6.4 Ethernet 399 Point-to-point Bus Star Mesh Figure 6.14 Ethernet topologies. GFP Client-Specific Aspects A client-specific function is the mapping of client signals to a GFP frame using a frame mapped GFP (GFP-F) or a transparent mapped GFP (GFP-T). As we mentioned earlier, a GFP-F frame is an encapsulation of a client packet. Transparent mapped GFP is a little more complicated. First, note that it is applicable to fixed-length packets that are encoded by (8,10) line codes. Note that the line code of the client signal is unnecessary for GFP transport because GFP frames have their own frame synchronization. Thus, the GFP-T mapping will first extract the data bytes and