Teletype SA120 Installation Manual

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BELL SYSTEM PRACTICES
AT&TCo Standard
SECTION 578-200-201
Issue 1, September 1971
2.
3.
4.
PARITY FAILURE DETECTOR AND
SUBSTITUTE CHARACTER INSERTER (SA120)
INSTALLATION
CONTENTS
GENERAL
PHYSICAL CHARACTERISTICS
SIGNAL REQUIREMENTS
POWER REQUIREMENTS
SA120 INSTALLATION PROCEDURES
GENERAL
A.
B.
Preparation of All SA120 Units
Preparation of TP322400 Break
Generator/Counter Driver ...
C. Signal Line Connections . . . .
D. Power and Ground Connections
SA120 INSTALLATION WITHOUT BYPASS
SWITCH OR INDICATOR ASSEMBLY ....
SA120 INSTALLATION IN RECEIVER WITH
BYPASS SWITCH OR INDICATOR
ASSEMBLY ........ .
ASSEMBLIES, TERMINALS,
AND FUNCTIONS
A. TP327631 Bypass Switch or TP327632
Bypass Switch, Indicator Lamp, and
Counter Assembly in Model 33 Set
B. TP327633 Bypass Switch or TP327634
Bypass Switch, Indicator Lamp, and
Counter Assembly in Model 35 Set
C. TP327637 Bypass Switch With Lamp
and High Speed Counter; TP327638
Bypass Switch With Lamp and Low
Speed Counter; TP327639 Bypass
Switch With Lamp Only; and TP327640
Bypass Switch Only, All in Type 2
Receiver ............... .
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5
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5.
CONTENTS
SA120 INSTALLATION IN SENDER
WITH BYPASS SWITCH ASSEMBLY
(SA120 FA ONLY) ......... .
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21
1. GENERAL
1.01 This section provides the installation information
and procedures for the SA120 parity failure
detector and substitute character inserter (Figure 1). It also
provides similar information for the associated variable
feature - the bypass switch and indicator assembly ( when
used with the related wiring diagrams and the wiring diagrams
for the terminal equipment to be used). The circuit element
locations referenced in the text may be located on schematic
wiring diagrams according to the following system:
8716WD - 2 F 3
CN-,ic,I
,omdmat< on sheet
Alphabetical coordinate on
sheet
'--------Wiring diagram sheet number
.__ _________ Schematic wiring diagram
number
1.02 When reference to wiring diagrams is necessary,
those shipped with the equipment are the most
current and should be used if available. Otherwise, use the
figutes and wiring diagrams referenced in this section,
Schematic wiring diagram 8200WD and actual' wiring
diagrams 8201WD (bipolar) and 8202WD (current/no
current) cover the basic SA120.
1.03 There are two versions of the SA120: One for
installation on receivers to detect parity errors and
insert substitute characters for them in the output copy, and
one for installation on senders using nonparity tapes to insert
correct parity_ in the outgoing signal. There are two varieties
Prepared for American Telephone and Telegraph Company by Teletype Corporation
©
1970 by Teletype Corporation
All rights reserved
Printed in U.S.A.
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