<communications, standard> An ITU-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 in ITU-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)
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