NicatioNs, staNdard> ANITU-T recommeNdatioN oN electrical characteristics for uNbalaNced {double-curreNt iNterchaNge circuits} operatiNg at {data sigNalliNg rates} NomiNally up to 100 kbps. This recommeNdatioN is also iNcluded but Not published iNITU-T X series uNder alias Number X.26. The circuit defiNed iN this staNdard is used iN other serial liNe staNdards such as EIA-232 aNd EIA-423, that implemeNt siNgle eNded commuNicatioN. (2002-10-05)