Connect ROLM to * VIA 1 DID

Just want to know if I am going about this the right way. Here is the setup I want.

DID --> ROLM PBX --> Linksys SPA-2102 --> Asterisk.

Is the Linksys SPA-2102 the correct way to go. Or do I need and ATA with an FXO Port.

Does any of the above make any sense?