Data transmission method and a network element
First Claim
1. A method, comprising:
- transmitting data over a data transmission network from a first circuit switched transmission line through a first circuit switched network node towards a second circuit switched network node that is coupled to a second circuit switched transmission line;
employing, in the data transmission network, an IP protocol for transmissions from said first circuit switched network node, which receives data from said first circuit switched transmission line, towards said second circuit switched network node, said data being destined for transmission into said second circuit switched transmission line;
using an IP protocol datagram to transmit data received from the first circuit switched transmission line towards the second network node;
forming a header for said IP protocol datagram based at least partly on circuit switched channel identifying parameters, which identify at least one channel in the second circuit switched transmission line, and an IP protocol address of the second network node; and
indicating within said IP protocol datagram separately for each of a plurality of time slots known to at least one of said first and second circuit switched network nodes, whether the IP protocol datagram carries data belonging to a channel corresponding to the time slot, and when it is indicated that the IP protocol datagram does not carry data belonging to the channel, the second circuit switched network node enables the reception of data to that channel from other sources from an IP-network in a non-consecutive manner.
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Accused Products
Abstract
The invention is concerned with transmission of speech information over mixed networks, particularly over a segment using packet transmission in an otherwise circuit switched data transmission network. According to the invention, PCM transmission lines are connected with a packet based network such as an IP network in such a way, that data from one or more channels of a first PCM transmission line is collected in the payload part of a data packet. Further, the destination address of the data packet is constructed in such a way, that the packet network entity being connected to the second PCM transmission line can determine based on the destination address of the packet, to which channel or channels of the second PCM transmission line the data should be transmitted.
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Citations
25 Claims
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1. A method, comprising:
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transmitting data over a data transmission network from a first circuit switched transmission line through a first circuit switched network node towards a second circuit switched network node that is coupled to a second circuit switched transmission line; employing, in the data transmission network, an IP protocol for transmissions from said first circuit switched network node, which receives data from said first circuit switched transmission line, towards said second circuit switched network node, said data being destined for transmission into said second circuit switched transmission line; using an IP protocol datagram to transmit data received from the first circuit switched transmission line towards the second network node; forming a header for said IP protocol datagram based at least partly on circuit switched channel identifying parameters, which identify at least one channel in the second circuit switched transmission line, and an IP protocol address of the second network node; and indicating within said IP protocol datagram separately for each of a plurality of time slots known to at least one of said first and second circuit switched network nodes, whether the IP protocol datagram carries data belonging to a channel corresponding to the time slot, and when it is indicated that the IP protocol datagram does not carry data belonging to the channel, the second circuit switched network node enables the reception of data to that channel from other sources from an IP-network in a non-consecutive manner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A network element, comprising:
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a first connection for connecting to a first circuit switched transmission line; a second connection for connecting to a data transmission network employing an IP protocol, and a hardware processor configured to implement an IP protocol address generating unit for generating IP protocol addresses for IP protocol datagrams to be transmitted over said data transmission network to a second network element; wherein said IP protocol address generating unit is configured to form a header of an IP protocol datagram based at least partly on circuit switched channel identifying parameters, which identify at least one channel in a second circuit switched transmission line coupled to the second network element, and an IP protocol address of the second network element; and wherein the network element is configured to indicate within said IP protocol datagram separately for each of a plurality of time slots known to at least one of said first and second network elements, whether the IP protocol datagram carries data belonging to a channel corresponding to the time slot, and when it is indicated that the IP protocol datagram does not carry data belonging to a channel, the second circuit switched packet network element enables the reception of data to that channel from other sources from an IP-network in a non-consecutive manner. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method, comprising:
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receiving data over a data transmission network, said data coming from a first circuit switched transmission line through a first circuit switched network node, at a second circuit switched network node that is coupled to a second circuit switched transmission line; employing, in the data transmission network, an IP protocol for transmissions from said first circuit switched network node to said second circuit switched network node, said data originating from said first circuit switched transmission line and being destined for transmission into said second circuit switched transmission line; using an IP protocol datagram to receive data transmitted from the first circuit switched transmission line at the second network node; reading a header from said IP protocol datagram, said header being based at least partly on circuit switched channel identifying parameters, which identify at least one channel in the second circuit switched transmission line, and an IP protocol address of the second network node; and reading from said IP protocol datagram an indication separately for each of a plurality of time slots known to at least one of said first and second circuit switched network nodes, whether the IP protocol datagram carries data belonging to a channel corresponding to the time slot, and when it is indicated that the IP protocol datagram does not carry data belonging to the channel, the second circuit switched network node enables the reception of data to that channel from other sources from an IP-network in a nonconsecutive manner. - View Dependent Claims (21, 22, 23, 24)
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25. A second network element, comprising:
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a first connection for connecting to a data transmission network employing an IP protocol, a second connection for connecting to a second circuit switched transmission line, and a hardware processor configured to implement an IP protocol address reading unit for reading IP protocol addresses from IP protocol datagrams received over said data transmission network from a first network element; wherein said IP protocol address reading unit is configured to read a header from an IP protocol datagram based at least partly on circuit switched channel identifying parameters, which identify at least one channel in the second circuit switched transmission line coupled to the second network element, and an IP protocol address of the second network element; and wherein the network element is configured to read from said IP protocol datagram an indication separately for each of a plurality of time slots known to at least one of said first and second network elements, whether the IP protocol datagram carries data belonging to a channel corresponding to the time slot, and when it is indicated that the IP protocol datagram does not carry data belonging to a channel, the second circuit switched packet network element enables the reception of data to that channel from other sources from an IP-network in a non-consecutive manner.
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Specification