SYSTEM AND METHOD FOR SUPPORTING COMMUNICATIONS BETWEEN SUBCRIBER OPTICAL INTERFACES COUPLED TO THE SAME LASER TRANSCEIVER NODE IN AN OPTICAL NETWORK
A backwards compatible method and system for receiving upstream frames and reflecting the frames downstream to support communications between subscriber optical interfaces (SOIs) coupled to a same laser transceiver node (LTN) are explained. Backwards compatible means that the method or system is compatible with legacy subscriber optical interfaces that do not need any new or modified hardware. The backwards compatible method assigns each legacy SOI a set of Port-IDs to support communications with SOIs on the same optical network. In addition to a backwards compatible method and system, a non-backwards compatible system or method that are not compatible with legacy subscriber optical interfaces 140 is described. According to this method and system, each LTN and SOI would need additional new hardware or software (or both) to support new fields of an optical network protocol that indicate multicast downstream frames originating from another SOI.
1 . A backwards compatible method for receiving upstream frames and reflecting the frames downstream to support communications between subscriber optical interfaces (SOIs) coupled to a same laser transceiver node, the method comprising:
receiving an upstream frame from a subscriber optical interface with a laser transceiver node;
determining if the frame is destined for one of a subscriber optical interface and a device coupled to a subscriber optical interface serviced by the laser transceiver node;
modifying a field within the frame to indicate a multicast communication;
sending the modified frame downstream to each subscriber optical interface coupled to the laser transceiver node, wherein the method is compatible with legacy subscriber optical interfaces.
2 . The method of claim 1 , further comprising at each subscriber optical interface, reviewing the downstream frame and determining if the downstream frame is acceptable for a subscriber optical interface.
3 . The method of claim 2 , wherein determining what subscriber optical interface originated the upstream frame further comprises determining if a Port-ID assigned to a reviewing subscriber optical interface is identical to a Port-ID of the downstream frame.
4 . The method of claim 1 , further comprising receiving a communication that a subscriber optical interface has been coupled to the laser transceiver node, and assigning unique port-IDs to the subscriber optical interface.
5 . The method of claim 2 , wherein determining if the downstream frame is acceptable for a subscriber optical interface further comprises performing a calculation on the Port-ID field of the upstream frame to determine if a reviewing subscriber optical interface is identical to an originating subscriber optical interface.
6 . The method of claim 6 , wherein the calculation comprises subtracting a value from Port-ID field.
7 . A method for receiving upstream frames and reflecting the frames downstream to support communications between subscriber optical interfaces (SOIs) coupled to a same laser transceiver node, the method comprising:
receiving an upstream frame with a laser transceiver node from a subscriber optical interface;
determining if the frame is destined for one of a subscriber optical interface and a device coupled to a subscriber optical interface serviced by the laser transceiver node;
modifying a multicasting-port ID field within the frame to indicate a multicast communication;
sending the modified frame downstream to each SOI coupled to the laser transceiver node wherein each support legacy subscriber optical interface has one of software and hardware to process the multicasting-port ID field.
8 . The method of claim 7 , further comprising determining if any Port-ID of a reviewing subscriber optical interface matches a Port-ID of a multicast frame.
9 . The method of claim 8 , wherein if any Port-ID of a reviewing subscriber optical interface matches a Port-ID of a multicast frame, then dropping the multicast frame.
10 . The method of claim 8 , wherein if any Port-ID of a reviewing subscriber optical interface does not match a Port-ID of a multicast frame, then determining if a MAC address of the multicast frame matches a MAC address of a device coupled to a reviewing subscriber optical interface.
11 . The method of claim 7 , further comprising reviewing the multicast-Port ID field to determine if the downstream frame is a multicast frame.
12 . A method for receiving upstream frames and reflecting the frames downstream to support communications between subscriber optical interfaces (SOIs) coupled to a same laser transceiver node, the method comprising:
receiving an upstream frame with a laser transceiver node from a subscriber optical interface;
determining if the frame is destined for one of a subscriber optical interface and a device coupled to a subscriber optical interface serviced by the laser transceiver node;
modifying a payload type indicator field within the frame to indicate a multicast communication;
sending the modified frame downstream to each SOI coupled to the laser transceiver node, wherein each support legacy subscriber optical interface has one of software and hardware to process the payload type indicator field.
13 . The method of claim 12 , further comprising reviewing the payload type indicator field to determine if the downstream frame is a multicast frame.
14 . The method of claim 12 , further comprising determining if any Port-ID of a reviewing subscriber optical interface matches a Port-ID of a multicast frame.
15 . The method of claim 14 , wherein if any Port-ID of a reviewing subscriber optical interface matches a Port-ID of a multicast frame, then dropping the multicast frame.
16 . The method of claim 14 , wherein if any Port-ID of a reviewing subscriber optical interface does not match a Port-ID of a multicast frame, then determining if a MAC address of the multicast frame matches a MAC address of a device coupled to a reviewing subscriber optical interface.