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Downstream Transmission in GPON
Downstream frames are layering maps data using GTC (GPON Transmission Convergence). GPON frames have different amount of bytes with different transmission rates. The higher the rate and the bigger is the frame. ONE 1.24416Gbps frame is 19440 bytes long, while one 2.48832Gbps frame is 38880 bytes.
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Figure 1. GPON downstream frame format
Figure 1 shows the detailed PCBd (Physical Control Block downstream) explanation. PCBd is located in the beginning of downstream frame, followed by the payload containing GEM frames or ATM cells. Sometimes payload might contain both types, if so the amount of ATM cells is specified in the ALen field of PCBd. In the payload ATM cells always go first and GEM frames go second. PCBd fields are explained in the Table 1 below.
Table 1. PCBd fields
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