TTL encoding in Connect Em

We are using Connect Em Module for one of our projects.The TTL output of this module is interfaced with fiber optic transmitter and receiver.For the purpose our design ,we would like to get information regarding the coding implemented for the TTL.Whether it is NRZ coding or Some other coding .If it is NRZ ,please mention the type of NRZ coding implemented for bits “1” and “0”.

Thanks and Regards

I would look in the NS7520 Hardware Reference Guide (version: 90000353_G). There is talk of the coding options: NRZ, NRZB, NRZI, FM and Manchester. Pages #209, 231 and 245 explain these options.

Link to the NS7520 Hardware Reference Guide: