PowerConnect 5524 in passthru

Is there a configuration/mode you can set these switches on that basically sets it as an unmanaged passthrough switch much like your standard linksys/netgear 5 port switches? We are replacing our external network firewall stack but want to test it before migrating from the old setup. we only have a single port from our fiber connection that our isp lets us use and they recommended we use an unmanaged switch between  their port and our firewalls. We have 15 ip's from our isp and currently use 9 of them with our current firewall. generic ip would be 20.25.17.22/27.