802.11n standard bandwidth.

Hi,
I am reading things about the 802.11n standard, but I have some things that I do not understand very well.
So, can someone tell me what the maximum bandwidth in the 802.11n standard is?
That bandwidth is dependent, if I used a 20MHz or 40Mhz channel?
What is the role and how that as to do with the bandwidth?
The maximum bandwidth that I can have is 300MHz or can be more, for example, 400MHz or even more?
The 802.11b/a/g standards, the transmissions of data are wall made in half-duplex.
In 802.11n standard, the transmissions of data are wall made in full-duplex? Is MIMO something to do with this?
Thanks in advance,
Rui Capao

First point you are getting your MHz and Mbps muddled but no worries
Max bandwidth for 802.11n is 600Mbps this is with 4 spacial streams using 64QAM and a guard interval of 400nS and 40MHz channels (channel bonding)
Thats the absolute maximum in the standard however I am not aware of anyone doing that at the presentr time.
Cisco maximum is 150Mbps on 2.4GHz and 300Mbps on 5.0GHz. This is because its at least impractical to channel bond 2.4GHz due to channel interference but you can on 5.0GHZ.
Each data rate is given an MCS (modulation coding scheme)index value.
The data rate can vary also by the guard interval which has two options of 800 or 400ns. If we take Cisco max of MCS 15 the vlues are
20MHz channel 800ns GI 130Mbps
20Mhz channel 400ns GI 144Mbps
40MHz channel 800ns GI 270Mbps
40Mhz channel 400ns GI 300Mbps
Smaller guard interval more bandwidth. Also if you double the channel width you get slightly more throughput than simply doubling the data rate as the bit where the two channels join is used more efficiently.
802.11n is not full duples its just alot more efficient than 802.11a/b/g its still a collision domain that uses csma/ca.

Similar Messages

The 802.11n standard

I need to extend the range of my wifi. How can I tell if my 2011 iMac supports the 802.11n standard that Airport requires?

Check  (Apple menu) > About This Mac > More Info.. > System Report
The above is your model iMac.

Official 802.11n standard?

Hi!
Is it possible to upgrade the existing Airport Extreme unit to the official 802.11n version when it's released? Or are we forced to use this Pre-N release in the future as well?
Thanks in advance

I would say there are a lot of depends here.
First, if you are talking about the new 802.11n as the Pre-N release since there is no official 802.11n Standard yet, depends on whether or not the existing 802.11n Extreme meets the final specs of the Standard.
If the final specs require a change in hardware, the answer to your question is probably no. Apple will probably try to get around it with programming. Also, any hardware change would probably cost as much as buying a new AEBS.
Second, if the change requires only firmware update, the answer is probably yes.
And, third, if you are talking about upgrading an 802.11g Extreme to an 802.11n Extreme - the answer will probably be most definitely no.
Lastly, if you are concerned about buying the current 802.11n and then Apple coming out with another one that is upgraded both hardware and firmware wise - welcome to the world of Apple. Apple seldom retrofits. So if that is a big concern to you don't buy an AEBS until the final spec comes out.

How can I make by MB Pro work on 802.11n wireless?

A month ago we bought a new MacBook and in conjunction with that purchase we upgraded from a Linksys 802.11g to the AirPort Extreme 802.11n Wi-Fi Wireless Base Station. We wanted to have the 802.11n access for the new MacBook and for our other laptop (mine) - a MacBook Pro 1.83 GHz Intel Core Duo 15" purchased in March 2006.
I just figured there would be some downloadable upgrade to take my MacBook Pro from 802.11g to 802.11n ... but that does not appear to be the case. (Boy, do I feel stupid.)
So - the question: What do i need to do to get my MacBook Pro to work fully on the 802.11n standard? Do I need something new physically installed in the laptop? Is there a downloadable upgrade or something on the CD that came with the Airport Extreme unit that I can install? Help!
I really hope I didn't buy a $200 router that I can never fully utilize - there has to be some way to upgrade from a/b/g to a/b/g/n, right?
Thanks to any and all who can provide guidance on this.
MacBook Pro 1.83 GHz Intel Core Duo Mac OS X (10.4.10) puchased in March 2006

