WO2002033917A1

WO2002033917A1 - Method for transmitting digital data, particularly over an electric network, as well as associated units and an associated program

Info

Publication number: WO2002033917A1
Application number: PCT/DE2001/003589
Authority: WO
Inventors: Thomas Bebko; Wilfried Krug; Stephan SCHÜLER; Michael Winkelmann
Original assignee: Siemens Aktiengesellschaft
Priority date: 2000-10-20
Filing date: 2001-09-18
Publication date: 2002-04-25
Also published as: DE10052179A1

Abstract

The invention relates to a method, according to which digital data is generated within periods of the same duration by at least two transmitting units. The digital data of a transmitting unit generated within a period is assigned as a useful load to at least one data packet (120). The data of different transmitting units is conveyed in different data packets. The data packet (120) is addressed (ADRC) and, afterwards, is synchronously transmitted, in time multiplex, over a transmission medium common to a number of transmitting units.

Description

description

Method for transmitting digital data, in particular via a power network, and associated units and associated program

The invention relates to a method in which digital data is generated by at least two transmission units within equally long periods. The digital data of a transmission unit generated within a period are assigned as payload to at least one data packet. The data from different transmission units are transported in different data packets. Depending on the recipient, the data packets receive an address part, the data of which address the recipient. The data packets are then transmitted via a common transmission medium.

When transmitting voice data, the period duration of the period is, for example, 125 μs or a multiple of 125 μs. If multiples of 125 μs are used, multiples of the amount of data transmitted at 125 μs must also be transmitted. Within a period of 125 μs, a transmission unit generates eight bits, for example, which are generated, for example, by sampling a speech signal. The sample value is encoded according to a coding method, for example according to the PCM method (Pulse Code Modulation), see standard G.711 of the ITU-T (INTERNATIONAL Telecommunication Union - Telecommunication Standardization Sector). However, instead of the voice data, data intended for a personal computer can also be transmitted, e.g. Program data or file data.

When voice data is transmitted over a packet network, such as the Internet, there is a loss of voice quality. This reduces the acceptance of such services, for example the VoIP (Voice over. Internet Protocol) service. On the other hand, methods for the synchronous transmission of voice data ten known with the aid of a time-division multiplex method that uses transmission channels. The voice quality in such procedures is very high. Synchronous means in accordance with a clock signal with a constant clock period and with a fixed assignment with respect to the clock signal. The clock period specifies sampling times of a speech signal. Even the smallest deviations from the relevant sampling time when sampling or reconstructing the speech signal lead to audible quality losses.

It is an object of the invention to provide a simple method for transmitting digital data which makes good use of the bandwidth of a transmission medium and nevertheless enables synchronous transmission of data, and which can also be used in particular in telecommunications systems. In addition, an associated transmitting unit, a receiving unit, an integrated circuit arrangement and an associated program are to be specified.

The object related to the method is achieved by the method steps specified in claim 1. Further developments are specified in the subclaims.

The invention is based on the consideration that by using data packets with addresses of a recipient, a transmission medium can be used well because no resources have to be reserved for individual connections. On the other hand, the major disadvantage of data packets is the fact that synchronous data transmission is difficult. Channels are preferred for synchronous data transmission. Therefore, data packets are used in the method according to the invention in order to be able to make good use of a transmission medium with regard to its transmission rate. To ensure the synchronicity of the transmission, transmission channels of a time-division multiplex method are used. In the method according to the invention, the data packets for different receivers are transmitted synchronously with the aid of a time-division multiplex method in at least two transmission channels of a common transmission medium. In the method according to the invention, one data packet is transmitted in a transmission channel in one period. In addition, data packets from both transmission units are transmitted in one period. These measures ensure that each transmission unit sends at least one data packet within a period and that the data packets can be transmitted synchronously. It is guaranteed that the order of the data packets remains unchanged even without additional measures. There are no delay times due to the sorting of data packets. However, using the data packets offers the possibility of assigning the data packets to the transmission channels at will and in a simple manner.

If the assignment of the data packets to the transmission channels changes between successive periods, measures must be taken on the receiving side in order to record the addresses of a recipient in different transmission channels between successive periods. The effort required for this is justified in particular if this measure allows the transmission bandwidth of the transmission medium to be used considerably better.

