Bell System 914 Series Description And Operation

Data test sets

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BELL SYSTEM PRACTICES
AT&TCo Standard
SECTION 107-101-100
Issue 3, January 1973
1.
2.
3.
4.
5.
6.
7.
914-TYPE DATA TEST SETS
DESCRIPTION AND OPERATION
CONTENTS
GENERAL
PHYSICAL DESCRIPTION
FUNCTIONAL DESCRIPTION
B.
C.
D.
E.
F.
Power Supply
OUTPUT
SPECIFICATIONS
AND
IN~UT
REQUIREMENTS
OPERATION
AND
TYPICAL
TEST
ARRANGEMENTS
A.
Matrix
B.
Selector Switch
c.
Meter
D.
Interval Counter
E.
Serial Data Sets
F.
G. Analog Data Sets
MAINTENANCE
REFERENCES
PAGE
4
5
6
9
9
10
10
11
11
11
11
11
12
12
13
14
14
15
27
1.
GENERAL
1.01
This section provides a physical and functional
description and operating theory necessary
for effective use of the 914-type data test sets
(DTSs).
1.02
This section is reissued to provide information
on the 914C DTS and to show the 914B DTS
as manufacture discontinued (MD). Because many
914B DTSs are still used in the field, information
on this unit is retained. Since this reissue constitutes
a general revision, arrows ordinarily used to indicate
changes have been omitted.
1.03
The 914C and 914B DTSs will be referred
to in this section as ''the DTS" unless special
applications
make it necessary
to refer to the
specific nomenclature.
1.04
The DTS is a portable unit which facilitates
dynamic and static tests of voiceband data
sets. It is used for testing digital and analog data
systems.
It provides all the functions of the 901,
902, 903, and 913 series of data test sets and
introduces several additional features not previously
available. A high degree of flexibility is incorporated
in the DTS which allows for accomodation of testing
requirements of future data systems.
Features of
the DTS include the following:
• Flexibility in establishing all required interface
connections
• Three types of test messages; dot signal,
63-bit, and 511-bit words are available
• Automatic and manual word synchronization
• Variable width window for sampling received
data
• Bit and block error counting
© American Telephone and Telegrah Company, 1973
Printed in U.S.A.
Page
1

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