The Field Access Test Unit (FATU) is designed to assist the Field Technician in maintaining the Local Telephone Loop.
Data Sheet

FATU-C
Carrying Case for FATU
FATU-TC1
Test Cord for FATU, RJ-45 to 5 color-coded alligator clips
FATU-TC2
Test Cord for FATU, RJ-45 to 4 color-coded alligator clips