1. ITU-T Recommendation,”Phone Line Networking Transceivers
2. Foundation,” G.989.1, 2001
3. ITU-T Recommendation,”Phone line Networking Transceivers – Payload Format and Link Layer Requirements,” G.989.2, 2001.
4. ITU-T Recommendation,”Phone line Networking Transceivers – Isolation Function,” G.989.3, 2003.
5. ITU-T Recommendation, ”Phone line Networking Transceivers – Enhanced Physical, Media Access, and Link Layer Specifications,” G.9954, 2005