DIGITAL SIGNALING JOB AID

This Job Aid has been developed to assist technicians in determining: Analog and digital signaling conditions present at different points of an AT&T circuit Optioning of Digital Central Office equipment for particular circuit applications and The application of the job aid indications when using the aid with a variety of Testing Vehicles.

TABLE OF CONTENTS
1 USER GUIDE ............................................ . 3
2 SIGNALING CHARTS
    FX LOOP START ....................................... 5-6
        TDMs .......................................... 7-10
    FX GROUND START ................................... 11-12
        TDMs ......................................... 13-16
    E&M ............................................... 17-18
    PLRs .............................................. 19-20
    DX .............................................. 21 - 22
    RINGDOWNS
        MANUAL ....................................... 23-24
        AUTOMATIC .................................... 25-28
3 TEST SET/LOGIC CONVERSION TABLES (INTRO} .................. 29
    DTAC PANEL ........................................... 30
    OATS TEST SET ......................... ............... 31
    SPTS TEST SET ........................................ 32
4 DIGITAL SIGNALING TABLES
    TABLE A -CLEI CODES .......................... ....... 33
    TABLE B -DACS TRUNK CONDITIONING CODES ............. 36
    TABLE C -FACILITY CONNECTOR OPTIONS ................. 38
    TABLE D -NCI CODES (from JA-9) ................... 40-44