TEL 355: Communication and Information Systems in Organizations Extending ADSL Services to Remote Digital Loop Carrier (DLC) Locations Professor John F.

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Presentation transcript:

TEL 355: Communication and Information Systems in Organizations Extending ADSL Services to Remote Digital Loop Carrier (DLC) Locations Professor John F. Clark

Definitions Digital Loop Carriers (DLCs) consolidate the voice traffic of remotely located customers onto a few lines running to a CO. Asymmetric Digital Subscriber Line (ADSL) will transport large amounts of data traffic at high speeds over existing copper twisted pairs while simultaneously supporting Plain Old Telephone Service (POTS)

The Problem Suburban and rural areas are experiencing rapid residential and business growth. Demand for ADSL in these areas is growing. Delivering ADSL to DLC customers is difficult for a number of technical reasons. Solutions are being developed – each has its advantages and disadvantages, depending on the individual situations.

Market Demand for ADSL In general, demand for data-intensive network-based applications is rising. DLC (suburban) customers are prime candidates for ADSL and represent a lucrative source of revenue for service providers. The number of ADSL lines nationally was expected to grow over 6,000% over four years (1999). End of 2006 – the rate of subscriber growth of DSL was one and a half times cable broadband. DSL subscribers are expected to exceed cable subscribers by early 2008.

The Challenge, Part I Legacy DLC systems were built to provide high-quality voice service. They can’t support the amount of bandwidth required by ADSL Newer DLC systems can support the bandwidth, but at the cost of seriously constraining the capacity for phone service. Plus, newer DLC systems are not engineered for data transmission, anyway.

The Challenge, Part II The incidence of legacy DLC systems (pre- 1990) outnumbers new DLC systems 4:1. Legacy DLCs can supply only 64 kbps per subscriber line because of their sample rate. Plus, the basic structure does not allow the entire DLC to support more bandwidth than a single T1 line.

The Challenge, Part III ADSL is designed to use existing copper pairs to deliver both ADSL and POTS. But legacy DLC systems will not support the data-intensive bandwidth. The solution has been the installation of a completely separate system – the Digital Subscriber Line Access Multiplexer (DSLAM) – no connection to the DLC.

Solution Options There are three primary solutions to ADSL/DLC problem: Remote DSLAM solutions –Highly scalable but very costly ADSL line-card solutions –Cost-effective but causes technical problems Remote-Access Multiplexer (RAM) solutions –Combines the strengths of the first two and minimizes the drawbacks