Done 3 or 4 on the JACE403 ( and FX-40) used a US Robotics on 2 and the Board mounted on the others. All still work fine but SLOW !
Gave up on the Alarms thing after way too many hours of fighting it !
If sense were so common everyone would have it !
All opinions expressed are my own. Any advice provided is based on personal experience, generally accepted fact or publicly available information. As such, it is worth exactly what you paid for it, not a penny more not a penny less !!