Airport Express and AT&T Microcell connectivity problems

I have a similar setup, only I have the cable internet plugged into my Airport Express and I have a second Express in my room acting as a signal bouncer that joined the existing network. I plugged the AT&T microcell into the second Express and all but the ethernet lights are lighting up...does anyone know how to get this working? do I have to hook it up to an older router or upgrade to an airport extreme?

I'm going to echo your questions and ask again to see if anyone has resolved the Airport Express and Microcell concern. I think it has something to do with DHCP but I don't know enough to know how it works exactly.

I've tried the solution (posted by "Planet-Ed" found here:

http://forums.wireless.att.com/t5/AT-T-3G-MicroCell/MicroCell-Activation-Failed- Error-Code-103/td-p/1932420/highlight/true

But it's for the Airport Extreme so it hasn't worked for me yet.

I've also tried turning off DHCP, as suggested here:

http://www.ehmac.ca/mac-ipod-help-troubleshooting/65179-turning-off-dhcp-airport -extreme-base-station.html

And that hasn't worked either.

Any other thoughts?

The way to do this is to use the "Priority Mode" setup option, where the Microcell is actually between the modem and the Router. Connect a cable from the Airport Express to the "Computer" port on the back of the Microcell. Now, connect a cable from the yellow port on the Microcell to the port on the modem. Reset everything, and it should all work. This setup works just fine with my AirPort Express.

Variations on a theme

So my "free" MicroCell finally arrives and I hook it up between the DSL Box and my Time Capsule. After the waiting period and a very long call to AT&T MicroCell assistance we determine that the "third party" (that would be the Time Capsule/Airport) might be the cause of the varying DSL signal strength to the iMac and via Airport to my wife's iBook in the other room - the iBook suddenly isn't connected to the network anymore and tells me that the network has timed out....and after a while and several attempts to connect to the network the iBook is on line again. Didn't have this problem before the MicroCell. AT&T did offer that I could talk to their connection specialists and what a surprise - for only $49. Did I mention that my DSL service is from AT&T? and that only the lowest possible service level is available at my address, here on the dark side of the moon.

It would appear that the MicroCell does not have to be between the DSL Box and the Time Machine, but could be plugged into the Time Machine and still operate - of course then the Time Machine would really be a "third party device" and responsible for any slow down of DSL signal to the MicroCell. Anyone had any luck with a hook up like this?

I understand that the MicroCell needs a minimum of 1.5Mbps Download speed to operate properly. I have actually seen the signal strength that high a few times here....of course that is signal coming through the MicroCell and the Time Machine before it gets to the iMac

We finally got the microcell to work with AT&T explaining that we needed to use the priority mode--that is Comcast modem to microcell to Airport Extreme. Now, unhappily, our printer, which was working fine does not work. It is connected to the Airport Extreme through a USB cable.
Anybody got any ideas on this?