This object indicates the code for serial encoding algorithm.
Options:
1. unspecified(1) - Unspecified
2. encodingMethod8B10B(2) - 8B10B
3. encodingMethod4B5B(3) - 4B5B
4. nrz(4) - NRZ
5. manchester(5) - Manchester
6. sonetScrambled(6) - SONET Scrambled
7. encodingMethod64B66B(7) - 64B66B
8. invalid(-1) - Indicates that the query fails or no information is detected