H - Electricity – 04 – J
Patent
H - Electricity
04
J
H04J 3/16 (2006.01) H04B 7/212 (2006.01) H04L 5/14 (2006.01) H04Q 11/00 (2006.01) H04Q 11/04 (2006.01) H04L 12/56 (2006.01)
Patent
CA 2332387
In a power splitting passive optical network (PSPON) (101) which provides fiber-to-the-home (FTTH), time division multiplexing/time division multiple access (TDM/TDMA) communication is employed for downstream/upstream transmission over a fiber. A framed structure is used for the downstream transmission of ATM cells from an optical line card (OLC) (401) to a (104) in the outside plant and thence to a plurality of optical network units (ONUs) (106) which are each associated with a home or business. The ONU at each home/business is connected to end user terminal equipment such as one or more PCs (109), televisions (111), and telephones (107). The ATM cells transmitted within each fixed length frame may be addressed to a specific ONU for a particular end user terminal, or they may be broadcast to many or all ONUs. An ATM cell may also carry a control channel or messages directed to the ONUs. A framed structure is also employed for upstream burst transmission from the plural ONUs to the OLC. Specifically, in the upstream direction each ONU transmits one burst per frame that includes a header and a payload containing a variable number of bytes. The length of each payload in a burst transmitted upstream by an ONU is determined as a function of the bandwidth requirements of the end user terminal equipment connected to that ONU as well as the bandwidth requirements of the end user terminal equipment at the other ONUs. When the bandwidth requirements at an ONU changes, that information is communicated upstream to the OLC where an upstream bandwidth message is created and transmitted downstream to the ONUs. That upstream bandwidth management message modifies the length of the payload in the burst in a subsequent frame transmitted by that ONU whose bandwidth requirements have changed, and also changes the locations within the frame that the other ONUs transmit their bursts if they transmit in the frame after that payload-length modified ONU.
Kirby Eades Gale Baker
Lucent Technologies Inc.
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