{"id":2155,"date":"2011-05-10T11:29:30","date_gmt":"2011-05-10T15:29:30","guid":{"rendered":"http:\/\/www.engineeringradio.us\/blog\/?p=3928"},"modified":"2023-04-30T12:43:21","modified_gmt":"2023-04-30T16:43:21","slug":"wireless-lan-bridges-and-stls","status":"publish","type":"post","link":"https:\/\/www.engineeringradio.us\/blog\/2011\/05\/wireless-lan-bridges-and-stls\/","title":{"rendered":"Wireless LAN bridges and STLs"},"content":{"rendered":"\n

Wireless LAN<\/a> technology has been around for quite a while. \u00a0Point-to-point 2.4 and 5.8 GHz spread spectrum<\/a> hardware has also been around for some time. \u00a0These systems operate in the ISM bands<\/a> at relatively low power levels and are license free. \u00a0There are several different makes and models, however, they all have some similar specifications. \u00a0Most have DS-1 (T-1) or ethernet 10 base T or 100 base T 802.3 architecture. \u00a0Some are field configurable for either format.<\/p>\n\n\n\n

The advantage of using 802.3 ethernet is the availability of ethernet sound cards and the possibility of making inexpensive audio to ethernet A\/D converter. \u00a0However, if a station is currently using telephone company DS-1 service, then they likely have the audio to DS-1 multiplexers on hand.<\/p>\n\n\n

\n
\"Axxcelera<\/a>
Axxcelera AB Full Access outdoor unit<\/figcaption><\/figure>\n<\/div>\n\n\n

I have used the Axxcelera<\/a> point to point system as an inter-city relay for a satellite downlink. \u00a0Axxcelera is owned by Moseley, which has a long history in the STL business. \u00a0The point-to-point system has an indoor unit, which has the RJ-45 ports, and an outdoor unit, which has the RF section and an integrated antenna. \u00a0The two units are connected via Cat 5 cable (be sure to use UV resistant cable) through a power injection port. \u00a0The newer units do not need the power injection port. \u00a0The system gain is about +46 dBm and the claimed effective range is 20 miles. \u00a0I’d suspect it to be somewhat less than that with the integrated antenna. \u00a0There is also an N connector for an external antenna, making the outdoor unit a MMA (Mast Mounted Amplifier).<\/p>\n\n\n\n

The indoor unit came configured with four 10 base T ports, which we reconfigured for DS-1 service. \u00a0We connected a QEI CATLINK T-1 mux with several 7.5 KHz audio channels and one control channel connected to a broadcast tool DSC 3264 (Starguide satellite receiver channel controller) that allowed the station to change channels on the fly. \u00a0It took some doing, but in the end, the system worked well. \u00a0The path was about 1\/2 mile through downtown buildings, it was line of sight but did not have full Fresnel clearance. \u00a0I never heard of any dropouts.<\/p>\n\n\n\n

The other system that I have used is the ADTRAN TRACER<\/a>. \u00a0This system is different in that it does not have an integrated antenna, an external antenna is required. \u00a0We installed this over an eight-mile path using two six-foot grid parabolic dishes (Radio Waves G6-2.4NF) on 2.4 GHz. \u00a0The primary configuration is a rack-mounted indoor unit with either four or eight 802.3, E-1, or T-1 ports. \u00a0These ports are not field configurable. \u00a0The antenna connector is a type N. \u00a0There is also a split configuration available; an indoor unit with the T-1 ports and an outdoor MMA. \u00a0This setup is best used where transmission line lengths would create prohibitive losses. \u00a0MMA’s are not my first choice in these systems, there are too many things that can go wrong when active components are mounted high above ground level.<\/p>\n\n\n\n

This system replaced two Telephone company T-1 lines and is used as an STL for two stations and an inter-city relay for a satellite downlink site. \u00a0It also extends the office LAN (802.3 ethernet) to the transmitter site where a backup audiovault server lives. \u00a0This is accomplished through a T-1 port using an ethernet to T-1 bridge.<\/p>\n\n\n\n

\"ADTRAN<\/a>
ADTRAN Tracer 6000 series microwave radio<\/figcaption><\/figure>\n\n\n\n

ADTRAN also created a path analyser spreadsheet.<\/p>\n\n\n\n

The license-free aspect of these system makes them easy to deploy. \u00a0There are several frequency plans available and the paths are fairly robust. \u00a0In highly congested areas, however, interference may become an issue. \u00a0Of course, because they are unlicensed, frequency coordination would be a real problem. \u00a0Axxcelera has the ExcelFlex which is a unit requiring a license that can run in any frequency band from 6-38 GHz<\/p>\n","protected":false},"excerpt":{"rendered":"

Wireless LAN technology has been around for quite a while. \u00a0Point-to-point 2.4 and 5.8 GHz spread spectrum hardware has also been around for some time. \u00a0These systems operate in the ISM bands at relatively low power levels and are license free. \u00a0There are several different makes and models, however, they all have some similar specifications. … Continue reading Wireless LAN bridges and STLs<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[62],"class_list":["post-2155","post","type-post","status-publish","format-standard","hentry","category-tech-stuff","tag-stl"],"_links":{"self":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/2155","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/comments?post=2155"}],"version-history":[{"count":6,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/2155\/revisions"}],"predecessor-version":[{"id":11813,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/2155\/revisions\/11813"}],"wp:attachment":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media?parent=2155"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/categories?post=2155"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/tags?post=2155"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}