?
intelogentAuthor Commented:
first off.... i appreciate your trying to get me on the path to understanding...

but if i have it right...
"A" is the oldest... and ran on  5 ghz originally ,   that frequency will now also run  N
2.40 ghz     runs    b/g/n
> "A" is the oldest... and ran on  5 ghz originally

Yes, 802.11a was the first public WiFi standard, and it still runs on 5GHz @ 54Mbps.

802.11b was next, and had about 5x the range of 11a with the same isotrpic power, but had a top speed of only 11Mbps.

Then came 802.11g which has the longer range of 11b with the higher speed of 11a.

802.11n can run on both the 2.4GHz and 5GHz bands... its range is about double the range of 11g, and speeds are up to 6x 11a and 11g when using wide channels (40MHz width instead of 22MHz) and multiple antennae (MIMO Diversity).

Note that Apple, Cisco and Intel do not support wide channels in the 2.4GHz band, though Linksys, Netgear, Belkin, et al do... there are usually only 3 non-overlapping channels in the 2.4GHz band, so when a wide channel is used, it takes up 2 of those and leaves only a single channel for legacy (11b/11g) devices to use.
e.g. Channel Overlap in 2.4GHz band
intelogentAuthor Commented:
i am a facinated by the answer... and right on point for what i am looking for....

i am going to award you the points.... but i am really interested in what is the correct choice for me...

please see      
"what router now "

i just posted it
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