Setting up a Dual Band (2.4 GHz and 5 GHz) Network

My setup:
cable modem, 2 gigabyte switch, N router, G router (non apple).
I would like to set a separated band network to prevent the slow down of my N network by G users.
I have read the recent DesigningAirPortExtreme802.11nNetworks.pdf apple released which is helpful but leaves some ambiguity for me as far as the design is concerned.
I would appreciate some advice on the fllowing questions:
1. should I daisy chain the routers followed by the switch or hang both routers from the switch (along with other wired devices).
2. should I leave each router to serve it's own DHCP or should I have only one DHCP server on the whole network.
3. if each device manages its own DHCP should they have different masks.
Being self taught, these questions may reveal some underlying misunderstanding of a networking principles, please correct me if needed.
Thanks
--Ami

Thank you Duane, I think you answered my most important questions.
There is a discussion in the Apple publication on WDS that suggest the following is possible (under the WDS tab of the base station software). My design however is somewhat different.
With a design of cable modem to switch, both routers hard wired to the switch, one has DHCP diabled, the other serves the network. Limit the N router to transmit only in the 5G band to prevent G user from connecting to it. (I hope it makes sense without a drawing)
Is it possible to register the two router MACs under one router, so they appear as a single network with one ssid/password? making it simple for users to connect and automatically default to the right frequency connection?
It would be easier to leave it as two separate SSIDs but not as elegant.
--Ami

Similar Messages

How to set-up a DUAL BAND wireless network.

Lots of people are reporting problems caused by replacing an existing wireless network with the new Airport Extreme 802.11n base station.
* Xbox360 compatibility.
* Airtunes issues
* 802.11n slowed down by 802.11g devices
One workaround is to set-up a dual-band network. Your old 802.11g base station looks after the older "g" devices. And the new Airport Extreme looks after the 802.11n devices.
There are a number of benefits to this solution.
* Everything that did work, carries on working. No reconfiguring needed.
* Everything works at its fastest possible speed. You can use the full 270Mb 5Ghz band for n devices.
* 802.11g traffic does not interfere with 802.11n traffic at all.
* It's easy to set up.
The downside is
* There are two boxes. I want one.
This is the diagram (again)
Note that in this configuration, the new Airport Extreme base station is set-up in Bridging Mode.
Glyn

I've done some testing and here are my findings:
- 2 Computers, 1 C2D N enabled and iMac G only in 2 diff rooms
- 2 AX to stream music
- Transfer of a 446 Mb avi file from Airdisk to C2D
- 2 Wifi Networks: 1) G only from a Netopia 2) Depending from settings from AE(n), Both Base Station are placed aside. When G network is available both AX are connected.
- With or No airtunes means a stream to the 2 AX from iMac while transferring the 446 Mb file to the C2D.
446 MB / AE(n) 5 Ghz N / No Airtunes / Netopia Off / 2:47
446 MB / AE(n) 2.4 Ghz N Only / Auto Ch / No Airtunes / Netopia Off / 2:13
446 MB / AE(n) 5 Ghz N / No Airtunes / Netopia On / 3:14
446 MB / AE(n) 5 Ghz N / With Airtunes / Netopia On / 3:20
446 MB / AE(n) 2.4 Ghz N Only / Auto Ch/ No Airtunes / Netopia On / 2:29
446 MB / AE(n) 2.4 Ghz N Only / Auto Ch / With Airt / Netopia On / Unusable
446 MB / AE(n) 2.4 Ghz Mixed / Auto Ch / No Airtunes / Netopia Off / 2:17
446 MB / AE(n) 2.4 Ghz Mixed / Auto Ch / With Airtunes / Netopia Off / 3:03
Here are the findings:
- Without any G network (meaning no Airtunes possible) the 2.4 Ghz N Only performs much better than the 5 Ghz N
- While streaming Music the 2.4 Ghz Mixed performs better then the 5 Ghz N (Dual Band Network)!
These are my findings with my settings, it could be different, but I'm pretty sure you will find the same behavior on your side. And BTW, the theoretical thru-put means nothing, only real life usage testing is worth something. So on my side I'm going for a single mixed network.
Hope this sheds light for some of you.
Micha

I have both a simultaneous dual band and a regular dual band airport extreme on an extended network will the 5ghz work at its full potential if its the one that is extending the network?

