This object indicates the ONT actual rate type.
Options:
1. rate1G1G(1) - Downstream rate 1Gbps, upstream rate 1Gbps
2. rate10G1G(2) - Downstream rate 10Gbps, upstream rate 1Gbps
3. rate10G10G(3) - Downstream rate 10Gbps, upstream rate 10Gbps
4. invalid(-1) - Indicates that the query fails or no information is detected