This object indicates the encapsulation information about the optical transceiver.
Options:
1. unknown(1) - Unknown
2. sff2x5(2) - SFF 2x5
3. sff2x10(3) - SFF 2x10
4. sfp(4) - SFP
5. xfp(5) - XFP
6. lxfp(6) - LXFP
7. bosaonboard(7) - BOSA ON BOARD
8. invalid(-1) - Indicates that the query fails or no information is detected