I have a A1143 model Airport extreme with dual band capabilities but not simultaneous, i'd like that to run on the 2.4ghz band, while i have a A1408 model airport extreme as the "extender" but i want to make sure that even though im running the 2.4 and the newer model is extendeding it, my simulataneous dual band will still work to its full potential (ie: 300mbs i think is the max for the 5ghz)..?
notes: no i can't use the newer model as the primary and the older model as the extender.

I am assuming that your simultaneously dual-band Extreme is using the same Network Name for both radios. If that is the case, and depending on the distance between AirPorts, the extending Extreme is most likely just extending the 2.4 GHz radio. That would leave the 5 GHz wireless network basically "untouched."

Dual band wireless 2.4 and 5 ghz not supported

well first off i cant believe this 2013 model that cost 800.00 doesn't support both radio 2.4 ghz frequency and 5.0 frequency for media. i bought a dual band router that creates 2 networks one for email and internet and the other for media. i dont know what to do because it will not get the download speed i buy 200mbps. only about 100mbps. The wireless network adapter and wireless frequency of 5.0 needs to be installed in this computer. I am so frustrated with all the media out there and technology dual band routers have been around for 5 years or so. so why did hp neglect to incorporate what the routers aare doing. I have my 2 smart tvs, blueray player, cell phone, and laptop part of only one network that does not include video. and i am supposed to have a working nertwork. thats a joke and a big problem thanks to hp. does anyone know what i need to do to this pc to get the 5.0ghz band frequency come out of this computer and i guess i need a new wireless network adapter that accommodates both frequencies. but heres the problem everything is housed in the monitor because it is an all in one. at least the old towers you could open and get a picture of what was inside the tower and what was available to add to to the empty spaces or slots. i am not going to be able to open this up and install a chip for the network adapter and hardware to send and receive a 5.0 frequency and all the channels that go with it. any advice

ii appreciate your reply but routers started wireless connections using dual band about 5 years ago andd if its so cheap to get then hp should have the technology as well. the computer manufacturers know about this technology long before it actually comes out so probably about 2008 hp already knew about thee dual band wifi connection and they probably were instrumental in getting the 5.0 frequency because it supports media and has not been used as much as 2.4ghz. they just didnt want to spend the money or time to install the necessary hardware and software to keep the frequencies from conflicting and screwing up the channels putting out the data and video. that would involve additional software and hardware to keep static and channel conflicts from causing data and video interference. I will contact hp and ask when will they have the dual frequency wifi hardware adapters and software available on there computers and can i get it installed in this one

Adding new dual band AEBS-initial setup question--join network or setup new

Upon the initial setup of a new dual band AEBS, do I join my current network or setup a new network?
I bought this just so I can set up a separate 5GHz band to force my newer computers to a faster network. I know that the 5GHz band needs it's own new network name. I am just wondering how to do it at the very beginning after I plug it in. I want the 2.4GHz band to connect on the network I already have, and the 5GHz band to be a new name.
Thanks!

Looks like Bob has already given you the correct steps. In addition to his comments, I would like to offer the following suggestions:
o Before trying to configure either base station to extend your new DB AEBSn, I would strongly suggest that you perform a "hard" reset on the AEBSn & a "factory default" reset on the AXn.
o Place the base stations within near proximity of each other during the set up phase, and then relocate them to their desired locations when complete. To make it even simpler and avoid having to "switch" wireless networks during the setup, attach each to the DB AEBSn via Ethernet.
o Remember each base station will only be able to extend one of the DB AEBSn's radios so try to select the appropriate base station for the job.
o I would recommend the following radio mode combination for your DB AEBS: 802.11n only (5 GHz) - 802.11b/g/n. This will prevent any 'stray' 802.11a wireless clients from connecting to the 5 GHz network and affecting its overall bandwidth performance.

