The entertainment version of the game pretty much datalinks aircraft to ground radars anyways (detection) although we could add this as link. Very interesting stuff!
Thanks! Yes, I've noticed that they connect that way, but I forgot to mention, you see, in the upper right corner of the picture - the connection to A-50 AWACS planes (up to three). So it allows for proper situational awareness, even despite using SAM C2 station as an intermediate.
Also, forgot to mention, the Su-27 datalink doesn't have a name (unlike previous Lazur' "datalink"), in documents it's just referred as TLK (TeLeKodirovannaya Svyaz' - Telecoded Connection). In case you need ingame number of channels, the Su-27SK's K-DlAE uses 20 channels for this datalink (screenshot from avionics documentation included below).
Also, the manufacturer of said datalink equipment indicates that this system is installed on MiG-29SMTs, Su-30s, probably on Su-34, however for latter it might be the S-108, currently installed on Su-35 and, supposedly, on PAK FA prototypes, the T-50s.
And a small note, regarding the database names: "T" index is for Sukhoi's prototypes (T-10 became Su-27, for example), so T-50 is the name of the prototype, the resulting plane in serial production will be called PAK FA (perspective front aviation complex) or given a proper Su index (probably 41, since others before are occupied).