The simple answer is yes. There would be only 1 subnet, 1 subnet mask and 1 default gateway for all computers.

It is a good point to raise the issue of quality of service. I read over the manuals for this particular unit, and there is no mention of QOS. So you might want to see if you can provide for QOS using your Ehternet switch.

The more complicated answer is this: If you have an Internet router in the remote office too, then use it as the default gateway for the computers in the remote office. This has the added benefit of cutting down on the traffic going across the T1.

Now if you would like to add some redundancy to your Internet connection, set each computer to use the local Internet router as the default gateway and the remote Interent router as the secondary gateway. This way if one Internet connection goes down, your computers will use the other.

There is a way to do this using DHCP. It will come to me.