Best way to add new dual band Extreme to existing b/g network

I've been using a Snow Extreme and b/g Express, but have recently been having dropped/slow connection issues. I think this may be at least partially caused from the many other networks and other wireless devices in the neighborhood - I can see 30 or more networks at times. I've also gotten a new Mini and MacBook, both with n wireless, so I decided to get a new dual band Extreme.
The faster connection speed of the new Extreme is very noticeable on my n capable machines. It also looks like the connection issues I was previously having may have been resolved, but its a bit early to tell for sure.
First problem I've had is with setting up the guest network. If I attempt to set it up wirelessly, I get as far as changing the settings and restarting the Extreme. Once I do, it does restart, but then Airport Utility is not able to find it after restart. I am able to see the main and guest network in my available networks, but I am unable to join either. Once I turn guest off (via ethernet since Utility isn't able to see it wirelessly) I am again able to see it in Utility and connect to the main network. If I try to turn on guest via ethernet, I get an error and it does not restart.
Originally the Snow Extreme was the main and the Express was used for wireless printing. My plan was to use the new dual-band as the main, move the Snow to the printer, and use the Express for AirTunes. But now I realize that I'm only able to print and use Airtunes on the main and not the guest network. Since the Snow and Express are b/g, are they going to slow down the main network? I am seeing these as clients in Airport Utility, which I didn't expect. If so, is there a better way to set this up than what I am attempting to do?
I've got the radio mode set to 802.11n only (5GHz) - 802.11b/g/n. Am I able to set it up so that the n capable clients use the 5GHz band and the b/g clients use the 2.4GHz band so that they don't slow down the n connection, or would I even want to do this?
Thanks!!!

The jre is 14,872 KB (j2re-1_4_2_03-windows-i586-p.exe).
If you silently install the JRE then then licensing doesn't appear to be an issue (no dialogs appear). See http://java.sun.com/j2se/1.4.2/docs/guide/plugin/developer_guide/silent.html. Silent installation is perfect for us since our customers are very nontechnical and would be very confused about the JRE installation dialogs.
My main question remains: what is the best way to incorporate the installation of the JRE into an existing product. I solved the above-mentioned error 1500 problem by asynchronously starting the silent JRE installation after my product is installed, i.e., after the InstallFinalize step. This results in a bad human interface: the user is prompted with the final dialog with a "finish" button. However the mouse cursor is showing an hourglass intermittenly (kind of like when you logon to Windows after a reboot), for 25-40 seconds after this dialog first appears, until the JRE is installed. I have got to figure out a way to synchronously install the JRE while the user waits.
I chose to do a private install (search for "private" in http://java.sun.com/j2se/1.4/pdf/plugin-dev-guide-1.4.2.pdf), which works, but I haven't yet figured out the best way to uninstall this JRE -- it appears that simply deleting the directory tree might be the correct way to uninstall.
I have searched a lot of newsgroups for the "generally accepted" method to incorporate some Java programs into a product (i.e., how to install the JRE). I have not found anything. My conclusion is that I must be doing something that isn't done that often, either that or I've taken a wrong turn.

Qosmio x770-136 Dual band wifi 2.4 and 5ghz - how to switch between them?

Hi Guys,
getting a new router netgear dual band N900, and it supports multi 2.4-5ghz wifi,
my question is how to i set my qosmio up at 5ghz?
thanks for any replies

Hi
Found this details on Intel page:
http://www.intel.com/content/www/us/en/wireless-products/wifi-link-5100-brief.html
It seems that Intel 5100 WLan card supports 802.11 A/B/G and N so it will operates at 2.4GHz and 5.0GHz.
The Wlan card is also available in miniPCIe format so it should be possible to insert this into the WLan slot on the mobo.but question is if the BIOS would supports this
To be honest I dont know there are no info about that and according to some users here in the forum, it could be possible that notebook would not power up using new WLan card.

How do I set up a dual boot with 10.8 and 10.7

I want to set u a dual boot system using so10.8 and os 10.7 I have my disk for 10.7 and 10.8 is curently my os. I have an empety hard drive partition I want to install 10.7 on to but when I try to start up my computer with the instalation disk it gives me the "this computer needs to restart please push and hold your power button" message. Can any one help?
Thank you
Mike

