Telos Alliance Blog Central

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The Bisset Brief: Considering a Wireless Bridge STL

By John Bisset on Apr 25, 2018 11:45:00 AM

Telos’ invention of AoIP almost 15 years ago has brought with it some amazing changes to broadcast engineering. In addition to simplified installation and the end of punching down long wiring runs, AoIP has brought a new look at the STL, or Studio-Transmitter Link.

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Topics: STLs, xNodes

Axia User Offers a Free Utility to Aid Simple Livewire Routing

By Kirk Harnack on Jul 26, 2017 11:45:00 AM

Anthony Eden is a broadcast engineer and systems integrator in Australia. And, he's a big fan of Audio over IP technology, particularly Livewire+.

PathfinderPC and Pathfinder Core PRO provide powerful and flexible scheduling, routing, monitoring, and alerting for Livewire+ AoIP networks. However, Anthony Eden needed a bit less horsepower for a particular application. His client simply needed to select which studio would feed the station's air chain. So, Anthony wrote a Windows application in Python to do just that - and only that.

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Topics: IP Audio Network Routing & Control, Livewire, STLs

No Problem in Houston: Replacing STLs with xNodes

By Robbie Green on Feb 1, 2017 1:00:00 PM

In late 2015, I was examining the expiring contracts for many of our legacy telco services. As I did, it quickly became apparent that we could do much better, both in terms of cost savings and quality.

CBS Radio Houston has a somewhat unique situation, in that all four of our FMs are co-located at two transmitter sites. The main site for the FMs is the Senior Road Tower, and our aux is an American Tower site nearby. In the past, both sites were linked to the studios via digital 950 MHz STLs and multiple T1s, with the 950 MHz links serving as mains and the T1 links serving as backup.  As you might expect, data for things like telemetry and HD Radio rode on timeslots in our T1 frames that weren’t being used for audio transport.

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Topics: Axia Audio, STLs, xNodes

xNodes Link Community Radio for Northern Colorado

By Shane Toven on Nov 30, 2016 11:45:00 AM

With its beginnings on the University of Northern Colorado campus in 1967 as KCBL, 91.5 KUNC serves residents of Northern Colorado with a unique blend of locally-produced news, music, and other popular public radio programming. Now owned and operated by Community Radio for Northern Colorado, the group has grown to a network of over 14 stations and translators throughout Colorado.

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Topics: Axia Audio, STLs, xNodes

IP-Radios - The New Studio-Transmitter Link (STL)

By Kirk Harnack on May 4, 2016 11:56:18 AM


Radio broadcasters have traditionally used 950MHz analog or digital point-to-point radio systems to transport their audio programming from the studio to the transmitter site. Leased T1 or E1 digital land-based circuits have also been popular where a line-of-sight radio path cannot be established. Each system has strengths and shortcomings;  the radio STL is one-way only and has little room for ancillary data. The landline T1/E1 solution implies a monthly lease expense, as well as high capital costs for the endpoint equipment, and still not much extra data bandwidth once the program audio is transported. With multi-station shared transmitter sites, HD Radio, off-site automation backup, security cameras, remote control, and Internet access all becoming necessities, a reliable, high-bandwidth data transport scheme becomes  critical. Enter the modern 2-way IP-radio system. These carrier-grade links can transport several stereo audio channels with bit-for-bit clarity, plus provide for all the other data services just mentioned and have room for growth. This paper describes not only the STL needs and challenges facing broadcast engineers, but provides clear, workable solutions both in the abstract and specific solution cases.

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Topics: IP Radios, STLs, IP Radio STLs


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