Multimode DMT Transmission System Enabling (XTSE). A list of the different modulation types enabled in this profile for multimode. It is coded in a bit-map representation with 1 or more bits set. A bit set to '1' means that the VTUs may train in the respective mode for the DSL line. A bit set to '0' means that the VTUs cannot train in the respective mode for the line. All 'reserved' bits should be set to '0'. Bit Assignments: Bit 00: T1E1 ADSL Issue 2 Bit 01: Full Rate ADSL Over POTS Bit 02: Full Rate ADSL Over ISDN Bit 03: Full Rate ADSL in TCM-ISDN Bit 04: Full Rate SSDSL in ISDN Binder Bit 05: All Digital ADSL Bit 06: Lite ADSL Over POTS/ISDN Bit 07: Lite ADSL in TCM-ISDN Bit 08: ADSL2 Over POTS Bit 09: ADSL2 Over ISDN Bit 10: All Digital ADSL2 (POTS) Bit 11: All Digital ADSL2 (ISDN) Bit 12: Double Upstream ADSL2 Bit 13: RE-ADSL2 Over POTS Bit 14: ADSL2 Lite Over POTS Bit 15: All Digital ADSL2 Lite Bit 16: ADSL2+ over POTS Bit 17: ADSL2+ over ISDN Bit 18: All Digital ADSL2+ (POTS) Bit 19: All Digital ADSL2+ (ISDN) Bit 20: Double Upstream ADSL2+ Bit 21: VDSL1 Bit 22: VDSL2 Annex A Bit 23: VDSL2 Annex B Bit 24: VDSL2 Annex C