Intelligent fiber to the room (FTTR) gateway
A method performed by an optical network unit (ONU) gateway connecting an access passive optical network (PON) and a home PON for rerouting in-home traffic data back to the home PON. The method includes receiving, by the ONU gateway, an access PON downstream optical signal from an optical line terminal (OLT). The access PON downstream optical signal includes first access traffic intended for the ONU gateway and second access traffic not intended for the ONU gateway. The ONU gateway also receives a home PON upstream optical signal from an ONU of the home PON. The home PON upstream optical signal includes in-home traffic data and upstream access data. The ONU gateway generates a composite downstream signal that includes the first access traffic intended for the ONU gateway and the in-home traffic data. The ONU gateway transmits the composite downstream signal to all ONUs of the home PON.
1 . An optical network unit (ONU) gateway configured to couple an access passive optical network (PON) to a home PON, the ONU gateway comprising:
an ONU configured to convert an access PON downstream optical signal to an access PON downstream electrical signal comprising first access traffic and second access traffic, the first access traffic intended for the ONU gateway and the second access traffic is not intended for the ONU gateway;
an optical line terminal (OLT) configured to convert a home PON upstream optical signal to a home PON upstream electrical signal comprising in-home traffic data and upstream access data;
an ONU media access control (MAC) chip coupled to the ONU, the ONU MAC chip configured to filter the access PON downstream electrical signal and remove the second access traffic to generate a filtered access traffic signal; and
a time-division multiplexing (TDM) switching circuit configured to receive one or more control signals from the ONU MAC chip to instruct the TDM switching circuit to generate a composite downstream electrical signal comprising the first access traffic and the in-home traffic data,
the OLT is configured to convert the composite downstream electrical signal to a composite downstream optical signal and transmit the composite downstream optical signal to all ONUs of the home PON.
2 . The ONU gateway of claim 1 , wherein the TDM switching circuit comprises a first input port and a second input port, the first input port configured to receive the filtered access traffic signal, the second input port configured to receive the home PON upstream electrical signal.
3 . The ONU gateway of claim 2 , wherein the TDM switching circuit selects data from the first input port or the second input port to generate the composite downstream electrical signal based on the one or more control signals.
4 . The ONU gateway of claim 1 , wherein the one or more control signals from the ONU MAC chip are based on bandwidth allocation control information included in the access PON downstream optical signal from an OLT.
5 . The ONU gateway of claim 3 , wherein the one or more control signals from the ONU MAC chip instruct the TDM switching circuit to select data from the second input port during a bandwidth timeslot previously allotted to the second access traffic in the access PON downstream optical signal, such that the composite downstream electrical signal utilizes the bandwidth timeslot allotted to the second access traffic for carrying the in-home traffic data.
6 . The ONU gateway of claim 1 , wherein the ONU MAC chip receives a copy of the home PON upstream electrical signal comprising the in-home traffic data and the upstream access data, the ONU MAC chip configured to remove the in-home traffic data from the copy of the home PON upstream electrical signal to generate an access upstream electrical signal comprising the upstream access data.
7 . The ONU gateway of claim 6 , wherein the ONU converts the access upstream electrical signal to an access upstream optical signal, and transmits the access upstream optical signal to the OLT.
8 . The ONU gateway of claim 6 , wherein the OLT is configured to receive the home PON upstream optical signal from an ONU of the home PON.
9 . The ONU gateway of claim 1 , wherein the TDM switching circuit is implemented using an electronically controlled multiplexer switch, wherein the TDM switching circuit electrically connects one of two input ports to an output port.
10 . The ONU gateway of claim 1 , wherein the TDM switching circuit is implemented using a memory buffer having two input ports and one output port, where the two input ports store data into the memory buffer, and the one output port reads out data from the memory buffer.
11 . The ONU gateway of claim 10 , wherein the memory buffer is organized on whole forward error correction (FEC) codewords, and only whole FEC codewords are stored and read from the two input ports of the memory buffer.
12 . A method implemented by an optical network unit (ONU) gateway configured to couple an access passive optical network (PON) and a home PON for rerouting in-home traffic data back to the home PON, the method comprising:
receiving an access PON downstream optical signal from an optical line terminal (OLT), the access PON downstream optical signal comprising first access traffic and second access traffic, the first access traffic intended for the ONU gateway, and the second access traffic is not intended for the ONU gateway;
receiving a home PON upstream optical signal from an ONU of the home PON, the home PON upstream optical signal comprising in-home traffic data and upstream access data;
generating a composite downstream signal comprising the first access traffic and the in-home traffic data; and
transmitting the composite downstream signal to all ONUs of the home PON.
13 . The method of claim 12 , wherein the generating the composite downstream signal comprises analyzing control information included in the access PON downstream optical signal and utilizing the control information to generate the composite downstream signal.
14 . The method of claim 13 , wherein the composite downstream signal utilizes a bandwidth timeslot allotted to the second access traffic for carrying the in-home traffic data.
15 . The method of claim 12 , wherein the generating the composite downstream signal comprises controlling a time-division multiplexing (TDM) switch to generate the composite downstream signal.
16 . The method of claim 15 , wherein the first access traffic is selected when the TDM switch is in a first state, and the in-home traffic data is selected when the TDM switch is in a second state.
17 . The method of claim 16 , further comprising transmitting the upstream access data to the OLT.
18 . A system comprising:
a memory storing instructions;
a receiver for receiving signals;
a transmitter for transmitting signals; and
one or more processors coupled to the memory, the one or more processors configured to execute the instructions to cause the system to:
receive an access passive optical network (PON) downstream optical signal comprising first access traffic intended for the system;
receive a home PON upstream optical signal comprising in-home traffic data;
generate a composite downstream signal comprising the first access traffic and the in-home traffic data; and
transmit the composite downstream signal.
19 . The system of claim 18 , wherein the generating the composite downstream signal comprises analyzing control information included in the access PON downstream optical signal and utilizing the control information to generate the composite downstream signal.
20 . The system of claim 18 , wherein the composite downstream signal utilizes a bandwidth timeslot allotted to second access traffic for carrying the in-home traffic data, wherein the second access traffic is not intended for the system.