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Troubleshooting a point-to-multipoint fiber-to-the-home (FTTH) network (also defined as a PON network) differs significantly.
The International Telecommunications Union (ITU-T) and Institute of Electrical and Electronic Engineers (IEEE) have created several standards for optical access systems based on PON architecture (G.982, G.983 or G.984 for ITU and 802.3ah or 802.3av for IEEE). As Figure 2 shows, a PON network consists of one optical line terminal (OLT) connected via a splitter to multiple optical network terminals (ONTs) (one for each subscriber, up to 64 subscribers). Sometimes, a second splitter can be connected in cascade to the first splitter (as Figure 3 shows) to dispatch services to buildings or residential areas.