Thanks for the tip on the upgrade. I upgraded to Airport Utility 5.1 (I had 5.0) and then did the firmware upgrade at the link you provided. So, all is installed, and I restarted the MB Pro, but my Network Utility still shows that I have only 802.11 a/b/g capability.
Do I need to take other steps? Do I need to anything like turn my cable modem or Airport Extreme unit on or off or something like that?
I am really frustrated and confused on this. Is it possible that my MB Pro that is all of 15 months old can't upgrade to 802.11n? I know that the new Inel Core 2 Duo MB Pros have the 802.11n built in. My MB Pro is the older Intel Core Duo (not "Core 2 Duo").
Anyone else have ideas? Thanks!
MacBook Pro 1.83 GHz Intel Core Duo Mac OS X (10.4.10) puchased in March 2006

ASK THE EXPERTS - Update on 802.11n with Fred Niehaus

Welcome to the Cisco Support Community Ask the Expert conversation. This is an opportunity to get an update on 802.11n with Cisco expert Fred Niehaus. Fred is a Technical Marketing Engineer for the Wireless Networking Business Unit at Cisco, where he is responsible for developing and marketing enterprise wireless solutions using Cisco Aironet and Airespace wireless LAN products. In addition to his participation in major deployments, Fred has served as technical editor for several Cisco Press books including the "Cisco 802.11 Wireless Networking Reference Guide" and "The Business Case for Enterprise-Class Wireless LANs." Prior to joining Cisco with the acquisition of Aironet, Fred was a support engineer for Telxon Corporation, supporting some of the very first wireless implementations for major corporate customers. Fred has been in the data communications and networking industry for more than 20 years and holds a Radio Amateur (Ham) License "N8CPI."
Remember to use the rating system to let Fred know if you have received an adequate response.
Fred might not be able to answer each question due to the volume expected during this event. Remember that you can continue the conversation on the Other Mobility Subjects discussion forum shortly after the event. This event lasts through March 25, 2011. Visit this forum often to view responses to your questions and the questions of other community members.

So there are two parts of this question, the latter part I cannot address as it is a future question. Cisco does not comment on products that have not been released or on the strategy of next generation products.
That said, Cisco was first to market with an 802.11n Access Point and well (we didn't all go on vacation after we did that)
So let's talk a little about spatial streams in general and how it relates to what customers are doing today.
The Cisco 1040, 1140, 1250, 1260 and 3500 Series Access Points are all two spatial streams (2SS).
As of the time of this writing, a critical mass of 3SS and 4SS compatible clients have yet to be deployed, and the vast majority of WiFi clients that will be deployed over the next 18 months will be 1SS and 2SS clients.
The higher SS clients are likely only show up in some higher end notebooks -- Why? well it is a given that smartphones and tablets are likely to continue to be 1SS and in some rare cases 2SS.
This is because additional radios used in this technology consume battery life, add to the physical size of the device and increase the cost. Also many devices leverage the same single antenna for cellular as well as WiFi. Therefore, it is my opinion that 3SS Access Points provide little if any performance benefit for smartphones or tablets in the enterprise today, and any real throughput gain is likely to occur with high end notebooks in close proximity to the Access Point and those are rolling out very slowly and we are monitoring this.
Now we get to my favorite part of this.. I get to ask myself a question and then answer it..
So Fred are you saying that there is no value in 3SS and 4SS?
Of course not, 3SS performs similar to 2SS beyond a short distance, and with any multi-SS product RF interference must be addressed to capture the performance benefits of higher SS Access Points. Actual throughput in any WiFi environment is highly dependent on the presence of interferers and obstacles.
Without the ability to mitigate the impact of interference, 3SS solutions will "downshift" to 2SS of 1SS and lose all the performance benefits anyway IMHO.
I don't want to sound like a commercial, but you really do need Cisco cleanair technology in the AP and Cisco innovations deliver more and will go beyond the simple 3SS aspects of the 802.11n standard.
IMHO it's more about CleanAir, good RF system design, and what we put into the AP with regard to performance "in the environment" and not what is on some spec sheet today.
For more on Cisco CleanAir see the following URL http://www.cisco.com/en/US/netsol/ns1070/index.html
Fred

Do my Airport Express just buy are with 802.11n?

