Method and apparatus for redundant transmission over TDMA optical networks
View Patent ↗Communication between a burst manager and plural remote terminals over a first passive optical network (PON) and a second PON, with each PON having a downstream portion and an upstream portion, includes transmitting a common synchronization signal from the burst manager to the plural remote terminals over both downstream PON portions and transmitting burst data from the plural remote terminals over both upstream PON portions to the burst manager. The burst data for each remote terminal is delayed on the first and second PONs by corresponding first and second delays. The first delay includes a first ranging delay and the second delay includes a second ranging delay wherein the first and second ranging delays for each remote terminal are adjusted with respect to the common synchronization signal such that the burst data for any particular remote terminal transmitted on the first PON arrives at the burst manager simultaneously with the burst data for that particular remote terminal transmitted on the second PON in the same relative timeslot position.
1. A method of communicating between a burst manager and plural remote terminals over a first passive optical network (PON) and a second PON, each PON having a downstream
portion and an upstream portion, the method comprising:
transmitting a common synchronization signal from the burst manager to the plural remote terminals over both downstream PON portions;
transmitting burst data from the plural remote terminals over both upstream PON portions to the burst manager, the burst data for each remote terminal being delayed on
the first PON by a corresponding first delay and being delayed on the second PON by a corresponding second delay, the first delay comprising a first ranging delay and the second delay comprising a second ranging delay wherein the first and second ranging delays for each remote terminal are adjusted with respect to the common synchronization signal such that the burst data for any particular remote terminal transmitted on the first PON arrives at the burst manager simultaneously with the burst data for that particular remote terminal transmitted on the second PON, wherein transmitting burst data includes transmitting burst data in TDMA timeslots such that corresponding timeslots on both PONs for each remote terminal are received at the burst manager aligned and in the same relative timeslot position and further comprising examining data received in the corresponding timeslots on both PONs at the burst manager to determine which timeslots contain valid data selecting a valid data on a per timeslot basis.
2. The method of claim 1 wherein the first and second PONs are configured as counter-rotating quasi-rings.
3. The method of claim 1 wherein transmitting the common synchronization signal from the burst manager includes transmitting the common synchronization signal in a downstream TDM signal over both downstream PON portions.
4. A method of communicating between a burst manager and plural remote terminals over a first passive optical network (PON) and a second PON, each PON having a downstream
portion and an upstream portion, the method comprising:
transmitting a common synchronization signal from the burst manager to the plural remote terminals over both downstream PON portions;
transmitting burst data from the plural remote terminals over both upstream PON portions to the burst manager, the burst data for each remote terminal being delayed on
the first PON by a corresponding first delay and being delayed on the second PON by a corresponding second delay, the first delay comprising a first ranging delay and the second delay comprising a second ranging delay wherein the first and second ranging delays for each remote terminal are adjusted with respect to the common synchronization signal such that the burst data for any particular remote terminal transmitted on the first PON arrives at the burst manager simultaneously with the burst data for that particular remote terminal transmitted on the second PON wherein the first and second PONs are configured as uni-directional quasi-rings.
5. The method of claim 4 , wherein transmitting the common synchronization signal from the burst manager includes transmitting the common synchronization signal in a downstream TDM signal over both downstream PON portions.
6. A communication system comprising:
a first passive optical network (PON) having a downstream portion and an upstream portion;
a second passive optical network (PON) having a downstream portion and an upstream portion;
a burst manager coupled to the first and second PONs, the burst manager transmitting a common synchronization signal over both downstream PON portions; and
a plurality of remote terminals coupled to the first and second PONs for communicating with the burst manager, each remote terminal transmitting burst data over both upstream PON portions to the burst manager, the burst data for each remote terminal being delayed on the first PON by a corresponding first delay and being delayed on the second PON by a corresponding second delay, the first delay comprising a first ranging delay and the second delay comprising a second ranging delay wherein the first and second ranging delays for each remote terminal are adjusted with respect to the common synchronization signal, such that the burst data for any particular remote terminal transmitted on the first PON arrives at the burst manager simultaneously with the burst data for that particular remote terminal transmitted on the second PON wherein the remote terminals transmit burst data in the TDMA timeslots and the first and second ranging delays include a corresponding timeslot offset such that corresponding timeslots on both PONs for each remote terminal are received at the burst manager aligned and in the same relative timeslot position and wherein the burst manager examines data received in the corresponding timeslots on both PONs to determine which timeslots contain valid data and selects valid data on a per timeslot basis.
7. The system of claim 6 wherein the first and second PONs are configured as counter-rotating quasi-rings.
8. The system of claim 6 wherein the burst manager transmits the common synchronization signal in a downstream TDM signal over both downstream PON portions.
9. A communication comprising:
a first passive optical network (PON) having a downstream portion and an upstream portion;
a second passive optical network (PON) having a downstream portion and an upstream portion;
a burst manager coupled to the first and second PONs, the burst manager transmitting a common synchronization signal over both downstream PON portions; and
a plurality of remote terminals coupled to the first and second PONs for communicating with the burst manager, each remote terminal transmitting burst data over both upstream PON portions to the burst manager, the burst data for each remote terminal being delayed on the first PON by a corresponding first delay and being delayed on the second PON by a corresponding second delay, the first delay comprising a first ranging delay and the second delay comprising a second ranging delay wherein the first and second ranging delays for each remote terminal are adjusted with respect to the common synchronization signal such that the burst data for any particular remote terminal transmitted on the first PON arrives at the burst manager simultaneously with the burst data for the particular remote terminal transmitted on the second PON, wherein the first and second PONs are configured as uni-directional quasi-rings.
10. The system of claim 9 wherein the burst manager transmits the common synchronization signal in a downstream TDM signal over both downstream PON portions.