Tetra streaming

sittinduck7

Anyone got any details on the site thats supposed to be streaming Garda comms on a website?
Supposed to be some kind of a spotter site for followers blue lights and the rescue services.

sittinduck7

sittinduck7 wrote: »

Anyone got any details on the site thats supposed to be streaming Garda comms on a website?
Supposed to be some kind of a spotter site for followers blue lights and the rescue services.

Link?

sittinduck7

Sorry pal dont have a link or the name of the site , a buddy just told me that it was goin on.

flyingsnail

Plenty of US ones but I never heard about any Irish ones.

sittinduck7

ok so ill try to find out more and will put up the details when i find out.

bravestar

sittinduck7 wrote: »

Anyone got any details on the site thats supposed to be streaming Garda comms on a website?
Supposed to be some kind of a spotter site for followers blue lights and the rescue services.

There are plenty of those sites... But none stream Garda comms. What you heard was BS.

Turner

I doubt it.

The whole reason we went digital was so the crims couldn't listen in on us, and for better coverage obviously.

sittinduck7

ya but that idea goes out the window when a website is broadcasting your comms.

msg11

Tetra cannot be accessed by anyone on the outside, simple as.

The network requires codes, them codes are monitored by the server , the server is automatic and to finish it off the tetra network is basically a secure private mobile network, it operates and functions in every single way a mobile network functions.

So no the network will never be online to the public. Unless someone with the correct codes inside the network broadcasts it out on another medium.

sittinduck7

sittinduck7 wrote: »

ya but that idea goes out the window when a website is broadcasting your comms.

A mythical website that you haven't actually seen yourself.

stretch00

Sittingduck,

I hope you are not a troll, but in the interest of reassurance, NDRS as the Irish system based on TETRA MOU, is as secure if not more so than any other comparable system.
Each handset has a TEI, similar to a mobile phones IMEI - if your terminals TEI does not exist in the national database your terminal cannot join the system, won't even see the network. This is step one and the first fail point.

Each terminal, gateway, router etc is assigned an ISSI which must make sense to the rest of the network, step two second fail point. Network Alias, and terminal alias must also match, and to top that off the correct encryption key must be present.
It must also be considered that each mast knows the location of neighbouring masts, and handsover the terminal only to specified adjacent masts, so there isn't even broadcasting in the traditional sense for you to stream or scan. As the traffic being switched between masts and terminals is encrypted at all points, there is nothing available there to stream either.

So all in all eh no. What you may be refering to is the tendency of some groups usually in UK to use VOIP to create digital radio networks in a method similar manner to conventional networks but without the safety and security aspect(apologies to the techies, this is a simplistic use of term ) and for some small few oddballs to then stream generally american non encrypted police, fire, ems streams over this network so that it appears that their walter mitty radios bought on auction sites function as bonifide, generally airwave UK (TM) radios to impress their rather odd friends.

kub

Turner wrote: »

I doubt it.

The whole reason we went digital was so the crims couldn't listen in on us, and for better coverage obviously.

One of the few resources you guys have that works as intended. All I can say is happy days long ago with my air band scanner, up all hours better than TV.

Please ignore this question if I am stepping on toes, but, I know the system is capable of connecting to other EMS radio systems, has this ever been acheived? (eg at major incidents etc)

stretch00

Hi Kub, yes it can, and yes it has been tested, there are dedicated talkgroups ( like channels) for this exact purpose.

goldie fish

It has also been used.

kub

stretch00 wrote: »

Hi Kub, yes it can, and yes it has been tested, there are dedicated talkgroups ( like channels) for this exact purpose.

Thanks Stretch, good to know 21st century technology is in use.

pah

Our there is a compromised handset or idiot member out there. That's entirely possible isn't it?

goldie fish

pah wrote: »

Our there is a compromised handset or idiot member out there. That's entirely possible isn't it?

If there was, its content would be very limited.

searescue

stretch00 wrote: »

Sittingduck,

I hope you are not a troll, but in the interest of reassurance, NDRS as the Irish system based on TETRA MOU, is as secure if not more so than any other comparable system.
Each handset has a TEI, similar to a mobile phones IMEI - if your terminals TEI does not exist in the national database your terminal cannot join the system, won't even see the network. This is step one and the first fail point.

Each terminal, gateway, router etc is assigned an ISSI which must make sense to the rest of the network, step two second fail point. Network Alias, and terminal alias must also match, and to top that off the correct encryption key must be present.
It must also be considered that each mast knows the location of neighbouring masts, and handsover the terminal only to specified adjacent masts, so there isn't even broadcasting in the traditional sense for you to stream or scan. As the traffic being switched between masts and terminals is encrypted at all points, there is nothing available there to stream either.

So all in all eh no. What you may be refering to is the tendency of some groups usually in UK to use VOIP to create digital radio networks in a method similar manner to conventional networks but without the safety and security aspect(apologies to the techies, this is a simplistic use of term ) and for some small few oddballs to then stream generally american non encrypted police, fire, ems streams over this network so that it appears that their walter mitty radios bought on auction sites function as bonifide, generally airwave UK (TM) radios to impress their rather odd friends.

You're 100% correct. I do a lot of work with TETRA and it's as simple as this - if it aint on the network you gotta make a phone call.

