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# 3G-SDI Level

The 3G‑SDI output level is applicable only to 1080p video outputs, either as a standalone HD service
or as part of a quad‑link 3G‑SDI 4K service.

* Level A maps the SMPTE ST 274 format directly to a 3 Gb/s serial digital interface.

* Level B Dual-Link splits the 1080p image into SMPTE ST 372 dual‑link streams and conveys them
  within a 3 Gb/s serial digital interface.

  When **3G‑SDI Level B Dual Link** is selected and the video format is 1080p or 2160p, ancillary data
  is inserted into the specified line number (n) of each link. For example, if Line 9 is selected for
  VITC, the data is inserted into line 9 of Link 1 and line 572 of Link 2.

### Configuring 3G-SDI Level

To set the 3G-SDI level for outputting 1080p video, follow these steps:

* On the Home page, select the RECEIVER item from the required feed, then click  to edit.

* In the Parameters window, select the Output tab.

* Select the tab for the SDI output type, for example SDI 1.

* Select the required SDI output level from the 3G-SDI Level drop-down menu:

* Click Save and Continue to apply change.