Macom DES Encryption

[jeepon02]

couple of questions. I have upgraded LPE and P7100 for DES encryption. These radios are using the exsisting network, which involves 7 EDACS sites with master III 800 base stations. in other words, the radios were doing straight analog, I updated the radios to DES encryption and have made no changes to the channels at the sites. amazing enough after some hair pulling with the key loader it worked.....47 radios talking local and multisite using keyed DES.

ok the problem, voice quality went away which i expected with the extra digital overhead. but its not the voice quality as much as the echo affect.....plus multisite calls have a large delay.....im wondering if low speed data, and voice mod in the radio need to be adjusted......plus i wonder if any changes need to made at the site.....or the switch

anyone else doing this

Thanks and have a happy new year

Ken

 

[studgeman]

Ken, Based on what you are doing, I would highly suggest you give M/A Comm a call directly. For the delay I would suspect an issue in the controllers or multi-site controller. This could be a combination of software and hardware depending on the generation of your equipment.

Concerning the voice quality...what generation of digital voice are you using? AEGIS or ProVoice? AEGIS is an older format which has a poorer voice quality and a more pronounced echo effect than ProVoice or P25. (ProVoice and P25 use the same Vocoder). Modern DIGITAL encryption has no degregation of voice quality or addtional significant delays.

 

[jeepon02]

yup have been in contact with Macom........they looking into it also.......we are using PV

 

[jeepon02]

plus to my understanding all this happens in the radio and nothing at the NOC or the Sites need to be adjusted.....

 

[nhiester]

I would start with the simple and make sure that all radios have the correct and most recent flash and dsp codes. I would also check to make sure that it is not a handful of radios by checking them in pairs. If this yeilds no definitive results, maybe try isolating the sites one at a time, then 2 at a time. Could it be a problem with one or more data paths between sites? maybe having a high retransmission rate? Just a few ideas for thought.

 

[jeepon02]

thanks,

DES will only work with 17B radio code (LPE) and R6P DSP (LPE) see the thing is all of these radios were doing analog for 3 years b/f, so all paths are known good. Im working with Mark @ Macom, very helpful....just wanted to get some out of town thoughts.....I was told from MACOM upgrade the features in the radio, update radios code, dsp, load the key loader and bammmm all should work just fine.....and it does work....like you said i have a hand full of radios that seem to work just fine and some that are real crapy.....so i just have to find them.....just looking for any extra input...

thanks guys im packing it in for the year.....

ken