My new Airport Extreme 802.11n causes my PPC G5 to crash. Anyone else had this issue?, My new Airport Extreme 802.11n causes my PPC G5 to crash. Anyone else had this issue?

My new Airport Extreme 802.11n causes my PPC G5 to crash. Anyone else had this issue?

Any solutions? I just got my 5th generation Airport Extreme, set it up on my MacBook (OS X.5.8), and my PPC iMac (OSX.4.9) is having Kernal panic attacks whenever I try & join the new network. I;m now back on my old Airport settings and it doesn;t crash. Clearly it's the new Airport.

Similar Messages

I have an 2tb time capsule 802.11n Wi-Fi base station can I use this as an external hard drive and use a new airport extreme 802.11ac Wi-Fi for my wifi?

I have an 2tb time capsule 802.11n Wi-Fi base station can I use this as an external hard drive and use a new airport extreme 802.11ac Wi-Fi for my wifi?

You can use the 2 TB Time Capsule as a network drive. That means that it must connect to one of the Ethernet LAN <--> ports on the new AirPort Extreme, or connect to the network using wireless.

Speed or Performance Issue with Airport Extreme 802.11n

Background:
Router 1: Linksys Wireless G 2.4GHz Router WRT54G (have been using for 1.5 years)
Router 2: Airport Extreme 802.11n Base Station Model: A1143 (just arrived)
Macs: Intel MacBook Pro & MacBook both Newtwork Adapters upgraded to 802.11 a/b/g/n and verified via "Netwrok Utility". The Netwrok Utility also displays the link speed at 54 mb under interface info. when the Linksys G router is selected and the link speed at 144 mb when the airport extreme n is selected.
Observation & Issue:
Currently, for testing both network routers have been used seperatly (connected directly via the cable modem) and speeds for each latop verified via http://www.speakeasy.net/speedtest/ and normal "human" usage web surfing observations via Safari. Results below:
1. When using the Linksys G router both the MacBook and MacBook Pro appear to be performing well and responsive with little or no wait on graphically/media intense sites such as apple.com
The speakeast.net/speedtest/ (using the NYC hub close by) downoad test displays 8MB to 10MB speeds
2. On the otherhand, when using the Airpot extreme both the MacBook and MacBook Pro appear to be performing slower than usual with higher waits for image and page downloads.
In addition, the speakeast.net/speedtest/ (using the NYC hub close by) downoad test displays 2MB to 3MB speeds. Lower than what we experienced using the older router.
Request for advide or help:
1) Is this normal? Assuming it is not, what esle can I look at that can help me determine the root cause. The Airport Utility does not offer much assistance in this matter.
2) Thus far I have opted to revert back to my Linksys g router. However, before returning the product... any other adivce on a potential miss in the configuration or setup would be of great help.
3) Other's experiencing the same?
MacBook Intel & MacBook Pro Intel Mac OS X (10.4.8) SUing Comcast Cable Modem

Contacted Apple Support (have an AppleCare account) tonight and the issue has been resolved with the caveat that I cannot have a mixed (g & n) radio mode on the same airport extreme base without significant loss of performance. These are the steps I was walked through to resolve my particular case:
1) Verify that your hardware is indeed upgraded to use n (see steps in my original post)
2) Open the AirPort Utility (new program that was installed from the install disc under applications/utility)
3) Click on the Airport Extreme image on the right hand column to open the Airport Extreme settings
4) Select the "Wireless" tab, then "Radio Mode" drop down and select 802.11n only (5 GHz)
5) Select Update to apply new settings.
Results:
When running the speakeasy.net/speedtest I am seeing results that are indeed better. However, the test shows that the top speed lowers a bit and jumps back up unlike when I am on my old g router, which does not have such a jump.
This test is not perfect but a good gauge. If anyone has any other ideas to test performance more accurately, please do let me know.
Note: Only n enabled devices now work with the n router. I will keep my old g router as a backup and for my work pc laptop.
Hope the above helps and thanks.
MacBook Intel & MacBook Pro Intel Mac OS X (10.4.8)

I hope this might interest someone. The situation; 3 floors,I am having trouble with an an Airport Extreme, 802.11n on the top floor and a Mac Pro 3.1 on the bottom floor. Not always but often it has trouble seeing the Airport and making a connection. I h

I'm not sure how to post a message. I hope this might interest someone. The situation; 3 floors,I am having trouble with an an Airport Extreme, 802.11n on the top floor and a Mac Pro 3.1 on the bottom floor. Not always but often it has trouble seeing the Airport and making a connection. I have an older Airport Express, would it help to install it? would it work best if it was installed in the same room? should it be installed half way in between? Get another Extreme? The Mac Book Pro on the middle floor can see 11 networks in the neighbourhood if that might be causing a problem or would if I installed the Express. Thank for your consideration.

