Tex. R. Disc. P. 2.23
The Respondent or Commission may appeal the judgment to the Board of Disciplinary Appeals. Such appeals must be on the record, determined under the standard of substantial evidence. Briefs may be filed as a matter of right. The time deadlines for such briefs shall be promulgated by the Board of Disciplinary Appeals. An appeal, if taken, is perfected when a written notice of appeal is filed with the Board of Disciplinary Appeals. The notice of appeal must reflect the intention of the Respondent or the Commission to appeal and identify the decision from which appeal is perfected. The notice of appeal must be filed within thirty days after the date of judgment, except that the notice of appeal must be filed within ninety days after the date of judgment if any party timely files a motion for new trial or a motion to modify the judgment.
Tex. R. Disc. P. 2.23