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4. [4] Recommendation ITU-T G.992.5, "Asymmetric digital subscriber line 2 transceivers (ADSL2) - Extended bandwidth ADSL2 (ADSL2plus)" [Online]. Available: https://www.itu.int/rec/T-REC-G.992.5-200901-I/en
5. [5] Recommendation ITU-T G.993.2, "Very high speed digital subscriber line transceivers 2 (VDSL2)" [Online]. Available: https://www.itu.int/rec/T-REC-G.993.2-201902-I/en