In a development of the method according to the invention, a data packet for the same receiver is transmitted in a transmission channel in successive periods. This measure considerably simplifies the detection of the address in the data packets on the receiving side because it can be assumed that the same address occurs repeatedly in successive periods in a transmission channel. Synchronization methods, such as PLL circuits, can be used. However, the advantage of using data packets to selectively assign data packets to transmission channels remains receive. In this way, the data packets can also be assigned to another transmission channel, in which a data packet for the same receiver is then transmitted again in successive periods.

In a next development, a transmitter unit, a receiver unit or a transmitter-receiver unit is defined as the higher-level control unit. The higher-level control unit controls the assignment of the data packets to the time-division multiplex channels. In one embodiment, the higher-level control unit also generates a synchronous mark that is used to synchronize all the transmission units and reception units using the transmission medium. For example, the synchronous mark is sent at the beginning of each period. The superiority of a control unit over other control units is also referred to as the master-slave method.

In a next development, the higher-level control unit assigns data packets to the transmission channels in such a way that a plurality of transmission channels serving for the transmission of voice data lie in an uninterrupted part of a period. Free transmission channels or transmission channels serving purposes other than the transmission of voice data lie in another contiguous part of the period. This measure allows data for computers or computers, e.g. Program data or file data are transmitted in several successive transmission channels. This facilitates the transmission of this data because the data can be extracted from successive transmission channels or can be sent in successive transmission channels.

In a next development, the higher-level control unit releases transmission channels no longer required for the transmission of voice data for the transmission of data to or from a computer unit. On the other hand, the higher-level control unit does not request transmission channels for the transmission of voice data, if necessary of voice data, for example a transmission channel in which data is currently being transmitted from or to a computer unit. The transmission of voice data is therefore assigned a higher priority than the transmission of computer data.

In one embodiment, a plurality of transmission channels are assigned to a computer unit at the same time. If transmission channels are requested by the higher-level control unit, the number of transmission channels assigned to a computer unit is reduced.

In the next development, an address allocation package is used for control. The address assignment package contains an extra frame bit to identify the position of a time frame with the period. In addition, the address assignment package contains a package type bit to identify the type of data package. This bit has a uniform value for address allocation packages, e.g. the value one. Several bits are used to record an address value that identifies the receiving unit. The address allocation package is transmitted, for example, in a transmission channel that is currently not used for the transmission of voice data or computer data. A newly added terminal device waits for the address assignment packet and responds to the higher-level control unit with a response address assignment packet in which an address assignment bit is set to a predetermined value. On the basis of this bit, the control unit recognizes that a terminal device wants to use the address sent in the address assignment packet. This address is assigned to the newly added terminal in an address assignment table. The following address assignment packages have an address that has not yet been used.

When assigning addresses, a collision detection procedure can be used to ensure that the simultaneous addition of end devices is possible without errors and cannot lead to malfunctions. Known methods can be used for collision detection, for example those of the ISDN bus (in- tegrated Services Digital Network) known procedures. By querying the end devices with additional data packets, the control unit can determine whether a end device has been removed. For example, such queries are carried out every second. If a terminal has been removed, the address of this terminal is marked as free in the address assignment table.

An address assignment package of the control unit is also answered by an additional terminal device with an address assignment package. The packet type bit is not required if the response is in the following transmission channel. In this case, the packet type bit can be used as a response bit, the value of which is changed by the added terminal. The control unit recognizes from the changed value that a terminal has been added.

In a next development, a data packet contains an overframe bit for identifying the position of a time frame with the period. A packet type bit is used to identify the type of packet. Several bits are used to record the address of the recipient. This means that the packet header is the same in an address assignment packet and a data packet.

The next time the data package contains the

Packet trunk a bit sequence in which the assignment of the bit positions - apart from any compression which may have been carried out according to a compression method - corresponds to the assignment of the bit position of a bit sequence which is transmitted between a transmitting unit and a receiving unit which are connected via separate transmission media. The structure of the end devices for processing the bit sequence in the packet trunk does not have to be changed by this choice of the assignment of the bit positions when changing from a common transmission medium to separate transmission media or in the opposite direction. In a next development, the assignment of the bit position of the bit sequence fulfills a protocol of the protocol family for the interface of a telecommunication system to end devices. So far, one end device or two end devices have been connected separately according to one of these protocols, ie via a separate line to the telecommunication system. By means of the method according to the further development, the same terminals can also be used with a common transmission medium for several terminals with different addresses. In particular, the UPOE protocol is used as the protocol, which was previously used in the HICOM telecommunications system from SIEMENS AG.