I using imac 2.4 GHz model 2008 which understand that it build in with airport extream 802.11n standard, isn't it?
Also just buy Airport express but doubt that this AX is on which 802.11n or not?
Because it shown only 802.11 a/b/g.
And since I found software for airport 802.11n available for 1.99 US$, Do I need to install this software to be able to run 802.11n?
Thank in advance.

No, special software isn't needed. You have AirPort Utility already installed on your iMac and it is located under Applications/Utilities. Run AirPort Utility and go to Wireless and make sure you have an 802.11n mode selected (whether it is 802.11n only or 802.11n with b/g compatibility enabled).

802.11N in Aironet?s Products

Hello Everybody
I?m already designing a Unified Wireless Solution for a customer... but my customer tell me that cabletron solution work with 802.11N standard. I was wondering why Aironet?s products doesn?t work with 802.11N
I found that Linksys already works with 802.11N... but do you know good arguments to avoid this standard on Cisco Aironet?

Hi, 802.11n it not yet official. Any product on the market are pre-draft and nothing guaranty they are compatible with each other.
According to the IEEE 802.11 Working Group Project Timelines, the estimated 802.11n publish date is now May 2009.
As for Cisco, they usually release a product a few month after the standard is out. The might release a product 802.11n upgradeable before may2009 like they did for 802.11G.

Upgrade to 802.11n??

So I have decided to get a new Airport Extreme but... I have an old iBook G4. Is there any possibility of upgrading it to the new 802.11n standard? Really not hugely fussed if I can or not but i would like to give it a try.

So I have a macBook Intel Core Duo, with Airport Extreme -- but while it can see the new airport extreme network, I can't resolve any web addresses. The same connection serves the web fine to my macbook pro core 2. Is there no way to serve n-style connections to computers that can deal with it and the slower speed to those that can't, if indeed this is the problem I am having with the macbook? Pretty insane that this machine, not even a year old, can see the wireless signal but can't use it?

WRT54GX4 upgrade to 802.11n

Since both the SRX 400 routers and the 802.11n routers are MIMO based, has any thought been given to offering firmware upgrades to the new 802.11n standard for customers with the WRTGX4 and the PCI Card SRX 400? I've invested a lot of money in these systems.
Thanks,
Jeff Rollins

hi....MIMO is a technology used by both the srx and n router...while the wireless standards are different for both of them.....wrt54gx4 works on wireless-g standard and n routers work on wireless - n standard......so i don't think that it is possible to upgrade the devices with different standards....

Airport Express 802.11n - speed, throughput, bandwidth problems only 1MB/s

Hi there,
I got a brand new Airport Express with 802.11n. But I'm really disappointed with the speed in a draft-n-only environment.
Before I used as a router my 54Mbit/s Linksys WRT54GL with DD-WRT v23, which gave me on its g-Standard network a throughput of 3 MB/s when copying something via finder to my Ubuntu server.
But with the new AE I got only 1 MB/s as transfer rate for the same job. I tried already various configuration setups, but nothing helped. It seems to me if there is a bandwidth limitation thing in the AE.
Can someone help me to find the reason for my problem or give me some advice after what I have to look at?
Many Thanks,
Jan.

Welcome to the discussions, Tiggar!
A few suggestions from here, where my AirPort Express far outperforms my older "g" router.
1) Try to position the AirPort Express as high as possible and away from any other electronic gear. The general design of the product unfortunately encourages users to position the device low on a wall, often behind a desk and close to other electronic devices that sometimes can interfere with the wireless signal. Use an extension cable to get the Express up high and give it as much free air as you can.
2) You need to remember that higher frequency "n" signals...although faster...do not penetrate walls and other obstructions as well as lower frequency "g" signals. Try to establish a line of sight situation between your computer and the Express if possible and mimimize obstructions in the signal path.
3) Your Linksys may have been using a different wireless channel than the Express. Try different channel settings on the Express to see if you can find a good channel that is free of interference. To do this, open AirPort Utility, click Manual Setup and click the Wireless tab below the row of icons to get to the Wireless settings page.
4) Turn off any cordless phones that you may have there for an hour or so to see if you notice any improvement in performance. If you do, try to position the cordless phone as far away as possible from the AirPort Express.
Let us know if things improve when you can.

High Definition - is 802.11N Draft standard fast enough for streaming?

