Access to SXTs & Routers

Hi,

If my network is as follows:

RB912(10.10.10.x)------------------------> Customer SXT (bridge mode)(10.10.10.x)-------------->Router(PPPoE) (DHCP server 192.168.0.x)--------------->laptop

can I access the sxt from the laptop directly without physically connecting the cable from the SXT and disconnecting it from the router?
I heard that I can assign secondary IP for the router but I have no details about it.