With the emergence of Distributed Antenna Networks in the 1990's the large carriers experienced similar subscriber growth levels as mobile penetration grow year over year across the United States and the world. The rapid growth for each company led to quickly designed networks and subscribers learned to tolerate patchy networks with huge and ubiquitous coverage holes. Having mobile coverage indoors, especially large office buildings was considered a lucky bonus when it happened, but subscribers usually could manage this, especially since they could fall back on their desk phones for communications indoors.

Now that active DAS nodes make up a larger and larger percentage of traffic in an urban area, they should require the same attention to network monitoring given to regular cell sites (BTS). There are direct costs associated with DAS outages but the most compelling reason is the fact that carriers now compete primarily on network quality and not having coverage where you think you do, will cause significant customer churn.

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