My understanding, from what I've read, is that 802.11n draft standard is actually only running at 50% speed of the actual final 802.11n protocol that will be out in a couple of years.
If Itunes starts selling HD content or I import an HD-DVD or Blu-Ray disc to Itunes, is the 802.11n fast enough to be able to stream this content to Apple tv? Has anyone tried this?
Thanks!

My understanding, from what I've read, is that
802.11n draft standard is actually only running at
50% speed of the actual final 802.11n protocol that
will be out in a couple of years.
No. No idea where you got that idea. Right now the Wi-Fi alliance is "certifying" 801.11n Draft 2.0 devices. It is called "draft" simply because it won't be formally approved until 2008, given the normal standardization schedules. Between draft and approved final there may be changes, but they are usually minor, so much so that sometimes a firmware update may do the job.
If Itunes starts selling HD content or I import an
HD-DVD or Blu-Ray disc to Itunes, is the 802.11n fast
enough to be able to stream this content to Apple tv?
Has anyone tried this?
First of all, don't expect iTunes to provide HD-DVD or Blue-Ray format files any times soon (I mean expect years before you see that). These are 1080p formats, which are NOT supported by the Apple TV. Apple TV does support content with a maximum resolution of 1280 by 720 pixels at 24 fps, which can be considered "720p" HD content, though not at the full cable frame rate.
Yes, Apple TV can stream this content. I have converted several HD programs captured from ESPN (which broadcasts in 720p), converted them to H.264 at 1280x720x24fps using MPEGStreamClip (http://www.squared5.com/) and stream them to my AppleTV.
You can find several samples here:
http://hdonappletv.webhop.net/

802.11n 5GHz no longer works on one Macbook

Good evening,
Our household has two Macs connected to an Airport Extreme 802.11n (July 2007), both are MacBooks (Late 2006). For well over a year, both have happily connected to the AE using 802.11n 5GHz. A few weeks ago, however, my wife's Macbook stopped connecting. I've tried a number of things (reconfiguring, restarts, reinstalling the last combo updates, etc.) and the only thing that appears to work is dropping the AE to 2.4GHz (I still keep it at 802.11n-only). My Macbook continues to be able to connect just fine at 5GHz, when I enable that on the AE.
Considering that this drops our available bandwidth from 300Mbps to 130Mbps, I'm not a happy camper, but I'm also tapped out of ideas. I can only guess that there's a hardware malfunction on my wife's Macbook. Her Applecare doesn't expire until 2010, so I may just take it in ...
Any ideas? One note: my wife is still clinging to Tiger, while I'm on Leopard ... in case that matters.
Thanks,
Brice

Not that I can tell. Suspiciously, we did run a salvo of updates from Software Update and the problems started immediately after, but none of those appeared to be directly related to Airport functionality (firmware or otherwise). Just to be sure, I took the "safe" steps of repairing permissions, re-downloading the last combo update & re-applying it. I also searched for any firmware updates related to Airport. What's odd to me is that the firmware reported on her machine is different than that on mine. They're both Late 2006 Macbook models, so that strikes me as odd (but maybe it isn't). I wasn't able to find any updates that her Macbook was lacking, however.
My (working) firmware is: [type] AirPort Extreme (0x168C, 0x87), [version] 1.4.8.0
Her (not-working) firmware is: [type] AirPort Extreme (0x168C, 0x87), [version] 1.4.4
Based on the card type, it doesn't appear that they're different chipsets, so I'm not at all clear on why the firmware versions differ. Was there a firmware update for Leopard that wasn't available/needed for Tiger?
Also, I know for sure that there were no firmware updates performed during the last set of updates ... that's a more involved process, if I recall, not handled through the standard updater, I think.
Thanks for the response!

802.11n AirPort Extreme and Express

Hello,
Thank you in advance for all your help and replies, I truly appreciate it.
I'm looking to purchase an 802.11n Airport Extreme and AirPort Express. I want to setup the Extreme next to my DSL modem and setup the Express in another room and have it extend the wireless network. The Express will also serve as an ethernet port from my DVR unit. I have read different posts that indicated that if I setup the Express to wirelessly connect to the Extreme, via WDS, or some other method, the wireless network will be downgraded to 802.11g. I currently have a 802.11g wireless network. I have one Buffalo Technology 802.11g wireless router and one Buffalo Technology 802.11g router (setup as an access point) and can do everything I need except connect a external HD via USB.
If at all possible, I would like the entire network (Extreme and Express) to use the same SSID and password. Have the Extreme perform the MAC filtering, provide DHCP address, and service a guest network.
So, do I understand what I have read correctly, that connecting an 802.11n Extreme and 802.11n Express via wireless (WDS, or other method) will downgrade the network to 802.11g? Are there any other recommendations on how I should connect these two devices and provide 802.11n service?
Again, thank you in advance.
--GMReed

