EIA-449 Standard

CORPORATE INSTITUTE OF SCIENCE & TECHNOLOGY, BHOPAL

Department of Electronics and Communication Engg.

By- Vineeta Shakya

• Introduced in 1970 by EIA to overcome limitation of RS-232

• Increase Bandwidth

• Increase Distance

EIA 449 Standard

Mechanical Specification

It has two connector

• 9 Pin connector

• 37 Pin Connector

9 Pin Connector

Function of each Pin

37 Pin Connector

Pin function

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

Category-II Pins

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

Functions Of Category- II Pins

Electrical Specifications

EIA-449 uses two standard to defines its electrical specifications

• RS- 423 (for Unbalanced Circuit)

•RS- 422 (for Balanced Circuit)

RS-423 Standard

RS-423 Standard

Wave forms for RS-422

BNC Connector

BNC Connector

RJ-11 connector

Pin function

RJ-45 Connector