US lawIllinoisRegulationsTitle 83 — PUBLIC UTILITIESCHAPTER I: ILLINOIS COMMERCE COMMISSIONSUBCHAPTER f: TELEPHONE COMPANIESPart 731 — WHOLESALE SERVICE QUALITY FOR TELECOMMUNICATIONS CARRIERSSubpart D731.40083 Ill. Adm. Code 731.400Applicability of Subpart DYear: 2026Length: 18 wordsOfficial source Section 731.400 Applicability of Subpart D The provisions of Subpart D are applicable to all Level 1 carriers.Next83 Ill. Adm. Code 731.405