Enhanced optical line terminal controller
View Patent ↗An enhanced optical line terminal (OLT) controller capable of providing traffic processing features. The OLT controller comprises an Ethernet switch operable in a stacking mode and being capable of mapping between Ethernet addresses and passive optical network (PON) addresses. The Ethernet switch is connected to a PON medium access control (MAC) adapter via a stacking port and being capable of processing Ethernet frames relayed on the PON network. The mapping information is kept by the Ethernet switch in a forwarding table.
1. An optical line terminal (OLT) controller capable of providing enhanced traffic processing features, the OLT comprising:
an Ethernet switch operable in a stacking mode and being capable of mapping between Ethernet addresses and passive optical network (PON) addresses and for generating a stacking tag based on the mapping, wherein the stacking tag includes a switch number and a port number, the mapping results in mapping information that includes the association between MAC destination addresses and least one of port-IDs, and logical link IDs (LLIDs), wherein the port-ID and the LLID are determined using switch number and the port number; and
a PON medium access control (MAC) adapter connected to the Ethernet switch via a stacking port and capable of processing Ethernet frames relayed on the PON network.
2. The OLT of claim 1 , wherein the Ethernet switch maintains mapping information of mapping between Ethernet addresses and PON addresses in a forwarding table.
3. The OLT of claim 2 , wherein at least one of: the LLIDs, the port-IDs are encapsulated in a stacking tag.
4. The OLT of claim 3 , wherein the stacking tag further includes a priority tag that defines a quality of service (QoS) assured to customer equipment (CPE) connected to an ONU.
5. The OLT of claim 1 , wherein the PON comprises at least one of: a Gigabit PON (GPON), an Ethernet PON (EPON).
6. The OLT of claim 1 , wherein the enhanced traffic processing features comprise at least one of: aggregation of multiple PON flows, Ethernet QoS, rate limitation, packets multicasting.
7. A method for providing enhanced traffic processing features by an optical line terminal (OLT) controller, the method comprising:
generating a stacking tag based on mapping between Ethernet addresses and passive optical network (PON) addresses, wherein the stacking tag includes a switch number and a port number; and
constructing downstream frames compliant with the PON using address information encapsulated in the stacking tag by:
extracting the switch number and the port number from the stacking tag;
determining a port-ID using the switch number and the port number; and
inserting the port-ID to a header field of a downstream frame.
8. The method of claim 7 , wherein mapping information of mapping between Ethernet addresses and PON addresses comprises at least one of: the association between medium access (MAC) destination addresses and port-IDs, the association between MAC destination addresses and logical link IDs (LLIDs).
9. The method of claim 8 , wherein constructing the downstream frames further comprises:
extracting the switch number and the port number from the stacking tag;
determining a LLID using the switch number and the port number; and
inserting the LLID to a header field of a downstream frame.
10. The method of claim 8 , wherein the stacking tag further includes a priority tag that defines a quality of service (QoS) assured to customer equipment (CPE) connected to an optical network unit (ONU).
11. The method of claim 8 , further comprising learning at least one of port-IDs or LLIDs associated with the PON addresses.
12. The method of claim 11 , wherein learning at least one of port-IDs or LLIDs associated with the PON addresses comprises:
receiving an upstream packet;
extracting a port-ID and an Ethernet source address from the upstream packet;
determining if the port-ID is included in a forwarding table; and
when a respective entry is not found in the forwarding table, inserting the port-ID together with the Ethernet source address to an entry in the forwarding table.
13. The method of claim 12 , wherein the forwarding table includes mapping information between MAC address of each CPE and a port-ID value.
14. The method of claim 13 , wherein the port-ID comprises a LLID.
15. The method of claim 7 , wherein the PON comprises at least one of: a Gigabit PON (GPON), an Ethernet PON (EPON).
16. The method of claim 7 , wherein the enhanced traffic processing features comprise at least one of: aggregation of multiple PON flows, Ethernet QoS, rate limitation, packets multicasting.