Technique for transferring information in a passive optical network
View Patent ↗A technique for transferring information in a passive optical network is disclosed. The technique may be realized as a method for transferring information in a passive optical network having a plurality of network nodes. The method comprises transmitting a downstream signal during a control/management time slot of a periodic frame having N control/management time slots and M data time slots, wherein the downstream signal includes an identifier of a service node in the network, wherein each of the N control/management time slots corresponds to a respective one of N possible service nodes in the network. The method also comprises responding to the downstream signal with an upstream signal during the control/management time slot of the periodic frame. The method further comprises allocating at least one of the M data time slots of the periodic frame to the service node based at least in part upon the upstream signal.
1. A method for transferring information in a passive optical network having a plurality of network nodes, the method comprising:
transmitting a downstream signal during a control/management time slot of a periodic frame having control/management time slots and data time slots, wherein the downstream signal includes an identifier of a service node in the network, wherein each of the control/management time slots corresponds to a respective service node in the network;
responding to the downstream signal with an upstream signal during the control/management time slot of the periodic frame; and
allocating at least one of the data time slots of the periodic frame to the service node based at least in part upon the upstream signal.
2. The method as defined in claim 1 , wherein the at least one of the data time slots are also allocated to the service node based upon a predetermined allocation of the data time slots.
3. The method as defined in claim 2 , wherein the at least one of the data time slots are also allocated to the service node based upon the number of service nodes in the network.
4. The method as defined in claim 1 , wherein the upstream signal includes a request for a specified number of the data time slots.
5. The method as defined in claim 1 , wherein the upstream signal includes a request for a required number of the data time slots to satisfy a service.
6. The method as defined in claim 1 , wherein the downstream signal is a first downstream signal and the upstream signal is a first upstream signal, further comprising:
transmitting a second downstream signal during the control/management time slot of the periodic frame; and
responding to the second downstream signal with a second upstream signal during the control/management time slot of the periodic frame, wherein the second upstream signal includes a request for a specified number of the data time slots.
7. The method as defined in claim 6 , wherein the at least one of the data time slots are also allocated to the service node based upon the request for the specified number of the data time slots.
8. The method as defined in claim 1 , wherein the downstream signal is a first downstream signal and the upstream signal is a first upstream signal, further comprising:
transmitting a second downstream signal during the control/management time slot of the periodic frame; and
responding to the second downstream signal with a second upstream signal during the control/management time slot of the periodic frame, wherein the second upstream signal includes a request for a required number of the data time slots to satisfy a service.
9. The method as defined in claim 8 , wherein the at least one of the data time slots are also allocated to the service node based upon the request for the required number of the data time slots to satisfy a service.
10. The method as defined in claim 1 , wherein the downstream signal is a first downstream signal and the upstream signal is a first upstream signal, further comprising:
transmitting a second downstream signal during the control/management time slot of the periodic frame; and
responding to the second downstream signal with a second upstream signal during the control/management time slot of the periodic frame, wherein the second upstream signal includes a request for none of the data time slots.
11. The method as defined in claim 1 , wherein there are N control/management time slots and M data time slots, wherein each of the N control/management time slots and each of the M data time slots is 1 microsecond in duration, and wherein N+M=125 such that the periodic frame is 125 microseconds in duration.
12. A system for transferring information in a passive optical network having a plurality of network nodes, the system comprising:
an optical line node for transmitting a downstream signal during a control/management time slot of a periodic frame having control/management time slots and data time slots, and for allocating at least one of the data time slots of the periodic frame to a service based at least in part upon an upstream signal; and
an optical service node for supporting the service, and for responding to the downstream signal with the upstream signal during the control/management time slot of the periodic frame;
wherein the downstream signal includes an identifier of the optical service node in the network, and wherein each of the control/management time slots corresponds to a respective optical service node in the network.
13. The system as defined in claim 12 , wherein the at least one of the data time slots are also allocated to the service based upon a predetermined allocation of the data time slots.
14. The system as defined in claim 13 , wherein the at least one of the data time slots are also allocated to the service based upon the number of optical service nodes in the network.
15. The system as defined in claim 12 , wherein the upstream signal includes a request for a specified number of the data time slots.
16. The system as defined in claim 12 , wherein the upstream signal includes a request for a required number of the data time slots to satisfy the service.
17. The system as defined in claim 12 , wherein the downstream signal is a first downstream signal and the upstream signal is a first upstream signal, wherein:
the optical line node also transmits a second downstream signal during the control/management time slot of the periodic frame; and
the optical service node also responds to the second downstream signal with a second upstream signal during the control/management time slot of the periodic frame, wherein the second upstream signal includes a request for a specified number of the data time slots.
18. The system as defined in claim 17 , wherein the at least one of the data time slots are also allocated to the service based upon the request for the specified number of the data time slots.
19. The system as defined in claim 12 , wherein the downstream signal is a first downstream signal and the upstream signal is a first upstream signal, wherein:
the optical line node also transmits a second downstream signal during the control/management time slot of the periodic frame; and
the optical service node also responds to the second downstream signal with a second upstream signal during the control/management time slot of the periodic frame, wherein the second upstream signal includes a request for a required number of the data time slots to satisfy the service.
20. The system as defined in claim 19 , wherein the at least one of the data time slots are also allocated to the service node based upon the request for the required number of the data time slots to satisfy the service.
21. The system as defined in claim 12 , wherein the downstream signal is a first downstream signal and the upstream signal is a first upstream signal, wherein:
the optical line node also transmits a second downstream signal during the control/management time slot of the periodic frame; and
the optical service node also responds to the second downstream signal with a second upstream signal during the control/management time slot of the periodic frame, wherein the second upstream signal includes a request for none of the data time slots.
22. The system as defined in claim 12 , wherein there are N control/management time slots and M data time slots, wherein each of the N control/management time slots and each of the M data time slots is 1 microsecond in duration, and wherein N+M=125 such that the periodic frame is 125 microseconds in duration.