When using the "extend" feature with the new 802.11n base stations, the extended wireless network operates in the 802.11n mode. I believe you may be referring to one of two things that may have led you to that conclusion: 1) When extending a network with the older static version of a WDS, the extended network operates in the 802.11g mode. This is true when either or both base stations are 802.11g models, and 2) Non-"n" wireless clients, connected to a "n" network, will bring the network down to the lowest bandwidth level of the oldest standard. Although connecting these types of clients does affect the overall bandwidth available to "n" clients, it does NOT bring the overall wireless network down to "g" or "b" level.
>If at all possible, I would like the entire network (Extreme and Express) to use the same SSID and password.
By default, both base stations must uses the same Network Name or SSID and wireless password to work properly.
>Have the Extreme perform the MAC filtering, provide DHCP address, and service a guest network.
For MAC filtering in an extended network, both base stations must be configured with the same MAC addresses for all clients that you want access to the extended network. The Extreme would provide DHCP service, but (unfortunately) you cannot extend the guest network.

AirPort Extreme 802.11n and PowerBooks?

I am about 1.5 seconds away from buying one of the new AirPort Extreme 802.11n base stations to work with my AirPort Express but I have some questions / concerns.
1) Is my Powerbook capable of being enabled to access an "n based network" or is my money wasted on a router capable of speeds my computer can not access?
2) Should my computer be capable of accessing this network, is the Airport Express Base Station I have capable of acting on this network in "N speed" too? I know the base station can be configured to act essentially as a relay to boost signal strength...if set up to do so will it dumb the speed down to "G speed"?
3) If 1 and 2 are true and the express base station dumbs the speed of the N router down, can I configure the airport express base station to ONLY act as a wireless conection to my stereo and not as a wireless router, so as to allow my Powerbook to access the "N" speed network but still broadcast my music wirelessly to the stereo?
Many thanks...I wish they just made this information clearer on pages like this:
http://store.apple.com/1-800-MY-APPLE/WebObjects/EducationIndividualCanadaCustom .woa/9804006/wa/PSLID?mco=F7D93AEF&nplm=D4141ZM/A&wosid=gE4h0LIBbghZ2sXpLP21Wij0 uPJ

Hey for any one still lookin....
1. It all depends on what your CARD is capable of. Your POWERBOOK is more then capable of "N" speeds. Your only limited on the bandwidth of the Cardbus slot. You would have to have a third party card to access the new "N" speeds tho. I'm not sure if the last batch of (pre MacBooks) Powerbooks even made it to the "G" standard. I know Apple just came out with a driver for the latest Macs that have an upgradeable Card and or Basestation to get to "N". I really don't think your Express is upgradeable.
2. You need to look at what models you have to figure out what their capable of. You should be able to go to Apple's web site to find out. Usually the Router will Dumb it down to the SLOWEST speed. Unless you were streaming your music, and playing a game online, and transferring a large file you shouldn't have a problem anyway. As long as you are not using the slowest product it won't dumb down.
3. Haven't got that far yet. I've used up all my brain cells getting this far, so good luck on your mission. Try starting another string with specifics on what you want to do.

New Macbook Air will not connect to 802.11n, but my old 2011 model will

I have just bought a new MBA 13", i7, 8 GB RAM, 256 GB SSD.
When I connect to my home network I see it as a 802.11n network, but as soon as I log on, I only have 802.11g connection. I still have my old 2011 MBA, and it connects to the n-standard just fine.
I went to the local Apple reseller to have them look at it, but the problem was not present when connecting to their airport extremes.
Has anyone else had this kind of problem, and is there a known fix?
Casper

The warranty entitles you to complimentary phone support for the first 90 days of ownership. If you bought the product in the U.S. directly from Apple (not from a reseller), you also have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different.

802.11n standard bandwidth.

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