Recommendation ITU-T G.9711 Amd 1 specifies or corrects: DBR-PT and bidirectional DBR for facilating the acceleration of DBR, diagnostics and monitoring of DTA, downstream PSD objects common to all links in the P2MP group, upstream frame configuration request, and support of DTFO in P2MP TDMA/FDMA. The changes relative to corrected items are with the following change bars. The changes relative to new material are with the following change bars NOTE – Some changes relatrive to new material texts further revised corresponding changes relative to corrected items.