End-of-burst detection for upstream channel of a point-to-multipoint link
View Patent ↗A method of signaling and detecting end-of-transmission on a data communications link that uses scrambling comprises, by a transmitting node of the network, appending an end of burst delimiter (EBD) binary sequence to burst data and transmitting the burst data and the EBD over the communication link to a headend of the network. In a 10 G EPON using a 64B/66B transmission code, the EBD is exemplarily a 198 bit pattern.
1. A method of signaling end-of-transmission on a data communications link of a point to multipoint (P2MP) network, wherein the data communications link uses scrambling, the method comprising the steps of:
a) by a transmitting node of the network, appending an end of burst delimiter (EBD) binary sequence to scrambled burst data;
b) transmitting the scrambled burst data and the EBD over the data communications link to a headend of the network;
by the headend:
c) detecting the scrambled burst data;
d) synchronizing a headend receiver to the scrambled burst data;
e) checking if the scrambled burst data is unicast interval; and
f) if unicast interval, comparing a current time to an end time of a transmission slot:
(i) if the end time is reached, resetting the headend; and
(ii) while the current time is less than the end time, resetting the headend based on comparing received data to the EBD;
wherein the communication link is an upstream channel of the P2MP network operated in a burst mode, wherein the P2MP network is an Ethernet passive optical network (EPON), wherein the transmitting node is an optical network unit (ONU) and wherein the headend is an optical line terminal (OLT).
2. The method of claim 1 , wherein the EPON is a 10 GEPON using a 64B/66B transmission code and wherein the EBD is a 198 bit pattern.
3. The method of claim 1 , wherein the burst mode is transmitted in a mode selected from unicast transmission and multicast transmission.
4. The method of claim 1 wherein the scrambled burst data is variable length.
5. The method of claim 1 further including the step of:
c) resetting a receiver based on the headend of the network comparing received data to the EBD.
6. The method of claim 5 wherein comparing received data to the EBD is done in tandem with processing the scrambled burst data.
7. A method of signaling end-of-transmission on a data communications link of a point to multipoint (P2MP) network, wherein the data communications link uses scrambling, the method comprising the steps of:
a) by a transmitting node of the network, appending an end of burst delimiter (EBD) binary sequence to scrambled burst data;
b) transmitting the scrambled burst data and the EBD over the data communications link to a headend of the network;
by the headend
c) detecting the scrambled burst data;
d) checking if the scrambled burst data is multicast; and
e) if multicast comparing a first number of blocks received in the scrambled burst data to a second number of blocks required for a maximum length discovery window transmission:
(i) if the first and second numbers are equal, resetting the headend; and
(ii) while the first number of blocks received is less than the second number of blocks, resetting the headend based on comparing received data to the EBD;
wherein the communication link is an upstream channel of the P2MP network operated in a burst mode, wherein the P2MP network is an Ethernet passive optical network (EPON), wherein the transmitting node is an optical network unit (ONU) and wherein the headend is an optical line terminal (OLT).