| http://www.w3.org/ns/prov#value | - Table 1 below is a table of selected optical communication standards, the coding schemes used, their raw bit rates, and exemplary primary frequency sources that may be used to generate REF_FREQ. TABLE 1 Optical Coding Primary Communication Scheme frequency Standard Used Variant Raw Bit Rate source SONET/SDH NRZ OC-3/STS- 155.52 Mb/s 19.44 MHz. 3/STM-1 (??? ??? bit rate) SONET/SDH NRZ OC-12/STS- 62
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