With the structure unchanged, the end devices only require an adapter, which allows them to use the common transmission medium. In addition, the adapter carries out the above-mentioned steps of the method according to the invention and tunnels the data in accordance with the protocol for the individual connection of the terminals to the telecommunications system from the telecommunications system to the terminals or from the terminals to the telecommunications system.

In a next development, the method for transmitting digital data between a telecommunication system and several terminals connected via the same transmission medium is used. The air interface, e.g. a radio link or a line network is used. The end devices are no longer connected to the telecommunication system in a star shape, but via a line network in which several end devices with different addresses are connected to the same line. The line network has, for example, a bus structure or a branched structure.

In another development, a line network composed of electrically conductive lines is used as the transmission medium, in particular the power supply network. Through this As a measure, a power supply network that is already present in a building can be used to connect the end devices to the telecommunications system. An additional wiring of the end devices with the telecommunication system is not necessary.

The transmission bandwidth of electrically conductive lines is very limited and is usually less than two megabits per second. With the method according to the invention, even with this very limited bandwidth, several telephones can be connected, e.g. eight phones. Nevertheless, the bandwidth of the transmission medium can be used well because the transmission channels are not permanently assigned to the end devices.

In one development, a synchronization mark is transmitted, which is preferably repeated after a period or after a few periods. A bit position in the data packets and / or in the address assignment packets can be provided for the synchronization mark. However, other methods can also be used for synchronization, e.g. a code violation, as is known in ISDN methods.

The invention also relates to a transmitter unit, a receiver unit, an integrated circuit arrangement and a program which are suitable for carrying out the method according to the invention or a development of the method according to the invention. The technical effects mentioned above also apply to the units and the program.

Exemplary embodiments of the invention are explained below with reference to the accompanying drawings. In it show:

FIG. 1 a plurality of terminal devices connected to a telecommunications system via a power supply network,

2 shows the structure of an address allocation packet and a UPN data packet, FIG. 3 shows the structure of a time-division multiplex frame with several transmission channels,

Figure 4 functional units of a higher-level adapter, and

Figure 5 functional units of a subordinate adapter.

Figure 1 shows a telecommunications system 10 of the type

"HICOM" from SIEMENS AG. The telecommunications system 10 is used to provide connections free of charge within the private area of its operator. The structure of the telecommunications system 10 basically corresponds to the structure of the "HICOM 150" telecommunications system. In addition to this

However, the telecommunications system 10 contains a higher-level adapter 12, which is also referred to as a master adapter. The structure of the adapter 12 is explained in more detail below with reference to FIG. 4.

The telecommunications system 10 is connected to the ISDN network 16 via an outside line 14. Five terminals 18 to 26 of the OPTISET-E type are connected to the telecommunications system 10. In addition, the telecommunications system 10 is connected to a computer 28.

The terminals 18 to 22 are connected to the telecommunication system 10 via separate connecting lines 30 to 34, as was previously the case. User data and control data are transmitted on the connecting lines 30 to 34 in accordance with the previously used UP0E protocol. The terminals 24 and 26 and the computer 28, on the other hand, are connected to the telecommunications system 10 via a power supply network 36. The power supply network 36 carries a voltage of 230 volts and is used primarily to supply the telecommunications system 10 with a supply voltage. The telecommunication system 10 is therefore connected to the power supply network via a network line 38 36 connected. A power line 40 of a subordinate adapter 42 is also connected to the power supply network 36. On the one hand, the supply voltage for the adapter 42 is conducted via the mains line 40. On the other hand, however, data are transmitted to the telecommunications system 10 via the network line 40, including the network line 38 or from the telecommunications system 10 to the adapter 42. A protocol UPN, explained in more detail below, is used for this. A connection line 44 leads from the adapter 42 to the terminal device 24. The data are transmitted on the connection line 44 in accordance with the UPOE protocol.

In a similar manner, a power line 46 connects a subordinate adapter 48 to the power supply network 36. A connecting line 50 leads from the subordinate adapter 48 to the terminal 26.

The computer 28 is connected to a further subordinate adapter 54 via a connecting line 52. The adapter 54 has a power line 56 that leads to the power supply network 36. Data are also transmitted via the network line 56, which come from the telecommunications system 10 and are to be transmitted to the computer 28 or which come from the computer 28 and are to be transmitted to the telecommunications system 10.

