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EPON Uplink and Downlink Technology
Between the OLT and ONU EPON, there is a single optical fiber to provide symmetric 1.25Gbps bandwidth limitations by physical interface, the actual provision of 1Gbps bandwidth to transmit data, voice and video services. EPON in a single fiber using WDM technology, the upper and lower rows of data streams are transmitted in different frequency bands. Among them, is the downstream 1490nm, upstream 1310nm, 1550nm optional for CATV.
Downlink data stream using broadcast, OLT will be 802.3 Ethernet frame format data flow through unicast replication pushed all the way at the ONU; ONU Ethernet frame header by determining where the OLT assigned LLID (Logical Link ID) to determine whether the received data frame received their own, their data will not discard the frame, shown in Figure 1.
ONU Ethernet frame
Upstream data stream using time division multiple access (TDMA) technology, the uplink time into a number of time slices, according to the allocated bandwidth and service ONU priority to the ONU upstream data streams are allocated different time slots, each time point the optical fiber transmission is only one ONU upstream data streams. The negotiation between the OLT and ONU will avoid conflicts of ONU upstream and will not cause data loss, shown in Figure 2.
Negotiation between the OLT and ONU
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