In another thread, someone asked about network searches, and a response mentioned info found in the NIT stream.
I thought it might be helpful to show some info about NIT streams using some screen captures obtained from the program TSREADER running with my
Twinhan PCI card.
Anyway, as mentioned in other thread, most satellite transponders over the US don't have useful NIT information. However the Globecase transponders are an exception. So I just went to G25, and tuned in the 12145V transponder, which I *thought* was a
Globecast transponder. This transponder didn't even have an NIT stream.
I then went to 12084V. THis transponder DID have an NIT stream. The TSREADER screen capture shows:
You notice the NIT stream listed at the bottom of the left hand breakdown of streams. I then opened up the NIT list, and clicked on the 12084 transponder, screenshot shown below:
Notice that on opening up the NIT info, it lists ALL of the Globecast transponders, listing the orbital location, their frequencies and polarities. Also notice that it DOES list the 12146 transponder (my receiver had 12145 which was wrong, but close enough), however the 12146 transponder didn't have any NIT info.
On clicking on the 12084 transponder, it gave the NIT info over to the right.
Notice in that info, that it tells you that the 12053 transponder has the correct NIT info. So I went to the 12153V transponder:
I then opened up the NIT area, and clicked on the 12153 transponder:
Notice over at the right, it says "Current Network: True" . I *THINK* that's how the receiver is supposed to determine if this network information is about the transponder currently tuned to. I copy/pasted the 12053 network information below:
Network Name:
Network ID: 1 (0x0001)
Transport Stream ID: 7 (0x0007)
Original Network ID: 1 (0x0001) Version: 24
DVB-S Orbital Position: 97.0W
Frequency: 12.053 GHz
Modulation: QPSK, DVB-S
Polarity: Vertical
Symbol Rate: 22000 MSps
FEC: 3/4
Current Network: True
Descriptor: Service List Descriptor
Service: 83 () user defined (0xd0)
Service: 240 (Adult Alt.) digital radio sound service
Service: 241 (Today's/Ctry) digital radio sound service
Service: 242 (Classic/Ctry) digital radio sound service
Service: 243 (Bluegrass) digital radio sound service
Service: 247 (Hip Hop / R&B) digital radio sound service
Service: 248 (Classic R&B) digital radio sound service
Service: 249 (R&B Soul) digital radio sound service
Service: 253 (Arena Rock) digital radio sound service
Service: 254 (Classic rock) digital radio sound service
Service: 255 (Retro-Active) digital radio sound service
Service: 259 (Dance) digital radio sound service
Service: 260 (Lite Hits) digital radio sound service
Service: 261 (Adult Top 40) digital radio sound service
Service: 262 (Hit List) digital radio sound service
Service: 263 (Party/Favs) digital radio sound service
Service: 264 ('80s) digital radio sound service
Service: 265 ('70s) digital radio sound service
Service: 266 (Oldies) digital radio sound service
Service: 269 (Singer/Stand) digital radio sound service
Service: 270 (Big Band) digital radio sound service
Service: 271 (Easy/Listen) digital radio sound service
Service: 274 (Cont/Instrum) digital radio sound service
Service: 275 (Smooth Jazz) digital radio sound service
Service: 276 (Jazz) digital radio sound service
Service: 277 (Blues) digital radio sound service
Service: 278 (Reggae) digital radio sound service
Service: 279 (Soundscapes) digital radio sound service
Service: 280 (Class/Master) digital radio sound service
Service: 281 (Light/Class) digital radio sound service
Service: 282 (Rock) digital radio sound service
Service: 283 (Christian) digital radio sound service
Service: 284 (Seasons) digital radio sound service
Service: 285 (Int'l/Love) digital radio sound service
Service: 286 (Taste/Italy) digital radio sound service
Service: 290 (Reggaeton) digital radio sound service
Service: 291 (Salsa/Mereng) digital radio sound service
Service: 292 (Rock/Espanol) digital radio sound service
Service: 293 (Pop Latino) digital radio sound service
Service: 294 (Mexicana) digital radio sound service
Service: 295 (Tejano) digital radio sound service
Service: 500 (Al Forat) digital television service
Service: 501 (Al Forat Radio) digital radio sound service
Service: 504 (RSC3 PROTV INT) digital television service
Service: 505 (Bridges TV) digital television service
Service: 506 (Pink Extra) digital television service
Service: 507 (Press TV) digital television service
Service: 508 (RSC 1 Romania) digital television service
Service: 509 (RSC 2 Romania) digital television service
Service: 510 (NTV Hayat) digital television service
Service: 513 (RFI Francaise) digital radio sound service
Service: 514 (RFI /MC M O) digital radio sound service
Notice it gives all sorts of info about the mux, including orbital position, freq, polarity, SR, modulation type, etc, etc, plus it lists all the channels carried, and gives names, etc. I clicked on the network info from other transponders, and it didn't give the names. You'd have to go to that transponder to get the channel names I guess.
Anyway, you can see how a receiver, if told to do a network scan on 12053, would see the list of all the Globecast transponders, and it would then scan each of those transponders, and find all the channels on the Globecast network.
I then went to G10r, and went to 11720 and 11800V transponders. Both of those transponders have an NIT stream, however the NIT streams have incorrect info. An example of the incorrect info from 11720V:
Network Name: Site - 1
Network ID: 1 (0x0001)
Transport Stream ID: 2 (0x0002)
Original Network ID: 1 (0x0001) Version: 12
Descriptor: Network Name Descriptor
DVB-S Orbital Position: 0.0W
Frequency: 0.000 GHz
Modulation: QPSK, DVB-S
Polarity: Horizontal
Symbol Rate: 29120 MSps
FEC: 7/8
Current Network: True
Descriptor: Service List Descriptor
Service: 1 (KLRA) digital television service
Service: 2 (WNYI) digital television service
Service: 3 (KMCC) digital television service
Service: 4 (KKTU) digital television service
Service: 5 (KPBI - AR) digital television service
Service: 6 (WBLU) digital television service
Service: 7 (KXUN) digital television service
Service: 8 (KWCE-RTN) digital television service
Service: 9 (KEYU) digital television service
Service: 10 (KAMT) digital television service
Service: 11 (WNGS) digital television service
Service: 12 (KWWF) digital television service
Service: 13 (KFDF) digital television service
Service: 14 (KUTH-KU) digital television service
Service: 15 (KEGS) digital television service
Service: 16 (KLMN-GFMT) digital television service
Notice that it lists the orbital position as 0.0 , it lists the transponder freq as 0.0, and it has the wrong SR value, the wrong polarity. It does have a list of channels though, which I think is correct, although I have seen times that it was incorrect on these transponders. There were 3 transponders listed in the network area. All have incorrect info, and all listed the same channels. So doing a network search from this transponder wouldn't have found anything new, and would only have wasted time.
Anyway, I find it fun to use TSREADER and look at these NIT areas. Often it does give you correct info about the actual freq/SR values the uplinkers are actually using, since our blind scan receivers often come up with incorrect values. However 90% of the time the information in the NIT is incorrect.
Linear Mode
