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VDSL
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==Profiles== The VDSL1 standard has three bandplans: Annex A (Asymmetric BandPlan), Annex B (Symmetric BandPlan) and Annex C (Fx BandPlan). Annex A and Annex B were formerly called Plan 998 and Plan 997 respectively. VDSL1 Annex C is intended for use in Sweden only and it uses a variable separating frequency between the second downstream band, and the second upstream band. All VDSL1 bandplans have spectrum up to 12 MHz, so the length of the copper loops must be shorter than ADSL.<ref>{{cite web| url=https://www.itu.int/ITU-T/worksem/asna/presentations/Session_6/asna_0604_s6_p4_palm.pdf | publisher=International Telecommunication Union (ITU) | title=IT-T xDSLxDSL Standards | access-date=2024-01-08}}</ref><ref>{{cite web| url=https://www.itu.int/rec/dologin_pub.asp?lang=s&id=T-REC-G.993.1-200406-I!!PDF-E&type=items| publisher=International Telecommunication Union (ITU) | title=Very high speed digital subscriber line transceivers | access-date=2024-01-08}}</ref> The VDSL2 standard defines a wide range of profiles that can be used in different VDSL deployment architectures; in the central office, in the cabinet or in the building for example.<ref>{{Cite web|url=https://www.itu.int/rec/T-REC-G.993.2/en|title = G.993.2 : Very high speed digital subscriber line transceivers 2 (VDSL2)}}</ref> {| class="wikitable" |- ! Profile ! [[Bandwidth (signal processing)|Bandwidth]]<br />([[Hertz|MHz]]) ! Number of<br /> total<br /> [[carrier wave|carriers]] ! Carrier<br /> bandwidth<br />(kHz) ! Maximum aggregate<br />downstream transmit<br />power ([[dBm]]) ! Max. [[downstream (networking)|downstream]]<br />[[Network throughput|throughput]]<br />([[Mbit/s]]) ! Max. [[upstream (networking)|upstream]]<br />throughput<br />(Mbit/s) |- | 8a | 8.832 | 2048 | 4.3125 | +17.5 | 50 | 16 |- | 8b | 8.832 | 2048 | 4.3125 | +20.5 | 50 | 16 |- | 8c | 8.500 | 1972 | 4.3125 | +11.5 | 50 |16 |- | 8d | 8.832 | 2048 | 4.3125 | +14.5 | 50 | 16 |- | 12a | 12 | 2783 | 4.3125 | +14.5 | 68 | 22 |- | 12b | 12 | 2783 | 4.3125 | +14.5 | 68 | 22 |- | 17a | 17.664 | 4096 | 4.3125 | +14.5 | 150 | 50 |- | 30a | 30.000 | 3479 | 8.625 | +14.5 | 230 | 100 |- | 35b | 35.328 | 8192 | 4.3125 | +17.0 | 300 | 100 |}
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