In applications that require more than 2 monitoring inputs, the OP72 adds another 2 HD-SDI and SD-SDI inputs for a total of 4 monitoring SD&HD - SDI inputs. Specifications for this option are identical to the specifications of the LV 5700A standard inputs (see page 12 for specification details). All of the monitoring/measurement features and capabilities of the LV 5700A apply to the OP72 inputs as well.