The base WVR6100 instrument monitors SD inputs, and can be ordered with options CPS to add monitoring of analog composite inputs, options DS, AD, DD or DDE for multiple-channel audio, and options EYE or PHY for physical-layer measurements. The base WVR7000 instrument monitors HD inputs, and can be ordered with option SD to add monitoring of SD inputs, option CPS to add monitoring of analog composite inputs, or options DS or AD for multiple-channel audio. The base WVR7100 instrument monitors HD inputs, and can be ordered with option SD to add monitoring of SD inputs, CPS to add monitoring of analog composite inputs, options DS, AD, DD or DDE for multiple-channel audio, and options EYE or PHY for physical-layer measurements. All models use an external XGA monitor for the display. This section covers the full capability, so some portions may not apply to a model with fewer features.