Amendment 2 to Recommendation ITU-T G.993.5 (2010) covers the following functionalities:

1.          Definition of flag tones and probe tones (corrigendum)

2.          SRA with retransmission (corrigendum)

3.          Definition of the SCC (corrigendum)

4.          UPBO optimization for ITU-T G.993.5 (addition of a Note)

5.          O‑SIGNATURE message (corrigendum)

6.          O‑P‑VECTOR 1 signal (corrigendum)

7.          Markers (corrigendum)

8.          R‑P‑VECTOR 1 signal (corrigendum)

9.          O‑TA_UPDATE message (corrigendum)

10.        R‑ERROR‑FEEDBACK message (corrigendum)

11.        Downstream Frequency Dependent Pilot Sequence (corrigendum)

12.        Upstream Frequency Dependent Pilot Sequence (amendment)