The terminals 18 to 26 are of the same type. Each terminal 18 to 26 can be connected to a second terminal.

The structure of the adapter 12 or the adapter 42 and 48 is explained below with reference to FIG. 4 and FIG. 5. The structure of the adapter 54 is explained with reference to FIG. 5.

FIG. 2 shows the structure of an address assignment packet 100 that is sent by the higher-level adapter 12. The address assignment package 100- contains, in the order in which the bits are transmitted: an overframe bit LF to identify the position of a time-division multiplex frame. The use of this identification is explained in more detail below with reference to FIG. 3.

a packet type bit PT with the value one. The value one identifies the address allocation package 100 as such.

four address bits ADRA for recording an address value to be assigned.

eight bits of a fill bit sequence in which the bit values one and zero occur alternately.

- A maintenance channel superframe bit M, which is used in the UPOE protocol.

An address allocation package 102 is returned by a subordinate adapter 42, 48 to the address allocation package 100 in response. The address allocation package 102 is one

Exception how the address allocation package 100 is structured. Instead of the packet type bit PT, an address assignment bit AV is contained in the address assignment packet 102. If a terminal is added, this terminal sets the address assignment bit AV to the value one. When the address allocation packet 102 is received, the higher-level adapter 12 recognizes that a new terminal has been added, to which an address noted in address bits ADRB, not shown, of the address allocation packet 102 is assigned. The address noted in the address bits ADRB is taken from the address bits ADRA. Further bit positions 104 of the address allocation package 102 are indicated by dots. A broken line 106 shows the separation between the transmission channels for transmitting the address allocation packet 100 and for transmitting the address allocation packet 102. The transmission channels are explained in more detail below with reference to FIG. 3. The address allocation packets 100 and 102 are each only 15 bits long. This creates a gap 108 in the transmission channel used to transmit the address allocation packet 100 or the address allocation packet 102. However, the fill bit sequence can be extended such that an address allocation packet 100 or 102 completely fills the transmission channel used for its transmission.

FIG. 2 also shows a UPN packet 120 which is used to transmit user data between the telecommunications system 10 and one of the terminals 24 to 28. The packet 120 is sent by the higher-level adapter 12 and contains, in the order in which the bits are sent:

- A superframe bit LF, the function of which the function of

Superframe bits LF in the address allocation package 100 corresponds. This function is explained in more detail below with reference to FIG. 3.

- a packet type bit PT with the value zero. A UPN packet is identified by the value zero.

four address bits ADRC to identify the recipient of the packet 120. The address bit of the address bits ADRC transmitted first serves to distinguish the transmission of digital voice data from the transmission of digital computer data. The remaining three bits of the address bits ADRC directly address a terminal.

- Four compressed data bits Bla of a first base channel Bl, on which, for example, a first subscriber speaks.

four compressed data bits B2a of a second base channel B2, on which, for example, a second subscriber speaks. two data bits Dia for controlling the connection relating to the base channel B1.

two data bits Dlb for controlling the connection belonging to base channel B2.

four compressed data bits Blb of the base channel Bl.

four compressed data bits B2b of the base channel B2.

a superframe bit M that has the same meaning as the superframe bit M in the address assignment package 100.

The data packet 120 thus contains sixteen bits for the transmission of compressed speech data, which correspond to 32 bits of uncompressed speech data. This is due to the fact that each end device is assigned two voice channels and that the UPN packets belonging to the basic channels B1 and B2 are only transmitted synchronously every 250 μs.

A UPN packet 122 is sent from a lower-level adapter 42 or 48 to the higher-level adapter 12. The UPN packet 122 has the same structure as the UPN packet 120. The value of the packet type bit PT in the packet 122 is also zero. Further bit positions 124 are indicated by dots.

A dashed line 126 indicates the boundary between two successive transmission channels that are used to transmit packet 120 and packet 122. The arrangement of these transmission channels is explained in more detail below with reference to FIG. 3.

Packets 120 and 122 have the same number of bits, 54 bits each. The transmission capacity of the transmission channels is dimensioned so that a

Data packets 120 or 122 exactly the time available for a transmission channel is used. That means, that the transmission capacity of the transmission channels is matched to the number of bits in the data packets 120 and 122, ie to data packets for both transmission directions.