Thanks for your time ... I appologize for the font and colour, I compossed the question in pages and failed to notice the font colour as grey ... there are a variety of computers of various ages so I think it is using a setting that allows both 5G and 2.4 ... the connection to the Airport is thru a cable modem and cable does run throuhout the house ... maybe those hard wires would be a place to look at ... do you think that putting the 'Express' on the second floor might help ... thanks again ...

Speed issue with the AirPort Extreme (802.11n)

Hi, I was wondering if anyone could help out with this.
I am the Design Manager and IT Director at a publishing company where we have just upgraded to an AirPort Extreme (802.11n) base station to drive our network. We went this route as all of our machines are Mac Minis with built-in Airport and we were in a situation where re-doing a hardwire on the building was not going to be a possibility due to budget costs.
Our new configuration seems to be running very well and has the following devices connected to the AirPort Extreme:
Linksys Firewall Router (which was used on our old system and was requested by corporate to stay in the lineup to keep the static IP addresses we've already defined for our printers, VPN, etc. intact). The configuration on this part is modem to Linksys router to uplink port on the Airport).
New Panther, Intel based Xserve connected to the Airport's Ethernet port 1.
A 4 port ethernet switch connected to the Airport's Ethernet port 2 which drives four of our HP LaserJet printers.
Ethernet port 3 is not occupied.
All of the ethernet cords connecting our equipment are brand new.
For the most part, everything's been running blazing fast with a remarkable speed increase over our old hardwired setup. However, I've received a few complaints about slow speeds when dragging and dropping and working with files that are stored on our Xserve - we get alot of the "spinning wheel" and the transmission speeds seem very slow.
At present, we have several category 6 ethernet cords on backorder. I was planning on using one to take advantage of the gigabit ethernet capabilities between the Airport and the Xserve (as these are the only two elements of the network that support gigabit ethernet, besides the majority of our Mac Minis. Printers and cable modem are only 10-100 capable, so those will stand as is).
Can anyone tell me if the gigabit ethernet cord will be the solution to this one slow aspect of the new network? Any other settings I could apply to possibly speed up the transmission time when moving files to and from our server? Good news is that every workstation in the house is getting a full 4 bars.
Many thanks!

PS, just wanted to point out that we are also running in bridge mode.
Thanks!

Speed issue with WDS, Airport Extreme, and Airport Express 802.11n

I have a Airport network set up using WDS and two airport base stations: an Airport Extreme 802.11n, and an Airport Express 802.11n. The Extreme is configured to be WDS main and is connected to my cable modem and other computers, while the express is WDS relay and acts as a switch.
I don't actually have any wireless clients connecting to the express. I'm using it to connect a mac with no airport card to the network by plugging it into the ethernet port on the express. For the most part, it works, and the mac gets a network address and can access the network. However, the connection speed from the Express to the Extreme seems slower than it should be.
Since both are 802.11n, and the Mac is plugged into the Express's 10/100 ethernet port, I figure the theoretical top speed that the Mac should be able to communicate with another device plugged into the Extreme is at around the same speeds as 100 mbps ethernet, since the 100 mbps ethernet connection should be the bottleneck in this case. In reality, the speeds are much slower: when I transfer files between a machine connected to the extreme (via ethernet) and my mac, the speed tops out at about 2 megabytes a second, if that.
I looked in the Airport Extreme's logs, and it indicates that the Express is only connected at 54 mbps, as though it were a 802.11g Express. I have no idea why this is! Also, the only wireless communication is between the Extreme and the Express, so one wireless device acting as a relay for another (and thus cutting the throughput in half) shouldn't be an issue.
Does anyone know why the speeds are so slow, and if there's anything I can do to improve them?

