Classmark Testing

Snehasish Kar snehasish.cse at
Wed Dec 6 15:00:41 UTC 2017

Hello everyone

I have a doubt here from the DSP side, might be a silly one. While transmitting the classmark or any message from mobile on SDCCH during a call, does it transmit on the frequency we get after converting the ARFCN or is there a slight variation ?



From: baseband-devel <baseband-devel-bounces at> on behalf of Vadim Yanitskiy <axilirator at>
Sent: Wednesday, December 6, 2017 8:19:55 PM
To: f12.sebastian at
Cc: baseband-devel
Subject: Re: Classmark Testing

Hi Sebastian,

> My query is :  my test network is supporting A5/1,2,3. Is it feasible to
> set A5/1 on MS1 (though it supports A5/2 and A5/3 also) and A5/2 for MS2
> (though it supports A5/1 and A5/3 also) for a call in between them using
> "Early Classmark Sending" ???

I think it will work without any problems because the A5/X encryption
is not 'end-to-end' (in our case MS-to-MS), but there are two separate
encrypted sessions between MS1-BTS and MS2-BTS.

With best regards,
Vadim Yanitskiy.

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