Value,Description,Reference,Registration Date
0,No L2-Specific Sublayer,[RFC3931],
1,Default L2-Specific Sublayer present,[RFC3931],
2,ATM-Specific Sublayer present,[RFC4454],
3,MPT-Specific Sublayer,"[""Data-Over-Cable
        Service Interface Specifications: Downstream External PHY Interface
        Specification CM-SP-DEPI-I01-050805"", DOCSIS, August 2005]",2006-01-30
4,PSP-Specific Sublayer,"[""Data-Over-Cable
        Service Interface Specifications: Downstream External PHY Interface
        Specification CM-SP-DEPI-I01-050805"", DOCSIS, August 2005]",2006-01-30