# Fields for a time\_signal message
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This table shows the fields that apply for an action to insert a time\_signal SCTE 35 message.


| Field | Description | 
| --- | --- | 
| Action type | SCTE 35 Time Signal. | 
| Action name | A name for this time\_signal action. For example, you might name time\_signal actions with a sequential number, restarting every day or every month. | 
| Start type  | Fixed or Follow or Immediate. | 
| Date and time | If the **Start type** is **Fixed**, specify the UTC start time for the time\_signal. The time should be at least 15 seconds in the future.<br />Note that the time is the wall clock time, not the timecode in the input. | 
| Reference action name | If the **Start type** is **Follow**, choose the input to follow. The dropdown list shows all existing input switches that are file inputs. Remember that a SCTE 35 action can follow input A only if input A is a file input and the source end behavior for input A is *continue*.<br />For information about these switching rules, see [Fixed, immediate, and follow switches](ips-switch-types.md). | 
| Follow point | If the Start type is Follow, complete this field. The follow point is always End, to indicate that the switch will occur when the input in Reference action name has finished. | 
| Add Scte35 descriptors | Choose this button and complete the fields that appear. The descriptors are a standard component of a time\_signal message. |