How to create an OS X Lion installation disc
OS X Lion Install to Different Drive
Your system (OS) selection of where has to be done BEFORE any restart.
And you want to backup and retain a copy of the installer ".ESD" package first.
On restart it will self destruct the package.
A clean install on another drive or another partition.
I prefer to go with pulling the old drive.
Always retain backup boot ability and dual drive dual boot is just... safer.
If you're looking for an OSX installation disc, and, like me, you upgraded to Lion through the app store, you will have to go through a back-door process in order to create this disc. Here's an article on this. http://www.macworld.com/article/161069/2011/07/make_a_bootable_lion_installer.ht ml (I can't guarantee it works. I made a disc like this because I thought I needed it to reload from a Time Machine backup, but it turns out that Lion doesn't require the disc for this, so I never used it.)
When I installed Boot Camp and Windows, I didn't need the OSX installation disc. I'm not sure why you would, in this process. It should only ask for your Windows disc.
If for some reason you downloaded Windows from Microsoft instead of buying a package with a disc, you need to download the ISO version and burn it to a DVD. See this article on downloading the ISO: http://www.mydigitallife.info/windows-7-iso-x86-and-x64-official-direct-download -links-ultimate-professional-and-home-premium/ (Make sure you choose the ISO that matches the version you bought).
Here's instructions on burning an ISO with Disk Utility: http://lifehacker.com/251758/mac-tip--how-to-burn-an-iso-or-dmg-file-to-disc And this thread on burning a Windows DVD in OSX: https://discussions.apple.com/thread/2039118?start=0&tstart=0 (Summary: you can use Disk Utility to burn the ISO, but choose a slow burn speed)

How to set up AEBS dual band as single network?

As I have it now, when I open Network Prefs and click on Advanced, I see two networks listed: my 5GHz network and presumably, my 2.4GHz nbetwork. The problem is that although I've listed my 5GHz network as my preferred network, it continually chooses the 2.4GHz network? Or that is what I see when I cherck my wi-ifi status in my menu bar. I'm not sure why that is, but I've read that if I create a single network, my AEBS will automatically choose the appropriate network? If this is so, I'ds like to eliminate ther 2.4GHz network.

so I thought if I was able to merge both bands, then I could eliminate this happening?
You cannot "merge" both bands....they will always be separate signals....but you can assign the same wireless network name to both bands. That is the default setup for the AEBS, and the setting that most users should use.
Your Mac will connect to either the 2.4 GHz or 5 GHz band automatically.
Your Mac will connect to the band that it thinks is the best quality.
Best "quality" does not necessarily mean the faster speed band. The Mac is looking for the best combination of speed, signal strength, low noise, interference and other things that Apple engineers won't tell us about.
Try removing the check mark in the box next to 5 GHz network name in AirPort Utility and test things out. You may find them better, or worse.

How do I set up a dual display with my macbook and an iMac?

Hi all,
I have a macbook and an aluminum iMac. Is it possible to set up the iMac as an external monitor? If so what cable will I need, because I read that I would need a mini DVI to standard DVI adapter but it does not seem to fit into the ports.
Thanks a lot

Not directly, because the port on the iMac is for video-out only (ie, adding a second monitor to the iMac), it's not for sharing the iMac's screen out to another computer.
However, there is a nice software solution available with ScreenRecycler.
Matt

Unable to set up a dual boot for Snow Leopard and Lion

I'm running an early 2011 MacBook Pro. I originally ran this machine with Snow leopard for quite a while. I've got 8 GB RAM and lots of free space on my hard drive. I upgraded to Lion and it works well. But I want to boot to Snow Leopard from an external drive to run some old Rosetta apps. However, I couldn't run the Snow Leopard installation disk on the Lion Machine. When I tried to boot to the installation disk, I would get a beeping sound during startup, three beeps in a row - repeating, and it would not boot. So I connected the external to another machine running Snow Leopard and I installed a new version of Snow Leopard on the external drive. But my Lion machine will not boot from that external. I am able to select the Snow Leopard drive in the Start Up Disk pane in the prefs. But when I restart, I just get the three beeps. I must be missing something here. Any help would be appreciated.

Not in cases when the computer successfully boots to one OS but produces three beeps when an attempt is made to boot it to another. If it really was a RAM problem that serious, the computer wouldn't get as far as checking the OS version, and it has no problems booting Lion. In the event of a minor RAM problem, it wouldn't produce three beeps like that at all.
(67955)

