RFI-EMI-GUY
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Is there any way to force the G4 into ADP only? Perhaps the firmware is trying to decide between clear or coded and is forcing a stream of errors.
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ADP Encrpytion garbled traffic
- Thread starter estone4009
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kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
If the Unication isn't decoding/decrypting at -110, it's a Unication issue. -110dBm isn't a great signal and FEC should be putting it all back together, with little to no packet loss.
-80 to -100 is not terrible either. I get full AES Decryption on my XTS2500.
I'd open a support ticket with Unication.
Been working with Unication support for over two months now and keep coming up with nothing. My signal jumps to mid -90s and it fails a lot. Support actually said a -87 was low and we needed to improve signal. The system was designed for the radios and they all work without any issues so not not much changing on the signal strength. I continue to push support on issues and I think they have given up on figuring out ADP. Glad I am not the only one to see this.
kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
Their support is stupid. -87dBm is NOT a weak signal.
MTS2000des
5B2_BEE00 Czar
-95dbm or better is what the IFC510 spec says is a good enough signal for DAQ of 3.4 or better when testing DAS/BDAs. If Unication pagers need more than this for reliable decoding, than their receivers are deaf lemons.
RFI-EMI-GUY
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How are you measuring the signal strength? Are you inside a building or outside? I assume the signal measured coincides with the failures?
RFI-EMI-GUY
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Did you try this???
Inside building in a window facing tower. We see the signal strength go down when the audio is garbled and it is failing to decrypt correctly.
No sure how ro force it any more than it is. Paged only has a single ADP key loaded and only one talkgroup in play and it is ADP encrypted. That talkgroup is in a system and it has that key selected. Very few options as far as setup in the pager.
RFI-EMI-GUY
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1) Does that building have a Bi-directional amplifier system?
2) What floor are you on when testing at the window?
3) Are you reading signal strength from the pager directly or another instrument?
No in building amplifiers. Ground floor.
Directly from the pager diagnostics screen. This is the same method I have been doing for Unication support as they requiree to send videos showing the pager signal strength on the screen.
RFI-EMI-GUY
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If there is any option to force it to ignore clear communications it would be an interesting test as the clear/coded bits possibly do not have same level of error correction/recovery as the encryption itself.
RFI-EMI-GUY
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OK can you or have you tried a different side of the building to rule out a location problem which could be specific to the simulcast or some other interfere?
We have tested this using 2 pagers side by side. One pager running the encrypted talkgroup and the other running a clear talkgroup. These talkgroups are patched at the dispatch console and should provide identical audio. The clear talkgroup pager passes the audio without issue on same signal strength. It was presented to Unication with this exact scenario with a video to show the audio difference. I still believe this is a bug with ADP encryption but support seems to think I am one of very few running ADP encryption.
Yes. Spread our testing to multiple locations across county and see same results
RFI-EMI-GUY
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Sounds like you have eliminated a lot of possibilities. Sad that they, Unification, have not treated this with urgency. Sounds like they have a problem with either code detection or error correction. They should be able to duplicate this on a test bench. Is there a "proper code detect" option in the programming? Maybe turn it off.
RFI-EMI-GUY
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Can you advise if the encryption is Call Based or Channel Knob Based. The latter would be Secure "strapped" and the former would be Secure/Clear detected on the fly.
What version of PPS is this you are showing? I am using V0.4.0.41 and on some custom firmware from support in the v2.04 range and I am not seeing the same settings. To get any support they require me to be using latest PPS and new firmware.
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I would also love to see if anyone using AES has issues as we are trying to develop a plan to see if we can deploy AES just for pagers and leave the radios on ADP as they do not support AES. I am wondering if the pager uses a different method to decode AES versus ADP and that is why Unication is struggling with this. I do know the Unication engineers questioned why we are not using AES but that is a million dollar purchasing decision that was made long ago for the radios. Aggravated that according to sales ADP is acceptable but in practice it has not been safe and functional to use.
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