The Guardian RSVP2Tone ensures return quality where it is most critical -- the subscriber installation. Most return path problems begin in the subscriber’s home. Errors in installation, defective cabling, or incorrectly installed or loose hardware can all disrupt return path communications or allow ingress to enter the cable system. The RSVP2 tests the key return parameters that verify the installation is error-free and ready for the demands of VOD, VoIP and HSD return services.