[BC] IP STL

[Robert Meuser]

Mike it is being done all the time. The communication for the digital to 
the TX is often unidirectional UDP, sometimes even multicast. TCP/IP has 
been very recently added as a possibility. Your analog plant feeds the 
processor at the studio which if it has built in diversity delay can go 
straight out your existing  analog STL as composite and into the TX. The 
digital stream can get there by any number of means, including 900 MHZ 
spread specrtum diplexed into the existing STL antenna. 2.4 or 5.8 gig 
links as well as bonded ISDN lines and fractional T1 are just some of 
the options for the digital.  This is not theory, this is how it is 
being done by some serious players and in some pretty large markets.

R


Mike McCarthy wrote:

>Not that easy Robert.  If you have an analog plant to support in 
>addition to the digital, "doing it all at the studio" is not that 
>feasible.
>
>MM
>
>  
>
>>No, you do it all at the studio.
>>
>>R
>>
>>Mike McCarthy wrote:
>>    
>>
>>>True to some extent Robert.  But you also need streams for the PAD 
>>>      
>>>
>and 
>  
>
>>>other data sent with them.  It takes up a much bigger bi-
>>>      
>>>
>directional 
>  
>
>>>pipe than 300 Kbps before it gets to the TX site.
>>>
>>>MM
>>>
>>>At 11:37 AM 2/19/2006 -0500, Robert Meuser wrote
>>>
>>>      
>>>
>>>>HD 2 is here. You need a 300 kbps link to the TX. Encoding is 
>>>>        
>>>>
>done at 
>  
>
>>>>the studio.
>>>>
>>>>R
>>>>
>>>>Mike McCarthy wrote:
>>>>
>>>>        
>>>>
>>>>>With HD2 et al coming,  One T-1 will not be enough unless we can 
>>>>>pre-code the whole thing at the studio and ship it out as one 
>>>>>pre-packaged data stream.
>>>>>I'm looking to find a loophole in Part 90 and Part 101 which 
>>>>>          
>>>>>
>will 
>  
>
>>>>>allow licensable multi-T-1 microwave links to operate as the 
>>>>>          
>>>>>
>final 
>  
>
>>>>>hop....which there are specific rules prohibiting such for 
>>>>>          
>>>>>
>program 
>  
>
>>>>>audio. We have 18 Ghz in Part 74...  But for more than a few 
>>>>>          
>>>>>
>miles, 
>  
>
>>>>>weather fade plays a GREAT role in it's reliability.  Snow, 
>>>>>          
>>>>>
>rain, and 
>  
>
>>>>>fog will kill a longer link.
>>>>>Stay tuned...
>>>>>As for the reliability, T-1's will vary by both the distance of 
>>>>>          
>>>>>
>the 
>  
>
>>>>>circuit AND the distance on each end to the CO.  Once we fixed 
>>>>>          
>>>>>
>the 
>  
>
>>>>>cable at the studio (where we had weekly faults of some sort 
>>>>>          
>>>>>
>across 
>  
>
>>>>>all of our T-1's), all but a couple fault events have been at 
>>>>>          
>>>>>
>the 
>  
>
>>>>>transmitter end.
>>>>>Of course, all have some distance to the serving CO.
>>>>>I agree with Robert that you need diversity and a non-Bell means 
>>>>>          
>>>>>
>to 
>  
>
>>>>>convey program audio to the TX for the reasons he cites, plus 
>>>>>back-hoe fade, mice, tractors hitting pedestals, accidents, etc. 
>>>>>          
>>>>>
>On 
>  
>
>>>>>our more important sites, non-landline means are increasingly 
>>>>>          
>>>>>
>important.
>  
>
>>>>>MM
>>>>>At 09:33 PM 2/18/2006 -0500, Robert Meuser wrote
>>>>>          
>>>>>
>>>
>>>_______________________________________________
>>>This is the BROADCAST mailing list
>>>To send to the list, email: broadcast at radiolists.net
>>>For sub changes, archives and info on this other lists: 
>>>http://www.radiolists.net/
>>>
>>>      
>>>
>>_______________________________________________
>>This is the BROADCAST mailing list
>>To send to the list, email: broadcast at radiolists.net
>>For sub changes, archives and info on this other lists: 
>>    
>>
>http://www.radiolists.net/
>  
>
>
>Reply to <towers at mre.com>
>>From my traveling acount...
>
>
>_______________________________________________
>This is the BROADCAST mailing list
>To send to the list, email: broadcast at radiolists.net
>For sub changes, archives and info on this other lists: http://www.radiolists.net/
>
>  
>