FIG. 3 shows the structure of an overframe 150, in which sixteen transmission channels UO to U15 of the same transmission capacity are contained. Starting with the transmission channel UO, every second transmission channel U2, U4 etc. is used to transmit an address assignment packet or a UPN packet from the higher-level adapter 12 to a lower-level adapter 42, 48 to transmit an address allocation packet or a UPN packet in the opposite direction, ie from a subordinate adapter 42, 48 to the superordinate adapter 12.

250 μs are required for the transmission of the sixteen transmission channels UO to U15. The transmission of bits of the transmission channel U0 is then started again.

FIG. 3 shows a UPN packet 152 which is transmitted in the transmission channel U0 from the telecommunication system 10 to the terminal 24. A UPN packet 154 is sent in the transmission channel U1 from the terminal 24 to the telecommunications system 10. In the packets transmitted in the transmission channel U0, the superframe bit LF is always set to the value one. In all other transmission channels U1 to U15, on the other hand, the superframe bit LF has the value zero, see arrow 156. Using the superframe bit LF in the transmission channel U0, all subordinate adapters 42, 48 can synchronize with the superordinate adapter 12.

UPN packets 152 and 154 each contain 27 bits. A compressed bit sequence 162 is thus generated in the adapter 12 from an uncompressed bit sequence 158 in accordance with the UP0E protocol using a compression method 160. Compression method 160 compresses the bits of the base channels by a factor ω ύ M IV) cπ O cπ o Cπ O Cπ

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Address allocation package in which the address allocation bit AV is one and the address bits ADRB are six. In addition, the adapter 48 reads the address bits ADRA and stores the address ADR6 assigned to it. This address is used when adapter 48 sends data packets. A synchronization unit of the adapter 48 always synchronizes to the transmission channel in which data packets with the address ADR6 are to be received. At the beginning this is the transmission channel U13.

After the transmission channels U12 and U13 have been assigned, the transmission channels U14 and U15 are used for address control. In another embodiment, all addresses are assigned. If a terminal connected to the power supply network 36 and suitable for data transmission is removed, e.g. the terminal 24, the transmission channels that become free, here the transmission channels UO and U1, are recognized by the higher-level adapter 12. If the transmission channels that become free are at the beginning or within the sequence of the transmission channels UO to U15 used for voice transmission, the assignment of the addresses to the transmission channels UO to U15 is changed. Care is taken to ensure that the transmission channels are used for the transmission of voice data without interruption starting with the transmission channel UO. In the exemplary embodiment, this means that the address ADR1 is assigned to the transmission channels UO and Ul. The address ADR2 is assigned to the transmission channels U2 and U3, etc. The assignments of the transmission channels UO to U15 to the addresses are expediently only changed if there is currently no connection to the terminal addressed with the address for the transmission of voice data or computer data.

FIG. 4 shows functional units of the higher-level adapter 12. The power line 38 of the adapter 12 leads to a power supply unit 200, which is used to power the adapter 12. The adapter 12 also includes a power line Interface 202, a network line control unit 204 and a packetizing unit 206. The adapter 12 is connected to the telecommunications system 10 via a bus system 208. In a HICOM 150, the bus system 208 is otherwise used to connect a module to which, in turn, eight OPTISET-E terminals are connected using separate connecting lines. The interface used on the bus system 208 is also referred to as IOM2 (ISDN-oriented modulator 2).

The power line interface 202 and the power supply 200 perform the functions of the physical layer 1 according to the OSI model (Open Systems Interconnection). The data coming from the power line control unit 204 is coupled into the power supply network 36 in the power line interface 202, e.g. inductive. On the other hand, data coming in via the power supply network 36 are decoupled with the aid of the network line interface 202 and transferred to the network line control unit 204.

The power line control unit 204 fulfills functions of the data link layer 2 according to the OSI model. More precisely, functions of layer 2a are carried out, which have been defined for local area networks. This layer is also known as the MAC layer (Medium Access Control). The tasks of the power line control unit 204 include:

the so-called packet polling, which is carried out as part of the address assignment for the determination of terminals that have been disconnected from the power supply network 36.

creating the packet frame structure, i.e. of the superframe 150 by setting the superframe bit LF in accordance with the method explained above with reference to FIG. 3.

the detection of the transmission channels U1, U3 etc. when receiving data packets. the channel assignment when sending data packets in transmission channels UO, U2 etc.

