I had to correct problems for a radio station we service. What a PITA dealing with them is. I accept the guy knows more about AM/FM radio than ill ever even think about, but come on, learn the tech youre managing. Fist issue was they were broadcasting real time stream with absolutely no buffer. They also were not running any firewall. so after a few times of them getting hacked and being an open SIP server, they decided to get a more secure device (still no firewall) and finally got one with a buffer and correction. I think I got him to buffer up 3 seconds, which pretty much resolved all that.
Its like come on, be realistic, dont run things with no margins. This would literally have askip when someone walked into the tower shed and turned on the fluorescent light On Thu, Jun 25, 2020 at 2:16 PM Adam Moffett <dmmoff...@gmail.com> wrote: > So some radio station is transporting audio over IP from studio to > tower. A few weeks ago they started getting skips in the audio, and > they're finger pointing at me. At first I couldn't even see a problem. > Eventually I find that every so often there's a 1/10th second event with > packet loss. Seven seconds after the event you hear a little blip on > the radio. You could go a few hours between events, or only a few minutes. > > I said yeah I'll try to track down what's causing that, but if you have > a 7 second delay on this one-way transmission, isn't there plenty of > time to resend 1/10th second of missing audio? > > *grumble grumble*, finger point, it worked before, etc > > So I've been trying to narrow down where this is happening and swap > interfaces and such. And keep in mind anything I do interrupts the > radio so I have to do it at odd hours. Periodically during the process I > re-ask why does this even happen? This amount of loss shouldn't hurt you. > > *grumble grumble*, finger point, it worked before, etc > > So today they let me take a look at their Comrex audio streaming > thing-a-ma-bobbers, and I looked in the manual. Turns out the error > correction features don't work on lossless audio codecs unless your > firmware version is above a certain revision. Theirs isn't above that > revision, and they're using a lossless audio codec. So now I'm like, > yeah I'll keep looking for that little blip, but in the meantime you > don't have to hear it if you'll upgrade your firmware and enable FEC. > > They've had a number of people looking at this, including their > engineer. Their equipment has robust enough error correction that they > could run that stuff on satellite or 4G if they wanted to. It's just not > configured right! > > You'd have fixed this in half an hour if you'd have RTFM'd you frickin > noobs. > > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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