ELCRODAT 6-2 provides secure transmission of classified information up to TOP SECRET. It can be used for all ISDN basic services, even via satellite links (Inmarsat M4), e.g. for: Voice / Data / Fax (group 4) /Video conferences The ELCRODAT6-2 system is available in two versions: ELCRODAT6-2S for secure Euro-ISDN basic rate access (S0 bus/port) ELCRODAT6-2M for secure Euro-ISDN primary rate access (S2M port) The ELCRODAT 6-2M permits simultaneous single-channel encryption of up to 30 channels. A typical application of this version is the 2 Mbit/s port encryption at the frontend of ISDN PBX systems. The ELCRODAT 6-2 is the first encryption unit approved by the German Information Security Agency for the transmission of information classified up to TOP SECRET which uses a public key method for key distribution. In conjunction with the public key method, the noise generator implemented in the encryption unit permits mutual authentication and key agreement. New session keys are generated in the encryption unit for each connection. They do not leave the units and are deleted after the session, thus ensuring maximum security. 
The ELCRODAT 6-2M allows commercially available primary rate access ISDN terminal devices and PABXs that feature an S2M interface and which support the D channel protocol DSS1 to transfer encrypted or clear information within ISDN. The ELCRODAT 6-2M crypto device supports simultaneous, independent operation of 30 B channels with 64 kbit/s each in duplex mode. The ELCRODAT 6-2M is used as an S2M port crypto device or an S2M dedicated connection crypto device. The ELCRODAT 6-2M is not a terminal device, but is capable of establishing or accepting a call itself within the scope of key management and monitoring tasks. The ELCRODAT 6-2M is for use in the office environment.