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.

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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.

HP Color LaserJet 1500L - drops off the 802.11n network

My HP Color LaserJet 1500L drops off the network (it just stops printing). This happens when it is plugged into the usb bus of my new 802.11n base station or directly into the usb bus of a computer. The only way to fix it seems to be to plug it directly into a computer and unplug the usb plug and replug it, or to add the printer again. This problem has occurred in the past, but over time, and after various upgrades to the operating systems and hardware, etc, the situation tends to change. Before I installed the 802.11n base station the printer was staying in contact with my computers, but now it is misbehaving again. I doubt there is a real solution out there now, because it happened before and I never did discover a direct fix, but I thought the problem to be worth posting. This problem does not happen with my Canon PhotoPrinter iP6000S, which sticks to my network like glue whereever I plug it in (airport express, airport extreme, direct to computer, etc.) The HP loses contact with either of my computers in exactly the same way.
Mac Pro Intel Core 2 Duo, and iMac Intel Core Duo Mac OS X (10.4.8) airport express, airport extreme 802.11n, cable modem
iMac Intel Core Duo Mac OS X (10.4.8)

To use the OS X standard network protocols (Windows/IP printing), you must have either a postscript printer (the driver in that case is just a ppd for the OS X postscript output) OR, a driver designed to work with CUPS (CUPS driver). HP doesn't provide CUPS drivers for OS X (who knows why, since they do for linux).
You need to install foomatic and ESP ghostscript:
http://www.linuxprinting.org/macosx/foomatic/
then, install the foo2oak driver:
http://www.linuxprinting.org/showprinter.cgi?recnum=HP-Color_LaserJet1500

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.

Where can I buy the 802.11n updater?

I want to buy the 802.11n updater. I'm at work on my PC and can't find a URL on Apple's website for it. I just want to put it on my usbkey disk and take it home to my mac.
How can I buy this update? Surely it directs you to a webpage.

I found it by searching in the store for the 802.11n enabler.
Try this url for your self - http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/6064003/wo/jw5Cg OTRI0pz2wMO2GGMPxSaNqD/2.0.21.1.0.8.25.7.11.0.3

Airport Extreme - Only the 802.11n only (5 ghz) works

Airport Extreme - Only the 802.11n only (5 ghz) works
Posted: Sep 21, 2008 2:50 AM Reply Email
I just bought an new Airport extreme Base station, and i am not very good with network settings. I am experience an weird problem.
I follow the instruction to set up the Airport extreme. I get the green light on the extreme, everything went well up to that point. but then when i try to connect to the internet wirlessly, it won't let me.
The weird thing is... the computers that were connecting wirely to the Airport extreme using ethernet works fine. but my macbook pro and along with other labtops are not being able to connect to the internet. On my macbook pro, it first says connection failed after i put in my password. but after couple try on entering the password( i thought i typed it in wrong), it finally connected to the network but still no internet. then I went to the network preference panel to check, it says i am connected but with a self-assigned IP and may not be able to connect to the internet.
The even worse thing is... if i change my airport extreme to only broadcast the 802.11n only (5 GHZ) mode, everything works fine. But of course I have some device in the house are not N compatible, which makes this "solution" pretty useless. I understand n is faster and all, but I still want my G compatible device to work with my network.
It will be really nice if anyone can give me a solution and help me get the 802.11n (a/b/g compatible) works.
Thank you.

I am having the exact same issue with my Macbooks. I have 2 Macbooks and they've all stopped connecting to the Airport Extreme router via wireless N. Yeah, I can switch to 5ghz mode, but then my PC laptop, iPod Touch, wireless printer, Xbox 360 wifi adapter and Nintendo Wii all can't connect as they all use wireless a/b/g.
BRUTAL. When are we going to get a fix for this? How do I roll back to a previous rev of OSX, if that's the issue (it must be, as this recently stopped working - i.e. when I installed the latest OS update - when it has worked fine for months).
Message was edited by: Adrian Crook

Question: why the 802.11n doesn't work on my brand new MacBook?

