One dlink adsl modem with one ethernet port.
That is most likely a modem and router combo. As a router, it would include a DHCP server that is capable of assigning IP addresses to multiple connected PCs.
Each pc has its own static ip.
The router has a DHCP server that will assign IP addresses automatically. I recommend configuring all of the PCs to dynamic IP, then they will automatically receive non-conflicting IP addresses from the router.
Customer wants to add a wireless laptop and has brought a TP Link wireless router. But he wants me to just plug in the wireless router to one of the switches rather than have everything going through the router.
In that case you will want to configure the 2nd (TP-Link) router as an access point
. The reasoning here is to turn off the router (DHCP) functionality (thus making it function only as an access point) so all of the PCs are only assigned IPs from the first router. Scott.