Setting up/extending a Dual Band network

Any recommendations regarding dual-band vs. the n/b/g blended network? Is it possible to set up a dual-band network on an AEBS-n and also boost the "n" side of the network with an AX-n? I've searched the discussions but have not found much on the topic, other than some comments regarding iMacs not liking "n" or 10.5.3 or airport utility 5.3.1 or maybe the "automatic" channel setting or possibly something else.....
A little history:
We have 3 iMacs (new 3.06 Ghz, 17" late 2006, 20" late 2006), 3 MacBook Pros, and one dual-2.5 Ghz G5 that all shared internet access through a Motorola modem/Comcast cable via an Airport Extreme Base Station b/g. The AEBS was in the basement and configured as a WDS with an Airport Express b/g that served to extend the network's reach to the second floor and remodeled kitchen (new steel beams). This setup has worked nearly flawlessly for years until recently, when both of the older iMacs started experiencing intermittent airport signal drops--supremely annoying. The modem seemed to work fine, however, and the AEBS light stayed green and the G5 and MBPs weren't having issues (some running Tiger, some Leopard).
I thought that upgrading to Leopard (erase and install) might take are of any weird settings or corrupt files and thus improve the iMacs' airport connections, so I upgraded the first one, and it seemed to fix the problem--no drops of airport or internet for several hours. I then decided it was time to upgrade the network as well--swapping out the old b/g AEBS and AX for a new AEBS-n and AX-n. (Yes, I know, not too smart to change both the OS and the network at the same time ... but here we are.) Since the G5 in the basement can't connect to an "n" network, I decided to set up a Dual Band network with the AX-n acting as the old AX b/g had to extend the network.
This is what it looked like:
cable modem ------>
AEBS-n ------> wireless to Airport Extreme-n ---> wireless to older iMacs and MBPs
AX b/g (connected via ethernet to AEBS) -----> wireless to the G5
This worked, sort of, in that all but the G5 could all pick up and join either the "n" or the b/g network. Problem was, the network was very unstable-- the airport signal would suddenly drop out for no reason then recover, or the airport icon would show a full 4 bars but have no internet connection. This was happening on all of the macs, perhaps more so on the two older iMacs, while the modem itself showed no change in status, and the AEBS-n light would remain green. When I removed the AX-N from the setup to see if that was causing a hiccup, the drops were a little less frequent but the kitchen iMac was marooned with 1, maybe 2 bars in the airport icon and the signal strength on the second floor was decreased. Oh, and the drops continued to happen. I've now reverted to a b/g-compatible network, which is better, but still hasn't prevented all of the drops.
My questions are:
1-Any ideas about why the airport is acting wonky? Are 'n' networks proving to be more problematic than the old ones?
2-Is it possible to use an AX-n to extend the range of the "n" side of a dual band network?
2-If so, any ideas for improving the network's reliability?
3-If not, will going back to a b/g-compatible network negate the supposed speed benefits of 802.11n? Would I go back to using a WDS setup then?
I've tried so many different settings, combinations, configurations trying to get this up and working, that I'm ready to pull my hair out. Any help will be greatly appreciated!
Message was edited by: wiswic

Thanks for your reply. Looking back at my sorry attempt at a diagram, I realize I wasn't clear about a couple of things. The modem is connected via ethernet to the AEBS-n. The AEBS-n is connected via ethernet to the AE-b/g, which provides wireless coverage to the G5 and others. So far, everything is in the basement.
We live in an old house--no way to set up the network via ethernet--and so rely on the airport network to provide internet access to the computers on the first and second floors. In our old network, I had an AE-b/g as a WDS remote located in the kitchen that provided the first and second floors with their internet connection.
When I upgraded our network, I set up the new AEBS-n as a 5.0 Ghz an-only network (create a network/allow network to be extended) and connected the old AE b/g to it (bridge mode/create a network) to provide wireless internet for the G5. The iMac in the kitchen could hardly pick up the "n" signal at all, and it could receive only a weak signal from the b/g network. Lots of dropped airport signals and also lots of dropped internet connections. Strangely enough, the MacBookPros on the second floor could pick up both signals pretty strongly, but they, too, had lots of drops. The 2nd floor iMac was even worse than the kitchen iMac--spotty reception at best, and lots of drops. The G5 and the iMac in the basement, meanwhile, were fine--strong signal and only intermittent drops.
Hoping to extend the reach of the "n" network and thereby eliminate the drops, I added an AE-n to it (bridge mode/extend the network) and put it where the old b/g had been. This boosted the "n" signal to the kitchen and 2nd floor, but the drops seemed to become more frequent and for longer durations. Perhaps this was merely coincidence, but it made me question whether adding the AE-n in a dual-band network was advisable. Not finding any info that specifically addressed that scenario, I turned to the discussion forum for guidance.
Further research leads me to believe that the iMacs' issues may be more due to their being iMacs in the first place, but I was still left with a very unreliable dual band network for the rest of the Macs. Reconfiguring the AEBS-n and AE-n as an n (b/g compatible) network has led to far fewer drops, but like you, I'd prefer to keep my "an" devices separated from the G5 to make use of their higher wireless speed.
So....I guess what I need to know is whether anyone else been having so many dual band dropouts? Have you had any success in eliminating them? Have you successfully extended the "n" side of their dual band without adversely affecting stability?
As long as I know this isn't a lost cause, I'll give it another go and keep tweaking settings in hopes of finding a stable setup....