- the creation and maintenance of the address assignment table.

The other functions of the data link layer 2 are performed by the packaging unit 206. In the case of local networks, these functions are assigned to a layer 2b, which is also referred to as a link control layer (logical link control). The functions of the packaging unit 206 include :

the compression or decompression of the data transmitted in the B channels.

the integration of the compressed basic channel data in data packets or the extraction of the compressed basic channel data from data packets.

the packaging and unpackaging of the data transmitted in the control channels D.

backing up the data transmitted in the D channel.

monitoring the connection to the power supply network 36.

The functions of the packaging unit 206 and the network line control unit 204 can be implemented in a simple manner, for example with the aid of a digital signal processor and with the aid of FIFO memories (First In First Out). A digital signal processor usually contains an analog-to-digital converter and / or a digital-to-analog converter. The signal processor has instructions in its instruction set with which digital signal processing can be carried out faster than with a conventional processor or microprocessor with the same clock rate. leads, for example, there is a command to execute a filter function, especially a convolution operation.

FIG. 5 shows functional units of the subordinate adapter 42. The power line 40 is connected to a power supply unit 220 which serves to supply the adapter 42 with power. In addition, the power supply unit 220 is connected to a power line interface 222, which decouples data from the power supply network 36 and transfers it to a power line control unit 224. On the other hand, data coming from the power line control unit 224 is coupled into the power supply network 36 through the power line interface 222. The network line interface 222 thus fulfills functions of the physical layer 1 of the OSI model.

The power line control unit 224 is subordinate to the power line control unit 204 and also fulfills functions of layer 2a. These functions include:

- The sending and receiving of data packets.

synchronization to the superframe 150, e.g. using a PLL (Phase Locked Loop) circuit.

- The channel formation when receiving data and the channel assignment when sending data.

Functions in the context of address evaluation and in the context of address assignment.

The network line control unit 224 transfers data to a packaging unit 226, which fulfills functions of layer 2b. In addition, the network line control unit 224 receives data from the packaging unit 226. The packaging unit 226 performs the following functions, among other things: Formation of an IOM2 frame for a bus system 228, which works with the same protocol as the bus system 208.

compressing and decompressing the data for the base channels.

generating the data for the control channels D or evaluating this data.

- monitoring the connection to the power supply network 36.

The bus system 228 leads to a terminal control 230. The terminal control unit 230 is formed by that part of a circuit which is provided for a terminal and which is otherwise used for the direct connection of eight terminals to the telecommunications system 10. The terminal control unit 230 is connected to a UPOE interface 232, to which the connecting line 44 leading to the terminal 24 is connected.

The functions of the packaging unit 226 and the line control unit 224 can also be implemented with the aid of a digital signal processor and with the help of FIFO memories.

The adapter 54 has a structure that is similar to the structure of the adapter 42. Instead of the terminal control unit 230, however, a control unit is used which enables the transmission of computer data.

In another embodiment, the superframe is sent every 125 microseconds. In a UPN packet, either only eight bits with compressed speech data for two basic channels, eight bits with uncompressed speech data for one basic channel or only four bits with compressed speech data for one basic channel-1 are transmitted.

Claims

claims

1. method for transmitting digital data (Bla),

in which digital data (Bla) is generated by at least two transmission units within equally long periods,

in which the digital data (Bla) generated within a period are assigned to a transmission unit as a payload of at least one data packet (120),

in which the data packets (120) receive an address part depending on the recipient, the data of which address the recipient (ADRC),

and in which the data packets (120) for different receivers are transmitted synchronously with the aid of a time-division multiplex method in at least two transmission channels (U0 to U15) on a common transmission medium (36),

one data packet (120) being transmitted in one period in a transmission channel (U0),

and wherein data packets (120) of both transmission units are transmitted in one period.

2. The method according to claim 1, characterized in that the transmission channels (U0 to U15) have the same transmission rates,

and / or that a data packet (120) for the same receiver (24) is transmitted in a transmission channel (U0) in successive periods.

3. The method according to claim 1 or 2, characterized in that a transmitting unit (12) and / or a receiving unit (12) is defined as a higher-level control unit (12),

and that the higher-level control unit (12) controls the assignment of the data packets (120) to the transmission channels (UO to U15),

and / or that the higher-level control unit (12) generates a synchronous mark (LF).

