This object represents the configured line type.
Sts is SONET format. Stm is SDH format.
sonetSts3c : OC3 concatenated
sonetStm1 : European standard OC3
sonetSts12c : OC12 concatenated
sonetStm4 : European standard OC12
sonetSts48c : OC48 concatenated
sonetStm16 : European standard OC48
sonetSts192c : OC-192 concatenated
sonetStm64 : European standard OC-192
sonetSts3 : OC3 (unconcatenated)