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1267 New requirements for EPONs
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As mentioned above, EPONs allow a saving on the number of optics needed when multiple end stations are involved Moreover, it was eluded to that there are a number of additional requirements on these optics Broadly, there are two areas that are different First, the cable speci cations and network topology de nitions are more complex With a P2P solution, there is one topology to connect the two devices and the speci cations or variability are centered on cable loss To the rst order, this is predominantly the number of connectors and length of the ber In a P2MP topology, there is an endless number of ways that a set of end stations can be connected to the CO For instance, the ber from the CO optic can be split at once into the required number of bers for the end stations through one optical splitter, or a tree and branch topology can be used with a number of splitters Moreover, this introduces re ection issues that have to be taken into account Thus, rather than restricting the topologies, a set of optical parameters are used to specify the cable plant Second, the optics are bursty Unlike a point-to-point link, where the optics come up the rst time and are, essentially, on thereafter forever, in a point-to-multipoint system, only the CO optic can continuously transmit in the downstream direction In the upstream direction, the various CPEs have to share the bandwidth via the protocol detailed in the next overview section This requires that the CPE transmitters in the upstream are capable of switching on and stabilizing, as well as switching off, in a controlled and rapid fashion Moreover, the receiver in the CO optic has to be able to adjust rapidly to what could be a widely varying power level in the upstream direction For instance, a CPE could be at a close distance to the CO with a transmitter that is on the high side of the power range, while the next CPE could be at a far distance to the CO with a transmitter that is on the low side of the power range, thus creating a signi cant shift in the power level Again, the receiver needs to adjust in a rapid and controlled fashion
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1268 Optical reach
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With the exception of 1000BASE-LX10 operating over MMF, all the optical devices are speci ed to go at least 10 km A long distance is expected in an access environment, nonetheless, the astute reader may ask why 10 km, and why are there two distance solutions in EPON, 10 km and 20 km The distances were based on data presented by a number of providers and vendors Outside of North America, 10 km seemed to satisfy a great proportion of needs Within North America, it was satisfactory for business loops 20 km, on the other hand, was introduced for residential loops in North America Having two separate options for EPONs allows for the longer reach solution without having to burden the shorter reach solution with the additional cost on the optics
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1269 Extended temperature
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Traditionally, the IEEE had not speci ed a temperature range for its optics which worked well for a mainly enterprise audience In the access space, however, the geographic regions,
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outside plant, business and residential constraints and variations, are endless For instance, some expressed interest in having the CPE device sit outside the home, while others wanted it inside Moreover, some had interest in geographic regions, others in cold, and others in both The optics themselves were speci ed over a fairly large temperature range of 40 C to +85 C Nevertheless, the geographic issues and other constraints would have a cost implication on testing To accommodate all combinations, a low temperature range, high temperature range, the entire range or no range is permitted, with the latter being no different to the previously unspeci ed enterprise optics
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