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--- onboarding:introduction:introduction_to_das_networks [2017/05/18 12:30] – mmcc
+++ onboarding:introduction:introduction_to_das_networks [2021/06/25 10:09] (current) – external edit 127.0.0.1
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+====== Introduction to DAS Networks ======
+Author: Michelle McCausland
+Excerpts taken from presentation given by Stephen Shotts - Errigal U - Wireless Telecom & DAS Primer - November 2015
+{{ :onboarding:introduction:07_-_errigal_university_-_wireless_telecom_das_primer_2015.pptx |}}
+{{ :onboarding:introduction:videotron_das.jpg?nolink&200 |}}
+**DAS** - Stands for Distributed Antenna Systems
+  * A single traditional “tower” is replaced by smaller, typically fiber-fed, remote amplifiers.
+  * DAS is widely used indoors and outdoors - in hotels, shopping centers, stadiums.
+{{:onboarding:introduction:fake_cactus_cell_towers.jpg?nolink&200|}}
+{{:onboarding:introduction:picture1.png?nolink&200|}}
+**Pros:**
+  * Less loss between amplifier and antenna (requiring lower power).
+  * Signal can be placed more exactly.
+  * Hardware supports “neutral host” configuration.
+**Cons:**
+  * Installation costs are higher compared to an average tower.
+  * Maintenance costs are higher (more nodes, fiber repairs are costly).
+  * Added complexity (multiple vendors and configurations).
+----
+**Currently 74,000 active DAS nodes deployed in the US.**
+**Crown Castle – A traditional tower company**
+  * 28,000 DAS “Nodes” including “Extension Units”
+  * Acquisitions:  Newpath ($115M) and NextG Communications ($1B), as well as other local fiber companies.
+**ExteNet Systems**
+  * 8,000 DAS “Nodes” including “Extension Units”
+  * Acquisitions:  Former Mobilitie DAS assets by way of SBA Communications (tower Co.)
+**Future Customer(s):**
+  * American Tower Company
+  * 8,000 DAS “Nodes” + tower monitoring (lights, generators, etc.)
+  * Other smaller integrators, venue owners, and DAS OEMs
+----
+**DAS OEMs (hardware vendors)**
+  * Commscope (Andrew) – Hardware manufactured in Germany.
+     * Models:  ION-M, ION-B, ION-U, TSUN
+  * TE Connectivity (LGC, ADC, recently acquired by Commscope) – Based in San Jose.
+     * Models: LRCS, Prism, Fusion, Spectrum.
+  * Corning Mobile Access – Primarily only indoor DAS.
+     * Models:  MA1000/2000, CorningOne
+  * BravoTech Internaitonal (BTI) – Errigal worked with them to improve their SNMP Agent.
+  * Powerwave - Out of business, but hardware is still deployed.
+  * SOLiD – Made in Korea.  Offers NOC services out of CA.
+  * Zinwave - Made in UK.  Extremely poor SNMP agent design.
+  * Teko Telecom - Made in Italy.  Deployed in Levi’s stadium.
+NOTE: See the following page for more info on DAS and NON DAS OEMs: [[toolsandtechnologies:oems|OEMs]]
+----
+===== Self Assessment =====
+Assess your knowledge by seeing if you can answer the following questions:
+  - What does the term DAS stand for?
+  - Where are DAS systems used?
+  - What are some advantages of DAS systems? Name 2
+  - What are some dis-advantages of DAS systems? Name 2
+  - Approximately how many DAS nodes are actively used in the US?
+  - Name 3 DAS OEMs

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