This ensures that existing 1310-nm broadcast levels at the nodes are only reduced marginally after the introduction of a narrowcast wavelength. Care must be taken to ensure narrowcast optical levels at the node are kept 8 dB to 10 dB lower than broadcast optical levels. Average number of homes passed per fiber node. If this average is low, i.e. 300 to 600 homes, the increased number of nodes forces a high number of optical splits for broadcast and narrowcast wavelengths. Thus, higher node counts force not only the activation of additional broadcast lasers, but also initial activation of a higher number of narrowcast lasers.
Available fiber counts.
This is a factor when implementing DWDM designs for return signal transport. High fiber counts between the headend and secondary fiber hubs allow for the allocation of dedicated fibers per return narrowcast laser rather than paying a premium for the purchase of DWDM couplers. Expected initial penetration of targeted services. For markets with high growth potential, consideration must be given to limiting the area served by individual narrowcast wavelengths to 10,000 homes. This may be the case even for 750-MHz systems.