Hello Brian Kendall. Welcome to the Apple Discussions!
I looked in the Airport Extreme's logs, and it indicates that the Express is only connected at 54 mbps, as though it were a 802.11g Express. I have no idea why this is!
That is because you established a WDS which only runs in 802.11g. Since you have two 802.11n base station, you would want to take advantage of the "Extend a network" feature available with these base stations.
Here's a typical setup:
o If practical, place the base stations in near proximity to each other during the setup phase. Once done, move them to their desired locations.
o Open AirPort Utility and select the base station that will connect to the Internet.
o Choose Manual Setup from the Base Station menu, or double-click the base station to open the configuration in a separate window. Enter the base station password if necessary.
o Click AirPort in the toolbar, and then click Wireless.
o Choose “Create a wireless network” from the Wireless Mode pop-up menu, and then select the “Allow this network to be extended” checkbox.
o Next, select the base station that will extend this network, and choose Manual Setup from the Base Station menu, or double-click the base station to open its configuration in a separate window. Enter the base station password if necessary.
o Choose “Extend a wireless network” from the Wireless Mode pop-up menu, and then choose the network you want to extend from the Network Name pop-up menu.
o Enter the base station network and base station password is necessary.
o Click Update to update the base station with new network settings.
(ref: Page 46 of "Designing AirPort Networks Using AirPort Utility.)

Trouble installing new AirPort Extreme (802.11n)

I just purchased the AirPort Extreme 802.11n base station. When I first turned on the AirPort Extreme base station the AirPort Utility program on my Mac recognized it immediately. I followed the instructions to configure it and everything seemed to be OK (green light is glowing on the base station). That said, now my Mac (AirPort Utility) no longer recognizes the base station. Any ideas what could be causing this problem or where I can go for help?

Did this problem with Airport Utility not "seeing" your base station happen immediately after configuring the device? Or has everything been working fine for days or months, and you noticed just now that the Airport Utility cannot see the base station.
Also - are you absolutely certain your Mac is wirelessly connected to your base station, and not the unsecured wireless network of one of your neighbors?

802.11n networking via new airport extreme to airport express/ airtunes

Have been trying to include an airport express in my new 802.11n/ new airport extreme network, using new airport utility. Does not seem to work yet manuals/ the support site do not seem to rule this out. I would just like to stream itunes to remote powered speakers via airport express. Can I do this or do I have to wait for a "new" 802.11n airport express to be produced?
Thanks!
macbook (black) Mac OS X (10.4.9)

I don't have much experience in this area, but I can assure it's supposed to be able to work together seamlessly. So no you should have to wait.
Have you tried basic troubleshooting? (repair permissions, reinstall software, reboot, etc.)

SERIOUSLY slow USB hard drive on the new Airport Extreme 802.11n

I have recently bought the new airport etreme 802.11n. Great little device, look wonderful on the office desk. I had some troubles getting it up and running on my machine but finaly got there in the end.
The USB hard drive is a great little addition that I was very excited about, untill I got it running. It is amazingly slow, for example I tried to copy a folder that contained 15 files which amounted to 135.6mb and it took 20 mins and 24 seconds to upload!
Is this just the speed that it should be uploading or is there somehting wrong with my settings.
I'm running on 3 bars of signal and the settings I'm using are:
connect with password (which is the same as the base stations password)
Automatically discover disks
Show in menu bar
If anyone knows the technical data for the transfer speeds and can confirm my queries I'd really appreciate it!
Thanks in advance

I have recently bought the new airport etreme
802.11n. Great little device, look wonderful on the
office desk. I had some troubles getting it up and
running on my machine but finaly got there in the
end.
The USB hard drive is a great little addition that I
was very excited about, untill I got it running. It
is amazingly slow, for example I tried to copy a
folder that contained 15 files which amounted to
135.6mb and it took 20 mins and 24 seconds to
upload!
Is this just the speed that it should be uploading or
is there somehting wrong with my settings.
I'm running on 3 bars of signal and the settings I'm
using are:
connect with password (which is the same as the base
stations password)
Automatically discover disks
Show in menu bar
If anyone knows the technical data for the transfer
speeds and can confirm my queries I'd really
appreciate it!
Thanks in advance
Does your drive meet these requirements?:
You can connect USB-based storage devices to an AirPort Extreme (802.11n). Learn which formats and protocols are supported.
The AirPort Extreme (802.11n) supports USB storage devices that have a block size of 512 bytes, and are formatted as Mac OS Extended (HFS-plus), FAT16, or FAT32. Not all USB storage devices use a block size of 512 bytes.
The AirPort Extreme (802.11n) shares storage devices based on the format used to initialize the storage device. For example, if HFS-plus formatting was used, AFP and SMB/CIFS protocols are used to share the device on the network. If FAT16 or FAT32 was used, SMB/CIFS protocols are used.
The AirPort Extreme (802.11n) works with disks that have a single partition and are not RAID volumes (no more than one volume per physical disk).
Note: Use AirPort Disk Utility to discover and mount AirPort Extreme-based volumes over the network.
William

