For ADSL/ADSL2/ADSL2+ (ITU-T G.992.1, G.992.3, G.992.5) circuits I always use the following definition for the FDD (frequency division duplex) bands --
DS > 32 > US > 6Where DS & US are the "receive" & "transmit" (or "return from" & "go to") bands relative to the CPE and the numbers are the sub-carrier (or tone) index. (The observant will note that I ignore sub-carrier index 32 and leave it as a sort of no-man's-land between the two bands.)
For profile 17a VDSL2 (ITU-T G.993.2) circuits I have not been able to find a definitive statement of the sub-carriers for each FDD band. I have looked at many ITU-T recommendations without success. Could somebody point me in the right direction, please?
I have many data sets, for VDSL2 circuits, archived and decided to extract the "Discovery Phase (Initial) Band Plan" (rather than the "Medley Phase (Final) Band Plan") from each and look to see if there was commonality across all the data sets. A rather surprising result was obtained --
Discovery Phase (Initial) Band Plan
US: (0,95) (696,1183)
US: (0,95) (868,1207) (1972,2783)
US: (0,159) (876,1199) (1980,2775)
US: (6,31) (882,1193) (1984,2770)
US: (7,32) (871,1205) (1972,2696)
US: (7,32) (871,1205) (1972,2782)
DS: (32,687) (1192,1627)
DS: (32,859) (1216,1963) (2792,3939)
DS: (32,859) (1216,1963) (2792,3959)
DS: (33,857) (1218,1959) (2795,4083)
DS: (33,859) (1216,1961) (2793,3863)
DS: (33,859) (1216,1961) (2793,3959)
DS: (33,859) (1216,1961) (2793,3970)
DS: (40,863) (1212,1963)
Hmm . . .