4. The method according to claim 3, characterized in that the higher-level control unit (12) assigns the data packets (120) to the transmission channels (UO to U15) in such a way that a plurality of transmission channels (UO to Uli) used for the transmission of voice data an uninterrupted part of a period,

and that free transmission channels (U14, U15) or transmission channels (U13) used for purposes other than the transmission of voice data are transmitted in another uninterrupted part of the period.

5. The method according to claim 4, characterized in that the higher-level control unit (12) not for the transmission of voice data serving transmission channels (U14, U15) for the transmission of data to or from a computer unit (28) releases or requests,

and that preferably a plurality of transmission channels are assigned to a computer unit (28) at the same time.

6. The method according to any one of claims 3 to 5, characterized in that an address allocation package (100) is used for control,

and that the address allocation package (100) contains: at least one superframe bit (LF) for identifying the position of a time-division multiplex frame with the period,

and / or at least one packet type bit (PT) for identifying the type of packet,

and / or a response bit (AV), the value of which is changed by an added terminal,

and / or several bits (ADRA, ADRB) for receiving an address value for identifying a receiving unit.

7. The method according to any one of the preceding claims, characterized in that a data packet (120) contains:

at least one superframe bit (LF) for identifying the position of at least one time-division multiplex frame with the period,

and / or at least one packet type bit (PT) for identifying the type of packet,

and / or multiple bits (ADRC) for receiving the address of the recipient.

8. The method according to claim 7, characterized in that the data packet (152) contains a bit sequence (162), in which the assignment of the bit positions except for compression according to a compression method corresponds to the assignment of the bit position of a bit sequence (158) which is between a Transmitting unit and a receiving unit is transmitted, which are connected via a transmission medium (30) that can not be used by the second transmitting unit.

9. The method according to claim 8, characterized in that the assignment of the bit positions of the bit sequence (158) is a protocol of the protocol family for the Interface of a telecommunication system to end devices (18 to 26), preferably a protocol for the separate connection of end devices (18 to 22) to the telecommunication system (10), in particular the protocol (UPOE).

10. The method according to any one of the preceding claims, characterized in that it for the transmission of digital data between a telecommunications system

(10) and several terminals (24 to 28) connected via the same transmission medium (36).

11. The method according to claim 10, characterized in that a line network of electrically conductive lines is used as the transmission medium (36), preferably the power supply network.

12. The method according to any one of the preceding claims, characterized in that the bandwidth of the transmission medium (36) is less than two megabits per second.

13. The method according to any one of the preceding claims, characterized in that a synchronization mark (LF) is transmitted, which is preferably repeated after a period,

and / or that at least one bit position in the data packets (120) and / or in the address assignment packets (100) is provided for the synchronization mark (LF).

14. Sending unit (12, 42) for sending digital data,

with a packaging unit (206, 226) which combines digital data into packets within equally long periods, with an address allocation unit (204, 224) which adds an address part with the address of a receiver unit to the packets,

5 with a synchronization unit which synchronizes itself to the periods and initiates the sending of a data packet in a predetermined transmission channel in each period,

and with an interface unit (202, 222) to a transmission medium (36) on which the data packets (120) of a plurality of transmission units are transmitted in time-division multiplexing.

15. Transmitting unit (12, 42) according to claim 14, characterized in that the transmitting unit is constructed 5 such that a method according to one of claims 1 to 13 is carried out during its operation.

16. receiving unit (12, 42),

0 with an interface unit (202, 222) to a transmission medium (36) via which data packets (120) of several transmission units are transmitted in time-division multiplexing, data packets of several transmission units being transmitted in one transmission channel each within a period, 5 a synchronization unit that relate to one another synchronizes the period,

_> with an address assignment unit (204, 224) that detects data packets 0 (120), in the address part (ADRC) of which an address assigned to the receiving unit is contained,

and with an unpacking unit (206, 226) which takes useful data from the recorded data packets (120) and forwards them for further processing.

17. receiving unit (12, 42) according to claim 16, characterized in that the receiving unit (12, 42) is constructed such that a method according to one of claims 1 to 13 is carried out during its operation.

18. Integrated circuit arrangement, characterized in that it contains a transmitting unit and / or a receiving unit according to one of claims 14 to 17.

19. Program with an instruction sequence, when executed by a processor, in particular by a signal processor, a method according to one of claims 1 to 13 is carried out.