Multi-carrier frequency-division multiplexing (FDM) architecture for high speed digital service
View Patent ↗An architecture for providing high-speed access over frequency-division multiplexed (FDM) channels allows transmission of ethernet frames and/or other data across a cable transmission network or other form of FDM transport. The architecture involves downstream and upstream FDM multiplexing techniques to allow contemporaneous, parallel communications across a plurality of frequency channels. Furthermore, the architecture allows a central concentrator to support a plurality of remote devices that each have guaranteed bandwidth through connection-oriented allocations of bi-directional data flows. The upstream and downstream bandwidth allocation can support symmetrical bandwidth as well as asymmetrical bandwidth in either direction. The architecture generally can be used to support connection-oriented physical layer connectivity between a remote device and the central concentrator. Furthermore, the architecture may be integrated into other higher level devices such as, but not limited to, bridges, switches, routers, and/or gateways. The architecture generally may peacefully coexist with other services commonly-found in cable distribution networks.
1. A method of facilitating connection-oriented, bi-directional communication between a first device and a second device over at least three frequency channels of a cable transmission network, the method comprising the steps of:
providing at least two first frequency channels to facilitate a first direction of communication from the first device to the second device;
providing at least one second frequency channel to facilitate a second direction of communication from the second device to the first device, the second direction of communication being in an opposite direction to the first direction of communication;
communicating first direction frames in the first direction, the first direction frames being fragmented to allow contemporaneous communication of portions of the first direction frames over the at least two first frequency channels; and
communicating second direction frames in the second direction, the second direction frames communicated over the at least one second frequency channel;
wherein a first portion of the first direction frames and the second direction frames are Ethernet/802.3 frames, the Ethernet/802.3 frames comprising a first start frame delimiter, and
wherein a second portion of the first direction frames and the second direction frames are control frames, the control frames comprising a second start frame delimiter different from the first start frame delimiter.
2. The method of claim 1 , further comprising the step of multiplexing the portions of the first direction frames.
3. The method of claim 2 , further comprising the step of receiving an intended portion of the first direction frames based on an appropriate start frame delimiter.
4. The method of claim 1 , wherein each of the at least one first frequency channels utilize a different amount of frequency bandwidth from the at least one second frequency channel.
5. The method of claim 1 , wherein the cable transmission network carries other services in addition to the bi-directional communication between the first device and the second device.
6. The method of claim 5 , wherein the other services comprise video, voice, and data signals.
7. The method of claim 1 , wherein the cable transmission network carries a plurality of bi-directional communication between the first device and the second device.
8. The method of claim 7 , wherein the plurality of bi-directional communications is at least one of Ethernet/802.3, packetized real-time services, and control data.
9. A device for facilitating connection-oriented, bi-directional communication between a first device and a second device over at least three frequency channels of a cable transmission network, the device comprising:
logic configured to provide at least two first frequency channels to facilitate a first direction of communication from the first device to the second device;
logic configured to provide at least one second frequency channel to facilitate a second direction of communication from the second device to the first device, the second direction of communication being in an opposite direction to the first direction of communication;
logic configured to communicate first direction frames in the first direction, the first direction frames being fragmented to allow contemporaneous communication of portions of the first direction frames over the at least two first frequency channels; and
logic configured to communicate second direction frames in the second direction, the second direction frames communicated over the at least one second frequency channel;
wherein a first portion of the first direction frames and the second direction frames are Ethernet/802.3 frames, and
wherein a second portion of the first direction frames are control frames, wherein the Ethernet/802.3 frames and the control frames comprise delimiter start frame delimiters.
10. The device of claim 9 , further comprising a multiplexer for multiplexing the first and second portions of the first direction frames.
11. The device of claim 9 , wherein each of the at least one first frequency channels utilize a different amount of frequency bandwidth from the at least one second frequency channel.
12. The device of claim 9 , wherein the cable transmission network carries other services in addition to the bi-directional communication between the first device and the second device.
13. The device of claim 12 , wherein the other services include video, voice, and data signals.
14. The device of claim 9 , wherein the bi-directional communications is at least one of Ethernet/802.3, packetized real-time services, and control data.