TETRA radios are available freely on eBay but there's little point in doing so - TETRA terminals have very little output power so range is very limited and you can only ever talk to another TETRA terminal that's setup same as your own.

Because of the limited range, enthusiasts have taken to this ROIP (Radio Over Internet Protocol) - the radio version of Skype.

Video here that I grabbed on the tube - HTH:

gctest50

msg11 wrote: »

Tetra cannot be accessed by anyone on the outside, simple as.

I think you might be missing the OP's point - basically sniffing it instead of joining in.


bound to be someone who knows what they're at poking away at it sheerly just for the fun of it





xcept: from tetra_demod import cqpsk # accepts an input file in complex format # applies frequency translation, resampling (interpolation/decimation) class my_top_block(gr.top_block): def __init__(self): gr.top_block.__init__(self) parser = OptionParser(option_class=eng_option) parser.add_option("-c", "--calibration", type="eng_float", default=0, help="freq offset") parser.add_option("-i", "--input-file", type="string", default="in.dat", help="specify the input file") parser.add_option("-l", "--log", action="store_true", default=False, help="dump debug .dat files") parser.add_option("-L", "--low-pass", type="eng_float", default=25e3, help="low pass cut-off", metavar="Hz") parser.add_option("-o", "--output-file", type="string", default="out.dat", help="specify the output file") parser.add_option("-s", "--sample-rate", type="int", default=100000000/512, help="input sample rate") parser.add_option("-v", "--verbose", action="store_true", default=False, help="dump demodulation data") (options, args) = parser.parse_args() sample_rate = options.sample_rate symbol_rate = 18000 sps = 2 # output rate will be 36,000 ntaps = 11 * sps new_sample_rate = symbol_rate * sps channel_taps = gr.firdes.low_pass(1.0, sample_rate, options.low_pass, options.low_pass * 0.1, gr.firdes.WIN_HANN) FILTER = gr.freq_xlating_fir_filter_ccf(1, channel_taps, options.calibration, sample_rate) sys.stderr.write("sample rate: %d\n" %(sample_rate)) IN = gr.file_source(gr.sizeof_gr_complex, options.input_file) DEMOD = cqpsk.cqpsk_demod( samples_per_symbol = sps, excess_bw=0.35, costas_alpha=0.03, gain_mu=0.05, mu=0.05, omega_relative_limit=0.05, log=options.log, verbose=options.verbose) OUT = gr.file_sink(gr.sizeof_float, options.output_file) r = float(sample_rate) / float(new_sample_rate) INTERPOLATOR = gr.fractional_interpolator_cc(0, r) self.connect(IN, FILTER, INTERPOLATOR, DEMOD, OUT) if __name__ == "__main__": try: my_top_block().run() except KeyboardInterrupt: tb.stop()

msg11

gctest50 wrote: »

I think you might be missing the OP's point - basically sniffing it instead of joining in.


bound to be someone who knows what they're at poking away at it sheerly just for the fun of it

The only people that have access are the people who have ;

A registered handset that the network has in its database, if your familiar with computers think of it like this, the router/switch will only let handsets with the correct mac address from the database on the network. So you'll need to know 1. A handset mac address 2. The know how to flash one of the units and change the mac address. Then add into that encryption that the network is using you'll have to figure that out. Even on top of that there's a user id and password interface so you have to log on.

Someone working on the network IE o2 would have access for testing etc..

As I said previous , it's a private mobile phone network. If I was going to the effort of trying to get into a Tetra network , I would much rather swing my efforts into the direction of getting into one of the main mobile networks.

I'm not saying it is impossible nothing is ever 100% secure there's always a weakness in every network.

But messing around with a government network let alone a state security network is not a good idea, plus them handsets give out all sort of information, so to go to all that effort then start streaming it online!

gctest50

msg11 wrote: »

The only people that have access are the people who have ;

A registered handset that the network has in its database, if your familiar with computers think of it like this, the router/switch will only let handsets with the correct mac address from the database on the network. So you'll need to know 1. A handset mac address 2. The know how to flash one of the units and change the mac address. Then add into that encryption that the network is using you'll have to figure that out. Even on top of that there's a user id and password interface so you have to log on.

You're still on the track of impersonating an auth'd unit though

I was more on about passively sniffing the traffic

In your good example of a computer network to achieve what i was on about , you could :

setup a mirror on the suspect employees port of the switch or dig out an old hub and put that in line with the cable or a bit of arp fun or build an ethernet tap
- none of which will have "Sniffing Device v1.3b" showing up in network neighbourhood

All that sort of carry on would just get you the data, since tetra is encrypted tis grand thankfully

msg11

I give up trying to explain the Tetra concept to people, I will wait for the live stream that is going to become live on the internet in the next few hours.

Honestly it's not going to happen and if it dose there will be a patch for it within hours.

Myrddin

pah wrote: »

Our there is a compromised handset or idiot member out there. That's entirely possible isn't it?

They can remote kill any lost/missing handsets with the press of a button. Radio's are personal issue, so nobody is going to lose them. There are pool radios in each station for reserves/spares etc, but these too all have to be accounted for.

pah

EnterNow wrote: »

They can remote kill any lost/missing handsets with the press of a button. Radio's are personal issue, so nobody is going to lose them. There are pool radios in each station for reserves/spares etc, but these too all have to be accounted for.

We're both taking about mules here right? :P