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Author Topic: Upgraded my Internet and lost the whole works James Westbrook Phenomenal Film Handler Posts: 1133 From: Lubbock, Texas, Usa Registered: Mar 2006 posted 11-10-2014 02:25 AM                     An AM radio station in Lubbock has it's signal delivered from the studio downtown to the transmitter southeast of town via ISDN. I keep wondering if there is a better way for them to deliver the signal, thinking ISDN is supposed to be a back up to the other methods of signal transmission... The station owner divulged this after said signal was affected with a buzzing noise. "The phone company said it would be fiber optic all the way there! HA HA HA!"  |  IP: Logged Rick Raskin Phenomenal Film Handler Posts: 1100 From: Manassas Virginia Registered: Jan 2003 posted 11-10-2014 05:37 AM                     Actually ISDN on is good for voice transmission and can even work for video if inverse multiplexing schemes are employed. The physical connection could be very well be fiber end to end as ISDN, like any other communications protocol, can run over fiber. Back in the day we used to say that ISDN was "too little too late" and ATM was "too much too soon".  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 11-10-2014 09:36 AM                     One of the first commercial uses of MP3 compression was to deliver "high quality" audio over ISDN lines. You could now do live transmissions that didn't sound like telephone using ordinary phone lines. The underlying PSTN infrastructure has always been rock solid. The great thing with all those TDM based protocols, no matter if it's ISDN, ATM or SDH is that you exactly know what you get, end-to-end. Those packet networks are great for "computer data" transmission, especially if the data isn't sensitive to latency or rather more importantly: jitter. But for live audio and video, nothing still really beats it. The only reason why people are switching to packet/IP based solutions is because they ended up being cheaper. Ethernet has become a commodity protocol, found everywhere, it's cheap and abundant. The modern solution is to simply throw a huge amount of extra bandwidth at it or compress the hell out of it if it doesn't fit...  |  IP: Logged Rick Raskin Phenomenal Film Handler Posts: 1100 From: Manassas Virginia Registered: Jan 2003 posted 11-10-2014 04:01 PM                     I completely agree. Try VOIP on a congested network and see what you get.  |  IP: Logged Jeff Kane Film Handler Posts: 74 From: corpus christi, tx Registered: Jun 2011 posted 11-12-2014 09:06 PM                     A ve ry cho pp y exp e r nc if n e th ing all.  |  IP: Logged David Buckley Jedi Master Film Handler Posts: 525 From: Oxford, N. Canterbury, New Zealand Registered: Aug 2004 posted 11-12-2014 09:30 PM                        quote: James Westbrook I keep wondering if there is a better way for them to deliver the signal... Have they got line-of-sight from studio to transmitter? Either a conventional STL or AoIP using wireless networking are popular choices if so. If not, then it has to be wired. Perhaps a question for the broadcast forum?  |  IP: Logged James Westbrook Phenomenal Film Handler Posts: 1133 From: Lubbock, Texas, Usa Registered: Mar 2006 posted 11-15-2014 12:34 PM                     There may be some compromise with line of sight between the station's studio and transmitter. The studio is located in downtown Lubbock in a single story building that was retail 60 or so years ago. I need to look more closely, but from the front of the building I am not seeing a satellite dish on the roof nor nearby, which makes me wonder how they receive their talk shows or the Sunday car racing program they air. But definitely, there is no terresterial dish on the roof directed toward the transmitter like I see at other radio stations. There are rather tall buildings between the studio and transmitter, but these are storage facilities for cotton at the processing plant. The same facility a misguided you-tube user claims is a FEMA Prison Camp.  |  IP: Logged Rick Raskin Phenomenal Film Handler Posts: 1100 From: Manassas Virginia Registered: Jan 2003 posted 11-15-2014 01:49 PM                     quote: James Westbrook said signal was affected with a buzzing noise Its been some 20+ years since I last dealt with ISDN but the above statement intrigues me. ISDN is a dial-up service. Is that the case here or are we talking about a dedicated circuit? Any buzzing is likely being introduced before the voice data is digitized. I would suspect a bad NT1 at either end or something interfering at the U interface. If the connection is a dedicated circuit why deal with ISDN at all when a simple 56K modem at each end would suffice. In my experience I found grounding, or lack thereof, to be a big issue. I once shot a trouble where the customer had plugged the equipment 3-wire power cord into a 2-wire extension cord. Lightning had fun with that one.  |  IP: Logged James Westbrook Phenomenal Film Handler Posts: 1133 From: Lubbock, Texas, Usa Registered: Mar 2006 posted 11-16-2014 02:03 AM                     It's a dedicated circuit, from what the owner said. The buzzing occurred after an electrical storm knocked out the power to the city. This occurred before dawn Saturday morning, but their issue was resolved that Monday. It may have been on their end. Or somewhere down the line. The owner sounded resolute that the problem was on AT&T's end before the buzzing was resolved. It's an oldies station and for AM they have a quality sound. I would listen to them a lot more but they carry a talk show which I am not fond of, and will speak of no further to abide by the policies of the forum. They may not be the only ones using ISDN locally for this purpose. The stations owned by Townsquare use the line of site devices. Another one has their transmitter in the same building as the studio. This leaves at least two others...one should have good line of site having their studios in the tallest office building in town. I am not sure where the transmitter to the last station is. (Radio Locator website, here I come...)  |  IP: Logged

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