Your NSB stage box must be clocked externally from your StudioLive Series III mixer. To do this, you must assign an output stream from your StudioLive mixer to your NSB stage box, either in UC Surface or from the touchscreen on your StudioLive Series III console.
For complete set-up instructions, please review the NSB-series Owners Manual.
Fig. 1 Selecting AVB Outputs from the Stagebox Setup menu
Fig. 2 Selecting AVB Outputs from the Stagebox Setup area in UC Surface