Bell System 20A Operation Manual

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BELL SYSTEM PRACTICES
Toll System Operation
Description and Operating Principles
SECTION 314-016-160
Issue 1, July, 1963
AT&TCo Standard
20A WADS TOLL TESTBOARD
CONTENTS
1. GENERAL
2. EQUIPMENT ARRANGEMENT .
A.- General
B. Floor Plan Arrangement .
C. Test Bay Arrangement
D. Line Test and Patch Bay Arrangement
(Fig. 2)
E. Patching Cords and Plugs
3 •. TESTING FACILITIE·s .
4. DESCRIPTION OF CIRCUITS
A. Communication Cord Circuit
(SD-64613-01 ).
B.. Position and Telephone Circuit
· (SD-64616-01)
C. Dial Cord Circuit (SD-64761-01)
D. MF Keyset Circuit (SD-55925-01)
E. Signaling Test Circuit (SD-56497-01)
F. System Failure Alarm Circuit
(SD-56527-01)
G. Night and Supervisory Alarm Circuit
(SD-55039-01)
H. Telephone Circuit (SD-68330-01)
I. Jack,
Lamp,
and Key Circuits
(SD-56526-01, SD-95900-01)
J. Position Connector Circuit
(SD-56538-01)
K. Test Trunk Circuit (SD-27648-01)
L. Sleeve Repeater Circuit (SD-56536-01)
· M.
Incoming Test Line Circuit
(SD-56530-01)
N. lnco~ing Test Trunk Circuit
(SD-25850-01)
0. Data
Test Cord Circuit (SD-56528-01)
P. Transmission Measuring Circuit
Q. Noise Measuring System .
R. Frequency Measuri~ Equipment
S. Test Signal Generators
T. 906A Data Distortion Test Equipment .
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ILLUSTRATIONS
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Figure
Test Bay - Typical Arrangement 24
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Line Test and Patch Bay - Typical
Arrangement for Voice- and Nar-
row-Band WADS Trunks
20A WADS Toll Testboard -Two
Position Line-up •
Test Bay- Lower Unit
Keyshelf and Plugshelf
Arrangement
Lower Unit Relay Equipment
Identification
Test Bay-Jack Field Arrangement
Test Bay Jacks, Lamps, and Keys -
Identification
Line Test and Patch Bay Jacks -
Identification
Making Trunk Appear Busy In Both
Directions
Typical WADS Voice-Band Trunk
and Trunk Test .Jacks -
Block Diagram
12 . Typical WADS Narrow-Band Trunk·
and Trunk Test Jacks -
Block Diagram
13 Line E and M Lamp and Jack Circuit
14 Call Progress Tone Jacks .
15 Ground On Sleeve Jack
16 6E. Impulse Counter Key, Lamp, and
Jack Circuit
17 Extension Jacks
18 Trunk Jack and Answering Lamp
(Test Bay)
19 Dial Jack (Test
Bay) .
20 Profile Plug Conversion Jacks
(Line Test and Patch
Bay)
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@
American Telephone and Telegraph Company,
.1963
Printed in U.S.A.
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