Contributed by Sam Etler.

Contributed by Sam Etler.

Contributed by Sam Etler.

Contributed by Sam Etler.

Contributed by Sam Etler.

Contributed by Sam Etler.

Contributed by Sam Etler.

Contributed by Sam Etler.

Contributed by Sam Etler.

Contributed by Sam Etler.

2500DMGC with Message Waiting, Timed Recall, and Three-level Volume Control. Used with DIMENSION, SYSTEM 85, AND SYSTEM 75 PBXs. Late production with 72-type dial, PCB, and weighs 2 pounds 8 ounces. Much of its mass is in weights on the bottom plate and in the receiver cavity. Contributed by Russ Kirk.

Provided by Erik Schull

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