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January 2003 - Paradyne's customers are not relying on problematic HPNA equipment to satisfy important guest connectivity needs. Install BitStorm ADSL solutions and connect your guests with confidence!

Deploying high-speed services in the Hospitality and other in-building environments (MxU) is not as easy as many assume. There are many demands on the distribution network in a hotel complex that greatly tax the performance of the access technology. A service provider and the building management or ownership group must carefully consider the trade-offs between the initial costs incurred (purchase and installation), performance, and long-term reliability when choosing an access platform.

The following is a brief discussion of two examples of access technology, Home Phone Line Network Alliance (HPNA) and Asynchronous Digital Subscriber Line (ADSL) and their suitability for MxU deployment.

The electrical conditions of a hotel or apartment building facility can be surprisingly hostile to communications networks. Some of the more prevalent issues that may be present in the cable riser are:

  • Poor inside wiring: It is not uncommon to find poor quality wiring installed. Many older buildings will still have CAT 1 or CAT 2 wiring, or even uncategorized wire, depending on age.
  • Bridged taps: Many buildings were constructed before Structured Wiring was conceived, and the distribution of inside wiring can be veritable ratís nest of bridged taps, feeding from one floor to another, multiple hallway feeds, and looped through multiple wiring closets or pull boxes.
  • Wire gauge changes: Any time two different wire gauges are spliced together in a circuit, a reflection point is introduced, which is noticeably more severe at the high frequencies required by broadband services.
  • Highjoints: A splice point or connection point that has corroded over time and now introduces a higher impedance and poor transmission quality.
  • Electromagnetic Induction: Spurious noise spikes can be induced into the communications network by myriad devices present in a hotel. Elevator motors, heating and air conditioning systems, fluorescent lighting, and dimmer switches are just a few.
  • All of these disturbers can affect the performance of broadband access to some degree. How well the technology performs in the presence of these impairments is fundamental to its design. This factor should be carefully considered when deciding on a platform to be used in a hotel or apartment building where high quality, reliable service is desired for the guests, residents and staff.
Public network, carrier grade performance was a hallmark of design for ADSL from the very beginning. ADSL deployments have been grounded in high reliability, long loop reach, and high performance design. Improvements in ADSL technology continue as integration and performance improvements are included into new versions of ADSL standards and chip sets.

Conversely, HPNA was designed as a short reach, multipoint system for a single residence. HPNA was not designed for in-building riser deployments. HPNA has not demonstrated consistent performance on all in-building lines due to sensitivity to bridged taps and other interference found in the building.

ADSLís performance advantage relative to HPNA for MxU applications is due to its use of spectrum. First, ADSL is attenuated much less than HPNA in the run from the basement to the endpoint location. Second, ADSL is much less susceptible to wiring disturbances along the riser and at the endpoint location.

The figure shown below demonstrates the advantage that ADSL has over HPNA in frequency placement and also total power. The ADSL pass-band (left) is in the lower frequency range from 138kHz to 1.104 MHz. The HPNA pass-band (two smaller lobes on right) is from 4MHz to 10 MHz with a notch at about 7 MHz. ADSL is less susceptible to attenuation and disturbance effects.

HPNA has historically been attractive for High Speed Internet Access (HSIA) deployments because of the low cost, but 100% coverage in a hotel or apartment complex may not be achievable. In addition, the labor effort for installation and equipment required to try to reach uncovered rooms will quickly overshadow the price differential HPNA has previously held over ADSL systems.

ADSL continues to be deployed on a world-wide basis and chip set vendors and equipment manufacturers have continued to reduce the equipment costs. The same cannot be said for HPNA. Although the HPNA standards continue to evolve, there are very few chip set vendors and equipment manufacturers that have been producing new equipment based on these new standards. This is especially true for systems that must be designed for multi-dwelling environments such as hotels and apartment complexes.

The deployment of an ADSL based system will insure that all rooms in a hotel or all apartments can be reached with broadband services, even in a campus topology. ADSL offers the advantage of a standards based technology with very low cost CPE modems that continues to evolve and improve in both performance and costs.

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Paradyne (NASDAQ: PDYN) develops, manufactures, and markets network equipment to enable voice and high speed data over existing telecommunication infrastructure, worldwide. With headquarters and manufacturing in Largo, Florida USA, the company's products are used in over 90 countries, powering hundreds of telephone companies' data networks and over half the Fortune 500 enterprise networks.



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