First let me apologize that I may not have all my network terms down properly, but I believe what I'm after is to get my DIR-655 to ONLY function as a "switch" in my home network. Here's the scoop.
Currently I run my 655 behind my ISP's DSL service. The 655 is plugged via it's "Internet port" to the ISP's DSL modem via a Cat5 cable. Hard-wired with Cat5 cable and hung off the "LAN" ports on the 655 are two desktop units and a NAS DNS-323 (hung off the DNS-323 is a USB printer). And of course, there are about 3 laptop units which access the Internet via the 655's wireless capability.
My local ISP is upgrading its service to provide HD TV to our home. They will be replacing their DSL box and one of the units they are putting in is also a wireless router. Due to requirements for servicing their preference is for me to switch to their wireless router. This supercedes my need to run the 655 as a wireless access point. However, because of the physical location and existing cabling in support of the NAS DNS-323 and it's USB-connected printer I want to keep those units plugged in where they are. I "think" I need essentially a network switch to sit in the spot that my 655 occupies. Do I have to replace the 655 or can I get it to function as "just a switch"

??
If more technical details are required, I can provide. I can provide details about the home setup, I'd have to ask more about my ISP's to be provided h/w.
Thanks in advance.
... Bill