The TB-20 Tally Box Converter from Datavideo is used to connect the ITC-100 Datavideo eight-user wired intercom system to the AG-HMX100 Panasonic switcher. It uses a 25-pin sub-D connector to extend the ITC-100 bi-color tally indicator function which indicates Live and Cue information. The cable can be reworked for use with other Panasonic switcher models.