dear sirs,
I've just found out that the 802.11n upgrade doesn't work for my MacBook 2 GHz Intel Core Duo. How come? Is it possible? What should I do to have it talk to my also new AirPort Extreme 802.11n at the same rate?
Thanks in advance for your help.
Tomaso

Also on http://www.apple.com/airportextreme/performance.html it states:Most currently shipping Mac systems support the next-generation 802.11n technology in the new AirPort Extreme Base Station.2
2. All Mac computers with Intel Core 2 Duo and Intel Xeon processors except the 17-inch iMac with 1.83GHz Intel Core 2 Duo processor support the 802.11n technology in AirPort Extreme. These 802.11n-compatible Mac systems require enabler software that is included on the AirPort Extreme CD.

Is the 802.11n 1st generation a dual band router?

Is the 802.11n 1st generation a dual band router?

Yes, but not simultaneously I think. If you look at the tech specs (http://support.apple.com/specs/#airport) for the Airport Extreme, the 1st and 2nd generation all say "2.4GHz or 5GHz" while the 3rd generation and up say "2.4GHz and 5GHz simultaneously".

Where is the 802.11n Enabler??

I can't seem to find the 802.11n Enabler for $2 on Apple's store.. how can I find this?

It's there. Here is the link.

AirPlay speakers...where's the 802.11n??

So I'm in the market to get some whole home audio going in my house. I've researched all of the various methods to do so (wired + receiver, airport express + speaker + amp, airplay speakers, bluetooth, etc) and I think I'm going to settle on getting AirPlay speakers. I just don't want to mess with wiring everything up and doing the AirPort Express thing....plus AirPlay speakers are actually cheaper than doing anything else. Granted you don't get the flexibility, but it's still a better budget decision.
In looking for some good AirPlay speakers, the only budget options ($150 or so) are Phillips and iHome. I've found both on eBay for around $80 a pop depeding on the version. Anyway....what's the deal with the AirPlay speakers only having 802.11b/g? I was getting ready to pull the trigger, but now I'm thinking I won't because of 802.11n becoming the standard and b/g will be going out the window soon. My wifi router supports the legacy frequencies, but I don't want to buy speakers and then in 2 years they are obsolete. I know I know, go with the airport express route. Well I'm open to suggestions at this point, but I'm just curious as to why the speaker manufacturer's are bundling b/g into their NEW products?

I had a similar concern: an airplay speaker only support 11g, not 11n. I did some study and made my move and hopefully it helps by sharing what I did.
Study:
The major chip inside airplay speakers comes from one single vendor: SMSC (lately got bought by Microchip). It offers 11b/g and not 11n. No firm schedule on 11n, it takes time to make a speaker from a chip
Most 11n routers support 11b/g too. So playing music to 11g airplay speakers shall not be a problem; but it will affect your internet speed as some old routers will downgrade to 11g (which is 54Mbps, not too bad).
The new 11ac routers with multi-bands (2x2 or 3x3) can be a solution to this with ability to have separate channel for 11g airplay and other channel for 11ac internet browsing.
My Purchase:
I did not buy any airplay speaker as it is over $100 my budget. Instead, I bought Yamaha PDX-60 dongle speaker which uses propietery RF technology which happened on sale at Amazon at that time. I did a check at Amazon store as I write and they are gone already. (relief: as I do not want to be sounded like sales :-)
Hope it helps//

Is the 802.11n download compatable with my Mac Book Pro?

I have a Mac Book Pro with a core duo processor. I was wondering if I could purchas the $2.00 download and make my computer 802.11n compatable. I dont know if I need to get anything new, say a different airport card, or if I can just download the "new" software.

You'd need a new Airport card or ExpressCard for 802.11n. But if you just want it for Internet, don't bother, only for local file transfer, e.g. Time Capsule.
http://www.quickertek.com

Two computers accessing the 802.11n Basestation - problems . . .

While trying to get my base station to allow me to "see" my new HD, I kept messing with the settings in the base station set-up. I am NOT a networking specialist by far . . .
Anyway, I now have access to the disk, but anytime one of our other computers tries to access the network for internet access, it immediately slows down the other one - or knocks the other one off. Some kind of DHCP error comes up on my wife's PB G4.
It is not an issue of the flavor of 802.11 - both machines (Macbook core duo, and Powerbook G4) are 802.11g machines.
Both accessed the connection fine, with no problems a week ago.
I will add that I recently had to replace the HD in the Powerbook, but everything seems fine otherwise.
When one of the computers only is accessing, everything is fine.
Any ideas?

