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it is a combination of 2 connectors, one with 37 pins and other with 9 pins, to form combination of 46 pins.

EIA-449 defines 2 categories of pins for exchanging data, control and timing information.

category 1 include those pins whose function are compatible with those of EIA-392. some of the functions are receive data, send data, RTS, send timing terminal ready, receive ready.

category 2 include those pins whose equivalent is not present in EIA- 232. some are terminal service, receive common and so on

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Q: What is EIA-449 in data communication?
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