WDS networking issue - Airport Extreme (802.11n) and remote Airport Express

*Background Info:*
Airport Extreme 802.11n (Fast Ethernet)
Version: 7.2.1
Wireless Mode: Participate in a WDS network (set as main)
Network Name: @Home
Wireless Security: WPA/WPA2 Personal
Channel: 1
Airport Express
Version: 6.3
Wireless Mode: Participate in a WDS network (set as remote)
Network Name: @Home
Wireless Security: WPA/WPA2 Personal
Channel: 1
Radio Mode: 802.11b/g compatible
Connect Using: AirPort (WDS)
Connection Sharing: Off (Bridge Mode)
Issue
Please help as I'm having issues with my WDS network. I've setup using both the wizard and manual and also hard reset on both units to setup again but cannot get them both to communicate to one another. Both units are showing green LED under their configuration. For my last attempt, I've tried adding the Airport ID (MAC) of the Airport Express to the Access Control and also DHCP Reservations on the Airport Extreme but still no luck.
The Airport Express (setup as remote) does not even show up in the Airport Extreme's Summary as Wireless Clients. In the WDS tab, the Airport Extreme is set up as WDS main, Allow wireless clients box checked and WDS Remotes has the Airport Express' AirPort ID in the list. On the Airport Express, WDS is set up as remote, with Allow wireless client box checked and the Airport ID of the Airport Express in the WDS Main.
I can connect clients to both units. Both units are configured using the same Network Name and have the same WPA/WPA2 security key. The Airport Extreme (main) however is connected to my broadband so any devices or clients connected to it are able to get outside. Connected devices or clients are assigned IP address via DHCP with IP 10.0.x.x. If wifi devices or clients connect to the Airport Express (remote) they are assigned a completely different IP addresses 169.254.x.x, they are not able to browse the internet or talk to other clients connected on the 10.0.1.x network. The Internet Connection configuration on the Airport Express (remote) is Connect Using Airport (WDS) and Using DHCP. I've even tried manually and entered the IP address 10.0.1.199 that I had assigned to the Airport Express from the Airport Extreme and Router Address as IP of Airport Extreme (10.0.1.1).
I think I've tried everything but I'm still having this problem. The remote Airport Express is not extending my existing Airport Extreme network. Any ideas???

Christopher,
This may or may not be helpful, or it may be something you've already tried or are aware of so I apologize if that's the case.
I have been researching ways to set up the Dual Band Network supported by the AEBS and came across your post. I've got an AEBS and (2) AirPort Express set-up currently (AEBS is main and the Express are participating in the WDS as remotes) and I'm trying to configure one of the Express to utilize a 802.11b/g compatible network while the AEBS runs a 5Ghz 802.11n Only network.
AAR, since the AirPort Express are 2.4Ghz 802.11b/g ONLY (no support for 802.11n), you have to be sure to set-up your AEBS first and select "802.11n (802.11b/g compatible)" in the Radio Mode drop-down on the AEBS before you attempt to connect an AirPort Express. The AEBS should be set-up as your "WDS main" and the Express should be set-up as a "WDS remote" for the network you established when you set-up the AEBS.
Bottom line here is the Express won't be seen by the AEBS unless the AEBS is 'looking' in the 802.11b/g 2.4Ghz frequency.
Hope this was helpful.

Timed Access not working on new Airport Extreme (802.11n).

I bought a new Airport Extreme (802.11n) to use as a router for my network. The network has a mixture of Macs and PCs, using a mixture of wired and wireless connections.
I configured the security settings with on the Airport Extreme to Timed Access. I set the default setting is to No Access.
Three computers are set with "Everyday, Between 8:00am and 11:00pm"; however, when it's 11:00pm, nothing happens. The three computers continue to have access.
I know the MAC addresses I entered are correct. Does anyone know why the Timed Access is not working?

