Method and apparatus for unifying an EPON access network and a coax-based access network
View Patent ↗A MSO deploying a standard OLT, and installed with ONUs to be used by customers to whom the MSO can connect using optical fiber. For customers that cannot be reached with optical fiber, the MSO deploys a converter between the optical fiber and the coax network so that the MSO can use the same standard OLT, and use CNUs for those customers attached to the coax network.
1. A method of communication, the method comprising:
in a network comprising an Ethernet passive optical network (EPON) optical line terminal (OLT), a plurality of coaxial network units (CNUs), and an optical coax bridge (OCB) comprising a plurality of virtual optical network units (vONUs) each comprising a plurality of logical link identifiers (LLIDs) and having its own MAC address, each vONU uniquely mapped to one CNU:
forming, in the OCB, each of the plurality of vONUs when a respective CNU is admitted to a coax network coupled to the OCB;
converting data transmissions over an optical fiber network to data transmissions over the coax network, and data transmissions of the coax network to data transmissions over the optical fiber network, via said OCB; and
transmitting and receiving the data packets between the OLT and the at least one CNU.
2. The method of claim 1 wherein the OCB performs one or more of:
emulating an optical network unit (ONU) relative to the OLT;
filtering out any data packets from the OLT that are not destined to any of the OCB LLIDs, and keeping and forwarding all data packets that are destined for any of the OCB LLIDs;
controlling the coax network and managing the operation of the coax network;
receiving all the data packets by the OCB from the OLT, storing destined data packets, scheduling time-slots on the coax network, and transmitting the destined data packets to an appropriate CNU;
receiving data packets from the at least one CNU, storing the data packets according the corresponding LLIDs, requesting the OLT for transmission time-slots, waiting for the scheduled time-slots from the OLT, and transmitting the data packets to the OLT; and
operating with varying portions of an RF spectrum.
3. A system for communication, the system comprising:
an Ethernet passive optical network (EPON) optical line terminal (OLT), a plurality of coaxial network units (CNUs), and an optical coax bride (OCB) coupled to the CNU and comprising a plurality of virtual optical network units (vONUs) each comprising a plurality of logical link identifiers (LLIDs) and having its own MAC address, each vONU uniquely mapped to one CNU, said OCB being operable to:
form, in the OCB, each of the plurality of vONUs when a respective CNU is admitted to a coax network coupled to the OCB;
convert data transmissions over an optical fiber network to data transmissions over the coax network, and data transmissions of the coax network to data transmissions over the optical fiber network; and
communicate the data packets between the OLT and the at least one CNU.
4. The system of claim 3 wherein the OCB is operable to perform one or more of:
emulating an optical network unit (ONU) relative to the OLT;
filtering out any data packets from the OLT that are not destined to any of the OCB LLIDs, and keeping and forwarding all data packets that are destined for any of the OCB LLIDs;
controlling the coax network and managing the operation of the coax network;
receiving all the data packets from the OLT, storing destined data packets, scheduling time-slots on the coax network and transmitting the destined data packets to an appropriate CNU; and
receiving data packets from the at least one CNU, storing the data packets according to the corresponding LLIDs, requesting the OLT for transmission time-slots, waiting for the scheduled time-slots from the OLT, and transmitting the data packets to the OLT wherein the OCB comprises a flexible OCB for operating with varying portions of an RF spectrum.
5. A method of data communication, the method comprising:
in a network comprising an Ethernet passive optical network (EPON) optical line terminal (OLT), a plurality of coaxial network units (CNUs), and an optical coax bridge (OCB) comprising a plurality of virtual optical network units (vONUs) each comprising a plurality of logical link identifiers (LLIDs) and having its own MAC address, each vONU uniquely mapped to one CNU:
forming, in the OCB, each of the plurality of vONUs when a respective CNU is admitted to a coax network coupled to the OCB;
converting data transmissions over an optical fiber network to data transmissions over the coax network, and data transmissions over the coax network to data transmissions over the optical fiber network, via said optical coax bridge (OCB); and
transmitting and receiving the data packets between the OLT and the at least one CNU.
6. The method of claim 5 , comprising filtering out, by the OCB, any data packets from the OLT that are not destined to any of the OCB vONUs, and keeping and forwarding all data packets that are destined for any of the OCB vONUs.
7. The method of claim 5 , comprising controlling, by the OCB, the coax network and managing the operation of the coax network.
8. The method of claim 5 , comprising receiving all the data packets destined to any of the vONUs emulated by the OCB, by the OCB from the OLT, storing the received destined data packets, scheduling time-slots on the coax network and transmitting the data packets to an appropriate CNU.
9. The method of claim 5 , comprising receiving data packets from the at least one CNU by the OCB that are destined to the OLT, storing the data packets according the corresponding vONUs and its associated LLIDs, requesting the OLT for transmission time-slots, waiting for the scheduled time-slots from the OLT and transmitting the data packets to the OLT.
10. The method of claim 5 , wherein the OCB comprises a flexible OCB for operating with varying portions of an RF spectrum.
11. A system for data communication, the system comprising
an Ethernet passive optical network (EPON) optical line terminal (OLT), a plurality of coaxial network units (CNUs), and an optical coax bridge (OCB) comprising a plurality of virtual optical network units (vONUs) each comprising a plurality of logical link identifiers (LLIDs) and having its own MAC address, each vONU uniquely mapped to one CNU, the OCB being operable to:
form, in the OCB, each of the plurality of vONUs when a respective CNU is admitted to a coax network coupled to the OCB;
convert data transmissions over an optical fiber network to data transmissions over the coax network, and data transmissions over the coax network to data transmissions over the optical fiber network, via an optical coax bridge (OCB); and
communicate the data packets between the OLT and the at least one CNU.
12. The system of claim 11 , wherein the system comprises one or both of:
a filter for filtering out any data packets from the OLT that are not destined to any of the OCB vONUs, and keeping and forwarding all data packets that are destined for any of the OCB vONUs; and
a controller for controlling the coax network and managing the operation of the coax network by the OCB, the OCB being operable to:
receive all the data packets destined to any of the vONUs emulated by the OCB from the OLT;
store the received destined data packets;
schedule time-slots on the coax network;
transmit the data packets to an appropriate CNU;
receive data packets from the at least one CNU that are destined to the OLT;
store the data packets according the corresponding vONUs and its associated LLIDs;
request the OLT for transmission time-slots; and
wait for the scheduled time-slots from the OLT and transmit the data packets to the OLT.
13. A method of data communication, the method comprising:
in a network comprising an Ethernet passive optical network (EPON) optical line terminal (OLT), at least one second network, and an optical coax bridge (OCB) comprising a plurality of virtual optical network units (vONUs) each comprising a plurality of logical link identifiers (LLIDs) and having its own MAC address, each vONU uniquely mapped to one coaxial network unit (CNU):
forming, in the OCB, each of the plurality of vONUs when a respective CNU is admitted to a second access medium network coupled to the OCB;
converting data transmissions over the first access network comprising, an optical fiber network, to data transmissions over the at least one second access medium network, and data transmissions of the at least one second access medium network to data transmissions over the first access network, via said OCB; and
transmitting and receiving the data packets between the OLT and the network unit of the at least one second access medium network.
14. The method of claim 13 wherein the at least one second access network comprises a member from the group consisting of a c.LINK network, a standardized coaxial cable based network, a WiFi network, a DOCSIS network, a HomePlug network, a HPNA network, and a G.Hn network.