Energy consumption of telecommunication access networks

6.2.3 Total power consumption VDSL2-Vectoring Power consumption access network and customer premises equipment (CPE) (100% of homes connected) Street cabinet Central office CPE VDSL2 Max ports VDSL2-Vectoring per street cabinet [W] Number of street cabinets Total VDSL2- Vectoring per street cabinet [W] Central office per subscriber [W] VDSL2 Vectoring per CPE [W] 48 195 361 70,395 0,96 10 96 268 68 18,224 144 277 61 16,897 192 254 36 9,144 >192 291 12 3,492 Total 538 118,152 24,299 253,110 Total power consumption VDSL2-Vectoring [W] 395,561 Total power consumption VDSL2-Vectoring [kW] 396 Figure 17: Total power consumption of the VDSL2-Vectoring access network and the CPE in the model region. A power consumption of 396 kW corresponds to 3,465,114 kWh per year. The production of a single kilowatt-hour in Germany creates 534 grams CO 2 3 . This leads to CO 2 pollution of approximately 1,850 tonnes per year. 6.3 HFC 6.3.1 Access network As described in chapter 6, the number of fibre nodes and the CMTS must be determined for HFC networks to estimate the power consumption of the access network. The numbers of fibre nodes and CMTS are derived directly from the service group size used. Model region Number of connections Service group size 16 32 64 128 256 512 A 2,884 181 91 46 23 12 6 Number of service groups B 5,181 324 162 81 41 21 11 C 6,160 385 193 97 49 25 13 D 4,282 268 134 67 34 17 9 E 3,209 201 101 51 26 13 7 F 3,595 225 113 57 29 15 8 Total 25,311 1,582 791 396 198 99 50 Figure 18: Number of fibre nodes depending on the service group size. Figure 18 shows howmany fibre nodes would be needed in the individual cities and in total to provide connections to all 25,311 possible subscribers by using different service group sizes. 3 Strom- undWärmeversorgung in Zahlen; Bundesumweltamt; http://www.umweltbundesamt.de/themen/klima-energie/energieversorgung/ strom-waermeversorgung-in-zahlen#Strommix; last access: 01. August 2017 21