Yes, the printer was initially set the same way it always was on my old router. It used to pop right up on the list. After I switched I was getting communication errors. Ok, new setup, I wasn't worried yet. When I got to the setup window and it a new printer wasn't found I tried updating drivers. No luck. I then used the IPP mode to enter the IP address with the address on the Canon screen. It failed. I then did the same setup telling it which software from the driver list to use. It still could not see it. The odd part is that the Canon can obviously see the router as its LAN setting read active and it is receiving the IP. I have proceeded to play with every setting on the printer and it is back to factory reset. Oh, I should mention that I have also tried to use Canons network setup utility software and it can not find the connection either. So I really think this is a problem within the router. I have seen many complaints about this on other forums, but most were looking to use the usb on the print server. My Airport is nowhere near my printer and I don't want to lose my all-in-one functions. Some think hard lined ethernet is ancient, but it really is a nice setup. Fast and reliable.

Notice Re: New Airport Extreme 802.11n Base

About an hour ago, I got off the phone with Apple Support. They were very helpful in getting "phase one" of my installation going. But in the process WE both discovered that the new Airport Extreme Base Station (802.11n) I had bought from the Apple Store nearby contained: OLD versions of setup software and pdf manuals!
I could not proceed to the final step (as we intended while on the phone) because I had just installed "v. 4.2" of the software and of course version 5 is needed.
Checking the pdf manuals - I could plainly see the OLD "flying saucer" model base was being depicted and the instructions were for that model. It was "funny" because the Apple Support person asked a couple of times, "Is the base you have a square about 1-inch thick?"
Of course, Support will send out word that there are some (who knows how many at this point) Airport Extreme Base Stations in stores (even Apple Stores) with obsolete software and documentation.
I just thought I'd post this for those who have not yet bought an AE Base Station - be sure to check this before buying.
My consequence are less happy: It's now Friday Aug. 31: It will take 5 business days for the replacement disk to arrive, next Monday is a US Holiday, which means I won't be able to complete my setup until week after next.

Thanks Rajesh, I may do that but it seems a shame now that the Apple Support lady is sending me a copy. I think instead, I may call the local store and ask if they know of the problem, first.
Because this Apple Store opened only about 5 weeks ago, I suspect this may be "new stock" which indicates that's all they'll have. Also, Apple Support said they'd notify the right parties - by which I think they mean their own and independent Apple retailers.
Anyway, I wasn't posting the info as a question: I wanted to notifiy those who may be about to buy Airport Extreme for themselves. I did some checking before posting here and found no other notices of this problem. So I guess I've got a "scoop" and wanted to be first in spreading the news.
I left out a good part of the whole story in my orignal post: what got me to Apple Support was that just connecting the base station (with ethernet cable) to computer knocked out my DSL service. I first called my ISP tech support and got that fixed. But such an easy procedure "backfiring" like that got me thinking, so I then went to Apple Support via phone. Only then did we discover I had the old version of the software. My "phase two" is just getting an eMac in the next room connected wirelessly - no big deal - so I may wait for that complimentary disk after all.
One possibly related item: After I finished talking to Apple Support, almost at once, Mail.app went down. It turned out - the mail .plist had gotten corrupted. I trashed that and Mail came back -but then I had trouble connecting to the mail server and had to re-do password and so-on. Right now, I'm "back to normal" but suspect that installing the old Airport software (a second time) is what kicked Mail to it's knees. Sure was a heckuva coincidence if it wasn't that, I've never - never had trouble with any version of Mail.app until now.
Message was edited by: macnoel

New Airport Extreme (802.11n): : Port Mapping... ***???

There are two different programs I was formerly using, whereby (after following instructions) I was able to create a static IP address for every machine on my network, plus open ports 8000 and 9990-9998 respectively. But ever since upgrading to the new Airport Extreme (802.11n), it completely stopped working. To boot, I've upgraded to Leopard on one of two of the machines (the other is still using 10.3.9).
I haven't been able to figure out for the life of me, how to configure it. It's no longer as obvious where and what information to put in. All guides that would remotely help are designed for the older Airport unit, which has completely different menus in the Airport Utility.
Is there anyone out there who has experience with Dot-Tunes and/or Nicecast or similar port mapping, who has the patience to describe, in layman's terms, what steps to take to get this set up correctly again, starting with how to reassign static IPs for my machines. I will not ask a lot of questions and take up too much more of your time. I'm just frustrated after a whole day of trying to figure this out and fruitless Google and forum searches.
Thank you so much.

