Channel map for optical network unit activation and rogue behavior prevention
View Patent ↗A multi-wavelength passive optical network (MW-PON) includes an optical distribution network (ODN), a plurality of optical line terminations (OLTs) and an optical network unit (ONU). The ODN includes a trunk fiber, one or more branching elements, and a plurality of distribution fibers. Each OLT is associated with an individual bi-directional wavelength channel using a corresponding single downstream wavelength and a corresponding single upstream wavelength, and supporting a specific downstream line rate and one or more distinct upstream line rates. The ONU is communicatively coupled to a respective distribution fiber, being tunable over a specific range of downstream wavelengths and a specific range of upstream wavelengths, and supporting a specific downstream line rate and a specific upstream line rate. The OLT is configured to assemble a broadcast management message conveying information about bi-directional wavelength channels in said MW-PON system and transmit said message downstream over the associated bi-directional wavelength channel.
1. A method implemented at an optical network unit (ONU) for joining an optical distribution network (ODN), comprising:
scanning a tuning range of the ONU to find a signal transmitted over a first channel, wherein finding the signal indicates that the first channel is compatible with the ONU;
tuning to the first channel;
receiving a channel map message and a profile message on the first channel, the channel map message comprising an identifier for the first channel and a plurality of entries for activation channels, wherein the plurality of entries includes at least an entry for the first channel;
acquiring, based on a determination that the first channel is a compatible activation channel using the plurality of entries for activation channels, a channel map and a profile on the first channel based on the channel map message and the profile message; and
discarding, based on a determination that the first channel is an incompatible activation channel using the plurality of entries for activation channels, the acquired profile and tuning to a compatible activation channel selected from the activation channels.
2. The method of claim 1 , further comprising examining a downstream line rate and a supported protocol of the first channel.
3. The method of claim 1 , further comprising:
synchronizing to the signal over the first channel.
4. The method of claim 1 , wherein the channel map message includes a value indicative of a number of wavelength channels supported by the ODN.
5. The method of claim 1 , wherein each entry of the plurality of entries for activation channels includes a downstream wavelength and a downstream line rate of an activation channel corresponding to the entry.
6. The method of claim 1 , wherein each entry of the plurality of entries for activation channels includes an upstream wavelength, an upstream line rate, and an indication of availability of an activation channel corresponding to the entry.
7. An optical network unit (ONU) operable to join an optical distribution network (ODN), comprising:
one or more memories that store code; and
a processor that reads code from the one or more memories to:
scan a tuning range of the ONU to find a signal transmitted over a first channel, wherein finding the signal indicates that the first channel is compatible with the ONU;
tune to the first channel;
receive a channel map message and a profile information message on the first channel, the channel map message comprising an identifier for the first channel and a plurality of entries for activation channels, wherein the plurality of entries includes at least an entry for the first channel;
acquire, based on a determination that the first channel is a compatible activation channel using the plurality of entries for activation channels, a channel map and profile information on the first channel based on the channel map message and the profile message; and
discarding, based on a determination that the first channel is an incompatible activation channel using the plurality of entries for activation channels, the acquired profile information and tuning to a compatible activation channel among the one or more activation channels.
8. The optical network unit of claim 7 , wherein the processor further examines a downstream line rate and a supported protocol of the first channel.
9. The optical network unit of claim 7 , wherein the processor further performs:
synchronizing to the signal over the first channel.
10. The optical network unit of claim 7 , wherein the channel map message includes a value indicative of a number of wavelength channels supported by the ODN.
11. The optical network unit of claim 7 , wherein each entry of the plurality of entries for activation channels includes a downstream wavelength and a downstream line rate of an activation channel corresponding to the entry.
12. The optical network unit of claim 7 , wherein each entry of the plurality entries for activation channels includes an upstream wavelength, an upstream line rate, and an indication of availability of an activation channel corresponding to the entry.