<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">telecommunication systems</topic></authority><related type="narrower"><topic>police communication systems</topic></related><related type="narrower"><topic>telephone systems</topic></related><related type="narrower"><topic>telecommunication systems components</topic></related><related type="narrower"><topic>television</topic></related><related type="narrower"><topic>radio</topic></related><related type="narrower"><topic>intranets</topic></related><related type="narrower"><topic>wireless sensor networks</topic></related><related type="narrower"><topic>telex</topic></related><related type="other"><topic>telecommuting</topic></related><related type="other"><topic>telecommunications</topic></related><related type="other"><topic>televillages</topic></related><related type="broader"><topic>infrastructural systems</topic></related><variant type="other"><topic>communication systems</topic></variant><variant type="other"><topic>systems, telecommunication</topic></variant><variant type="other"><topic>telecommunication networks</topic></variant><variant type="other"><topic>telecommunication system</topic></variant> <note xml:lang="en"><![CDATA[ Systems for communicating at a distance, often a collection of individual communications networks, transmission systems, relay stations, subsidiary stations, data terminal equipment, and other facilities for disseminating information. Examples include telephone, telegraph, radio, television, optical communications, internet, etc. ]]></note></mads>