Well to apply for the BSNL TTA exam you can follow the below process

Visit the official site of the BSNL external

A page like below will open



hit on the link for the apply online in front of the junior engineer link at the center
.

Enter the details here to register

Deadlines For the TTA Exam

NOTIFICATION 14.07.2016

COMMENCEMENT OF ONLINE REGISTRATION AND SUBMISSION
OF ONLINE APPLICATION 14.07.2016 (12.00 A.M.)

LAST DATE FOR ACCEPTANCE OF ONLINE PAYMENT OF EXAMINATION
FEES 10.08.2016 (11.59 P.M.)

DATE OF CLOSURE OF ONLINE REGISTRATION AND SUBMISSION OF
ONLINE APPLICATION 10.08.2016 (11.59 P.M.)

DATE OF WRITTEN EXAMINATION 25.09.2016 (Sunday)