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NTS COMMUNICATIONS BUILDS NEXT GENERATION PON

After helping design and build passive optical networks (PON) for 10 towns since 1999, Vince Smith has learned a thing or two about fiber to the premises (FTTP) projects. By the time he was hired in 2003 by Texas-based NTS Communications as an outside plant engineer, Smith had acquired good experience with different architectures as well as with products from different vendors. Just four or five years of experience made Smith an “old hand” in the business—and a valuable part of the NTS business plan for delivering POTS, cable TV and high-speed Ethernet services to residential and business customers in west Texas | CASE STUDY SITUATION After helping design and build passive optical networks PON for 10 towns since 1999 Vince Smith has learned a thing or two about fiber to the premises FTTP projects. By the time he was hired in 2003 by Texas-based NTS Communications as an outside plant engineer Smith had acquired good experience with different architectures as well as with products from different vendors. Just four or five years of experience made Smith an old hand in the business and a valuable part of the NTS business plan for delivering POTS cable TV and high-speed Ethernet services to residential and business customers in west Texas. Before joining NTS Smith s first PON design utilized two fibers in a cascaded architecture with 1x8 splitters in outside plant enclosures serving 1x4 and 1x8 splitters in access terminals near homes. Even as his PON designs migrated to one-fiber systems for projects in successive towns splitters were still deployed in the outside plant in a cascaded not centralized manner. On the upside each of Smith s cascaded systems still operates well as far as service delivery. Yet these early-generation systems have shown certain limitations. For instance the distributed splitting of signals in cascaded PONs requires fully populated shelves of optical line terminal OLT cards. Without a 100 take rate the cascaded PON architecture leaves many OLT cards only partially utilized. Cascaded systems which can show poor overall loss measurements also tend to make testing and troubleshooting more difficult and time consuming. There is always opportunity for improvement. Once Smith joined NTS he was on the hunt for ideas for building a better fiber distribution network for FTTP applications. CASE STUDY A MOMENT OF DISCOVERY Wandering the floor of the FTTH Council conference in New Orleans Smith noticed several vendors pitching a new approach to PONs that centralizes splitters. The premise of this centralized architecture was simple make it easy and cost-effective to