1. EIA-449 Standard By- Vineeta Shakya
CORPORATE INSTITUTE OF SCIENCE & TECHNOLOGY, BHOPAL Department of Electronics and Communication Engg.
EIA-449 Standard
By- Vineeta Shakya

2. EIA 449 Standard
Introduced in 1970 by EIA to overcome limitation of RS-232
Increase Bandwidth
Increase Distance

3. Mechanical Specification
It has two connector
9 Pin connector
37 Pin Connector

4. 9 Pin Connector

5. Function of each Pin

6. 37 Pin Connector

7. Pin function

8. Category I Pins
Category - I Pins has those pins whose functions are compatible with those of EIA-232.
For each Category - I Pin EIA -449 defines two pins one in the first column and one in second colemn

9. Category-II Pins
Category – II Pins are those that have no equivalent in EIA – 232 or have been redefined.

10. Functions Of Category- II Pins

12. Electrical Specifications
EIA-449 uses two standard to defines its electrical specifications
RS- 423 (for Unbalanced Circuit)
RS- 422 (for Balanced Circuit)

13. RS-423 Standard

15. RS-423 Standard

17. Wave forms for RS-422

18. BNC Connector

19. BNC Connector

20. RJ-11 connector

21. Pin function

22. RJ-45 Connector