When read this object indicates the Port Ring Speed obtained by the RSA function. Write to this object when defining the Port Ring Speed for a fixed configuration (TsPortCfgRSA set to fixed(2)). When TsPortCfgRSA indicates fixed(2), this object is equivalent to the dtrMac MIB object cPortProtocolCharMediumRateOption and to dot5RingSpeed. Note that the syntax of these objects is different. For cPortProtocolCharMediumRateOption 1 indicates 4 Mb/s, while for TsPortCfgRingSpeed 1 indicates 16Mb/s. This object is a valid read object any time that TSPortLinkState indicates up(1)or when TsPortCfgRSA indicates fixed(2).