  Master-slave systems have been intensively investigated to model the
application of chaos to communications. We considered Colpitts oscillators
coupled according to a master-slave configuration to study chaos
synchronisation. We revealed the existence of super persistent transients in
this coupled system. Moreover, we showed that an additive noise added to the
slave system may suppress chaos synchronisation. When synchronisation is not
suppressed, the noise induces longer transients.