Unfortunately that hasn't worked. The g card is working fine, but the n cant go online when the g is online. They both are recognized and accepted by the airport station, but it will only let the g online if they are both logged on at the same time.

WRT310N + MacBook Pro = slow as 802.11g performance on the 802.11n band?

I have a Macbook Pro and recently bought a WRT310N router. I used own a WRT54GS and finally decided to go N and Gigabit. The 2nd part has been good but the N part is really sucking right now.
I've read numerous reviews about how this router gives great performance even in Mixed Mode, often hitting over 90mbps:
http://reviews.cnet.com/routers/linksys-wrt310n-wireless-n/4505-3319_7-32815483.html
http://www.digitgeek.com/linksys-wrt310n-router/
Neither review mentions the wireless card in their test machines, which is a bit suspect. I've not been able to get over around 18mbps which has what my old 54GS was giving me. I've tried Windows XP and OSX on this machine with latest drivers, turned the router to N-only mode, wide band, etc and still suffers from slow speeds.
Any thoughts on how to improve performance to something near what the reviews are claiming?

Hey try resetting the router reset button in such a way that power
light is blinking on the router & then do a complete network power
cycle i.e., unplug the power cables from the modem & from the router &
then plug in the power cable to the modem first once all the lights are
solid green you could plug in the power cable to the router & check out
it will definately work!!
Open the setup page of router using 192.168.1.1 then put in the
password as admin...all you need to do is do the wireless settings such
as Radio Band Frequency to Standard 20 MHZ frequency,channel to 11.
Also,the advanced wireless settings to Beacon Interval=50,Frag
thres=2306 & Rts thres=2307 & then uncheck a Block Anonymous Internet
Requests & it will definately work!!!
Also, make sure that you are doing the Security mode as WPA as it works great with the WRT300N router & will get good connection & speed.

Can't find Range Extender after installing firmware upgrade to fix the 802.11n bug

I got my RE1000 shortly after Christmas but had trouble after a while where devices would claim they were connected to my wifi network but not really have a connection.
I discovered by doing a network scan that my router was broacasting/accepting B/G/N... all of my devices support N, so they were connecting on N... but the RE1000 wasn't broadcasting/accepting N... only G.
Since the RE was on G, this caused major issues trying to connect.
So in late Jan / early Feb I updated the firmware on the device as per instructions from the Cisco rep... but didn't have a chance to plug it back in and test until now.
Now when I plug it in, it lights up all solid green... but in the setup (Windows 7 / PC) the setup can't find the device. My laptop and the RE are within 25 feet of the router... and the laptop and RE are about 6-10 feet apart (I tested different distances to ensure it wasn't too close)
So now I'm stuck... I can't even verify if the RE1000 is properly updated.
What can I do or do I need to return this unit?

scunliffe,
What is the model number of your router? Is it a Linksys device too? You can configure the RE1000 manually, you will have to connect your laptop straight to the RE1000 via ethernet cable and access its setup page by typing 192.168.1.1 on your browser.
Check this link: http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=76055e8973f5487f82d2d3f610da4c02_Accessing_the_web...
Title: Accessing the web-based setup page of the Linksys range extender
Article ID: 24379
Scenario 1 is applicable for you: Using a wired computer.
You may need to disable the WiFi capability on your laptop while doing this to make sure that it is not connected wirelessly to any network. You may need to have both the RE1000 and the laptop at least 6-10 feet away from your router.
I would say you are fmiliar with the wireless settings on your router, right? You will need those information to configure the RE1000 (SSID, Channel Width, Security Mode, and Passphrase).
For the steps, check this link: http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=bc79b0ee350f404d82f231d729bc9530_Manually_Configur...
Title: Manually configuring the wireless security settings of the Linksys RE1000
Article ID: 24344

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

The 802.11n standard

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