UNITED STATES DEPARTMENT OF AGRICULTURE

Rural Electrification Administration

TO: All Telephone Borrowers

REA Telephone Staff

EFFECTIVE DATE: Date of Approval

EXPIRATION DATE: Three years from effective date

OFFICE OF PRIMARY INTEREST: Transmission Branch, Telecommunications Staff Division

PREVIOUS INSTRUCTIONS: This bulletin replaces the following Telecommunications Engineering and Construction Manual Sections:

TE&CM 970, Fundamentals of Lightwave Transmission

TE&CM 971, Lightwave Terminology

TE&CM 974, Lightwave Terminal Equipment

TE&CM 976, Lightwave System Application Guidelines

FILING INSTRUCTIONS: Discard the following Telecommunications Engineering and Construction Manual Sections:

TE&CM 970, Fundamentals of Lightwave Transmission

TE&CM 971, Lightwave Terminology

TE&CM 974, Lightwave Terminal Equipment

TE&CM 976, Lightwave System Application Guidelines

Replace with this bulletin.

PURPOSE: To provide information on various aspects of lightwave technology. This bulletin includes a basic description of the fundamentals of lightwave transmission, a description of various lightwave terminal equipment, and guidelines for the design of a lightwave system. All information in this bulletin is advisory.

_________George Pratt_____________ ________ 05/17/91_____

Acting Administrator Date