초록 ▼

A data transmission system comprises a first device and a second device and a duplex data transmission connection therebetween. The first device sends to the second device user data on a data channel and control information on a control channel. The transmission is arranged in frames that comprise a

A data transmission system comprises a first device and a second device and a duplex data transmission connection therebetween. The first device sends to the second device user data on a data channel and control information on a control channel. The transmission is arranged in frames that comprise a user data field corresponding to a data channel and at least a first and a second control information field corresponding together to a control channel. In order to realise the control of the transmission power, there is determined a first transmission power level, a second transmission power level and a third transmission power level. From the second device to the first device there is transmitted a frame by applying said first transmission power level to the transmission of the user data field, said second transmission power level to the transmission of the first control information field and said third transmission power level to the transmission of the second control information field.

대표청구항 ▼

A data transmission system comprises a first device and a second device and a duplex data transmission connection therebetween. The first device sends to the second device user data on a data channel and control information on a control channel. The transmission is arranged in frames that comprise a

A data transmission system comprises a first device and a second device and a duplex data transmission connection therebetween. The first device sends to the second device user data on a data channel and control information on a control channel. The transmission is arranged in frames that comprise a user data field corresponding to a data channel and at least a first and a second control information field corresponding together to a control channel. In order to realise the control of the transmission power, there is determined a first transmission power level, a second transmission power level and a third transmission power level. From the second device to the first device there is transmitted a frame by applying said first transmission power level to the transmission of the user data field, said second transmission power level to the transmission of the first control information field and said third transmission power level to the transmission of the second control information field. b) commutate the phase legs of the direct converter for changing the end of the second transformer winding to which the respective phase output is connected in such a sequence and at such delays that desired voltage pulses are obtained on said terminal and do this until the current through the second transformer winding has changed direction, and c) starting over with controlling the VSC-converter to change switching state again. 41. A method according to claim 40, wherein it is carried out for a said apparatus in which said current valves of the VSC-converter each comprises a said snubber capacitor connected in parallel with said semiconductor device and rectifying member. 42. A method according to claim 40, wherein it is carried out for a said apparatus in which the VSC-converter comprises one said snubber capacitor connected in parallel to said first transformer winding. 43. A method according to claim 40, in which th e VSC-converter has two phase legs and said outputs connected to the ends of said first transformer winding are formed by a midpoint between current valves of a phase leg each, and wherein the VSC-converter comprises one said snubber capacitor interconnecting said midpoints between current valves of the two phase legs. 44. A method according to claim 40, wherein the semiconductor devices in the valves of the direct converter are controlled to turn off by zero-crossing of the current through the semiconductor devices. 45. A method according to claim 40, wherein the semiconductor devices of the VSC-c