Looking for dual-band option in Time Capsule

I read with great interest the on-line article in Macworld that described the improvements with this week's AirPort updates because I run two access points in tandem: An old Linksys 802.11g device for my "legacy" systems, and an Apple Time Casule (configured to 802.11n at 5 GHz) for my newer systems. So I immediately updated the AirPort software in my 5-month old Time Capsule and the AirPort utility on my Mac so I can use the Time Capsule in dual-band (simultaneous 2.4 and 5GHz) mode so I can simplify my network and honorably retire the Linksys.
To my surprise, I find that, after updating, there is no difference in the configuration options for my Time Capsule; I seem to be limited to EITHER 2.4 GHz or 5 GHz operation. Is there a setting that I'm just not seeing?
If anyone could shed some light, or provide a "how to guide," I would be most grateful.
Thank you.
Message was edited by: Steve Davidson

Sorry, Simultaneous Dual-Band is an option available only to the new hardware (SKU MB763LL, 764LL,765LL).

Optimising Dual Band on Airport Extreme

Hi,
I have just bought an airport extreme and can't understand what advantage there is to differentiate the dual band frequencies i.e. having two separate 2.4 GHz and 5GHz networks.
Given that 5GHz generally has better speed and 2.4GHz generally has better range I want my devices to preferentially communicate on the 5GHz channels but automatically switch to the 2.4GHz channel when it is advantageous, or (if possible) exploit data transfer from both channels simultaneously?!!
What would happen if I set up both channels to have the same SSID and password?
Can I add preference to my network settings on my iPad (if I have both channels running independently)?
Thanks,
Matthew

What would happen if I set up both channels to have the same SSID and password?
This is the default setup, and recommended for most users.
In this case, wireless devices will automatically connect to the best quality signal based on their capabilities and distance in relation to the AirPort Extreme.
Can I add preference to my network settings on my iPad (if I have both channels running independently)?
The iPad connects at such a slow speed.....generally about 60-65 Mbps.....that it does not really matter whether it connects to the 2.4 GHz or 5 GHz band.
If you set both bands up using the same SSID, the iPad......like other devices.....will automatically choose the best quality signal.
Isn't that really what you want?

Dual Band Network Advantage?

I am considering setting up a dual band network because my neighborhood is very crowded with wireless networks. There are four other networks within range of my house. We are all on different channels, but, looking at Spectrum (a part of iStumbler) I see that all the networks overlap in the 2.4 GHz range.
I have several iMacs and Macbooks and iBooks and iPod Touches and a TiVo. Some use G, some are capable of N.
Would it help me to set up a dual band network so the devices capable of N can use 5 GHz and be on a separate frequency from the majority of the networks in the neighborhood?
If a dual band is the way to go, can I get a new Airport extreme and set it up as dual band and have an 5 GHz network made up of Airport Extreme and Airport Express Base Stations capable of 5GHz and seperate network of devices that can use 2.4 GHz wireless G?
Thanks,
Andy

AndyD wrote:
Would it help me to set up a dual band network so the devices capable of N can use 5 GHz and be on a separate frequency from the majority of the networks in the neighborhood?
That would certainly get your 11n-capable devices off the 2.4GHz bands.
If a dual band is the way to go, can I get a new Airport extreme and set it up as dual band and have an 5 GHz network made up of Airport Extreme and Airport Express Base Stations capable of 5GHz and seperate network of devices that can use 2.4 GHz wireless G?
The new AirPort Extreme has two radios, so it can provide service in both bands simultaneously. If you already have an older 11n Extreme and at least one Express, you could set that on 5GHz 11n-only mode, and use an Express set in 2.4GHz b/g compatible mode, bridged, plugged into one of the Extreme's LAN ports.

Setting up a Dual Band (2.4 GHz and 5 GHz) Network

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