D/Line Radio Blog

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Modern Protocol Problems with an Old Firewall

Legacy systems are part of any mature technical environment. While I was a combination of both impressed and shocked when recently presented with a SunOS 5.7 box (OS dated 1998!) I had to assist...

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Reading Cart Chunk with PowerShell

Look at the audio files in any professional radio playout system. They’ll likely be linear WAVE files with the associated metadata stored in the cart chunk format. With this information it’s usually enough to...

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First Steps into OpenDaylight with Brocade

It’s not often that catch-up meetings with vendors lead to anything particularly exciting but a recent one I attended with Brocade was a little different. While Brocade have had Openflow support for a very...

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Logging Failure Reasons in FreeRADIUS

FreeRADIUS is an incredibly powerful RADIUS server and a tool I’m currently taking through a proof of concept as a possible replacement for Microsoft NPS. While the debug output of FreeRADIUS is fantastic in...

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Moving a Point-to-Point Microwave Link

At one station I volunteer for, we use a 1.5GHz microwave link to connect between the studio and the transmitter site on top of a hill nearby. Now I should stress that microwave link...

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Flipping Over to Your Competitor?!?

Weirdly, I had a problem I’ve not seen for years crop up recently. And it all started with complaints about car radios flipping between us and a competitor radio station. That’s not a good...

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LLDP, Voice and Port Security on Comware 7

Getting a practical deployment of 802.1x on the wired network running Comware 7 is something that’s been on my radar for a while now. Until recently, we had a working (for our system) configuration...

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Plotting for Improvement

It’s something a lot of community radio stations here in the UK are trying to improve – their FM coverage footprint. While the 25 watts ERP that Ofcom often licence stations at is usually...