I'm not familiar with either Dot-Tunes or Nicecast, but the following would be the general port mapping procedure with the 802.11n AirPort Extreme Base Station (AEBSn) using the AirPort Utility. Note in this procedure you will not need to assign a static IP address for each of your host devices. Instead you will be taking advantage of the AEBSn's DHCP reservations feature.
To setup port mapping on an AEBSn, either connect to the AEBSn's wireless network or temporarily connect directly, using an Ethernet cable, to one of the LAN port of the AEBSn, and then use the AirPort Utility, in Manual Setup, to make these settings:
1. Reserve a DHCP-provided IP address for the host device.
Internet > DHCP tab
o On the DHCP tab, click the "+" (Add) button to enter DHCP Reservations.
o Description: <enter the desired description of the host device>
o Reserve address by: MAC Address
o Click Continue.
o MAC Address: <enter the MAC (what Apple calls Ethernet ID if you are using wired or AirPort ID if wireless) hardware address of the host computer>
o IPv4 Address: <enter the desired IP address>
o Click Done.
2. Setup Port Mapping on the AEBSn.
Advanced > Port Mapping tab
o Click the "+" (Add) button
o Service: <choose the appropriate service from the Service pop-up menu>
o Public UDP Port(s): <enter the appropriate UDP port values>
o Public TCP Port(s): <enter the appropriate TCP port values>
o Private IP Address: <enter the IP address of the host server>
o Private UDP Port(s): <enter the same as Public UDP Ports or your choice>
o Private TCP Port(s): <enter the same as Public TCP Ports or your choice>
o Click "Continue"
(ref: "Well Known" TCP and UDP ports used by Apple software products)

Replace Airport Extreme with new AE(802.11n) on G5?

My existing wireless network includes the last version of the Airport Extreme (b/g?) and an Airpot Express is working fine. But since I'm planning to go to an Intel-based Tower sometime in the near future, I bought the new AE(n). I haven't installed it and wanted to check here first to see if it's worth the trouble before I have a MAC that can take advantage of the newer tech.
Is there any advantage for PPC-based MACs? Is there a way to safely save the configuration so I can revert to my existing setup if the new one proves problematical?
Thanks!

well,
my network is exactly the same as your so I'll give it a try. First update to the latest version of the OS (10.4.8) & run software update till you have nothing else to update. I configured mine using the setup and then going back and tweaking some of the settings. 1, find a channel that no-one is using in you area. sometimes wireless base stations on the same channel cause interference with each other. 2, after i set up my new airport extreme and setup the express to extend the network. i did find that the setup program setup the express as 802.11b only and it did slow up my network a bit (bump it to 802.11B/G). overall the performance was ok. I was getting 700kbs with my old extreme set up my way and with the new extreme I've been averaging 750kbs to 800kbs (iTunes tv show download)on my iMac G5. about the only thing that concerns me IMO is that with the old extreme, you could set the base station to any type you wanted to in my case "802.11G only" was the way I set up my old extreme. with the new one you only get 2 choices 802.11N or 802.11N B/G compatabile.
either way, I'm happy with my new base station. and I'm sure that when you do buy your next mac you'll certainly see a speed increase.

NEW Airport Extreme 802.11N & iMac G5

Pulled this from the Airport Extreme webpage and don't see the iMac G5 listed as compatible.
Does my Mac support 802.11n?
These Mac computers support 802.11n in the new AirPort Extreme Base Station using the included enabler software:
* iMac with Intel Core 2 Duo (except 17-inch, 1.83GHz iMac)
* MacBook with Intel Core 2 Duo
* MacBook Pro with Intel Core 2 Duo
* Mac Pro with AirPort Extreme card option
So can I use it with my iMac G5?
iMac G5 20" 2.1 w/ iSight Mac OS X (10.4.8)

What that list meant is only those listed computers support the new 802.11n wireless 'standard' (it is not technically a standard yet, still in draft form but it should be ratified as such soon). Nonethesless, your iMac G5 (given it has some sort of WiFi like 802.11a/b/g) will work with the new router because the new Airport Extreme supports all the older specs (802.11a/b/g) as well as the new 'n' (which again, is not completely a standard yet).
So it will work fine but you will only get the same speed as your current WiFi adapter in the iMac, which is standard g I believe. So even though you buy the new router with n, it does not mean you older g WiFi card will suddenly work faster, you would need n cards on both sides for that to be the case...
-TM

My new Airport Extreme 802.11n causes my PPC G5 to crash. Anyone else had this issue?, My new Airport Extreme 802.11n causes my PPC G5 to crash. Anyone else had this issue?

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