Slow file server download speeds

Question

I have a Mac OS X 10.3 Server on my local network, which is primarily used as a file server.
My MacBook, running 10.6.7, using AirPort Extreme, is painfully slow and downloading files from this file server. Right now, it is estimating 14 hours to download a 400 MB file. The computer itself is only a few feet from the Airport base station.
Other clues:
1) All other Airport services seem normal (internet access, internet downloading) for this computer; so I don't see how it can be the Airport itself.
2) Uploading files to this file server seem to be running at normal speeds.
3) Downloading from other computers (running 10.5.8) from the file server are normal speeds, so I would think that would rule out the file server itself.
4) Activity Monitor shows only around 8 - 17 KB per second transfer
I believe that this problem started after the last OS update. Or security update, whichever it was.

Answer 1

Just wanted to post that I solved the problem.
It had to do with using the Motorola MSTATEA 2210-02-1022 DSL Modem/Router that we received from AT&T to do our Routing instead of the Time Capsule we had on our network.  I thought the Motorola DSL Modem/Router would do a better job of routing and was WRONG.
Once I put the Motorola DSL Motem/Router into "bridge mode" and set up the Time Capsule to be the router for the network, the problem went away.
So the Motorola DSL Modem/Router could not handle even the low traffic of our few computer network without screwing up the wireless traffic.