wfFddiXLineCfgSmtIndex 1.3.6.1.4.1.18.3.4.15.5.1.1.12

Used for indexing into rfc1512 MIBS, this value is gotten from multiplying the 'slot*1000' and then adding the 'wfFddiXLineCfgNode' attribute described above. Its purpose is to uniquely identify each SMT which exists.