communications, standard (Formerly "RS-422") An EIA

serial line standard which specifies 4-wire,

full-duplex, differential line, multi-drop

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.