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communications, standard (Formerly "RS-422") An EIA
serial line standard which specifies 4-wire,
communications. The mechanical connections for this interface
are specified by EIA-449. The maximum cable length is
1200m. Maximum data rates are 10Mbps at 1.2m or 100Kbps at
1200m. EIA-422 cannot implement a truly multi-point
communications network (such as with EIA-485), although only
one driver can be connected to up to ten receivers. The best
use of EIA-422 is probably in EIA-232 extension cords.