Bosch DCN Next Generation Operation Manual page 143

Conference System
Signal levels for telephone and intercom contacts:
–
–
–
Bosch Security Systems B.V.
no call: < 1 V(DC.
call: > 3 V(DC), max. 24 V(DC).
Galvanic separated.
Operation Manual
Connection | en 143
2013.11 | V2.0 | DCN-NG_OM_V4.x