Summary: Josh Gerst and I talk about an introduction to DAS, distributed antenna systems.<br> Welcome back Josh Gerst, Vice President of Engineering at <a href="http://www.rfconnect.com/" target="_blank" rel="nofollow">RF Connect</a>. He originally came on the show back in <a href="http://www.cleartosend.net/josh-gerst-on-outdoor-wireless-and-das/" target="_blank">episode 27</a> and he’s back to talk more about DAS.<br> DAS stands for Distributed Antenna System where you take RF from one location and convert it to light over fiber so it could be distributed throughout a facility.<br> There are many moving parts to consider in a DAS. Some systems use CAT6 cabling and there are traditional DAS systems which use hybrid fiber coax. The hybrid fiber coax method takes multiple RF sources which could be multiple frequency bands. The headend would be used for RF consolidation.<br> Another system is a multi-sector DAS which is used for capacity. These systems often have 3 sectors where each sector is independent and each sector has different scrambling codes.<br> Without getting too far into the weeds and keeping this as an introduction to DAS we talk about stadium deployments. Usually multiple sectors are used in these environments due to capacity reasons. A sector may serve 1 or 10 remote units of 20W or 40W. That’s far from an introduction to DAS but it gives you insight into how this can scale.<br> One thing you cannot overlook with DAS is public safety. E911 is configured for sectors in a tower. Generally phones will log in their GPS on the tower which is then reported to assisted GPS. Public safety generally uses lower frequencies because of the penetration into buildings so we wont typically see it on the Wi-Fi frequencies.<br> For more of an introduction to DAS, check out <a href="http://www.rfconnect.com/" target="_blank" rel="nofollow">RF Connect</a> online and view a couple of videos found online <a href="https://www.youtube.com/watch?v=8LJCy30oztU" target="_blank" rel="nofollow">here</a> and <a href="https://www.youtube.com/watch?v=pT0oCq6rp48" target="_blank" rel="nofollow">here</a>.<br>
