Bell System 403E Series Description And Operation

BELL SYSTEM PRACTICES
AT&TCo Standard
SECTION 594-026-100
Issue 3, February 1974
DAT A SET 403E-TYPE
SINGLE RECEIVER STATION
DESCRIPTION AND OPERATION
CONTENTS PAGE
1. GENERAL
1
2.
PHYSICAL DESCRIPTION 2
3.
FUNCTIONAL DESCRIPTION 3
4. OPERATION
. .
.
.
3
OPERATION ON SWITCHED NETWORK 5
OPERATION ON PRIVATE LINE
8
5.
REFERENCES
.
. .
9
1. GENERAL
1.01
Data set (DS) 403E-type is a low-speed
parallel data receiver designed to receive
tw<.rout-of-eight signals generated by a TOUCH-TONE@
telephone and transmitted over the DDD network
or private 2-wire switched network facilities. DS
403E-type is for single-set installations, and uses a
DS 403D-type receiver. These data sets supersede
DS 403A-type, which is rated Manufacture Discontinued
(MD). This section contains a physical and functional
description of DS 403E-type and covers the operation
of the data set in its various modes. A list of
references is given to provide additional information
on the data set and peripheral components.
1.02
This section is reissued to revise Table C
. to show level instead of attenuation for
options S, T, and V; to add levels for these options
for data sets rated MD; and to add a footnote
concerning external padding. Because many of
the DS 403E2, 3, and 4 (MD) are still used in the
field, information on these units is retained.
1.03
The current standard data sets provide for
operation with ESS and on Unigauge loops,
and meet the signal level constraints of FCC Tariff
No. 263. An attendant alert feature (except on
DS 403E7) and a third-wire out-of-service feature
are also provided on the current standard sets.
1.04
DS 403E-type consists of DS 403D-type and
an 8A-type data unit housed in a KS-20018-Ll
cabinet. A data auxiliary set (DAS) 804G-type is
required to provide data, talk, and test mode
controls for the data station and to provide
conventional telephone service (Fig. 1). A DAS
801A or 801C automatic calling unit (ACU) may
also be provided as a component of the station on
an optional basis. If a ground-start ACU is used
[DAS 801A5, 801A6, 801C3, or an 801C4 with
ground-start (option V)J, then only an 8A5 data
unit and a DAS 804G3 or 804G4 series 2 and above
must be used to provide a DIAL TONE key. See
Section 598-048-100 for information concerning
DAS 804G-type with DIAL TONE key.
1.05
DS 403E-type is intended for those installations
that require one, two, or possibly three DS
403D-type. If more than three data sets are
required at a receiving station, a data station
employing DS 403D-type should be considered as
explained in the section entitled Data Set 403D-Type.
Multiple Data Set Station- Description and Operation
(594-025-101).
1.06
The data set is designed to operate on the
switched telephone network and various
private line networks to receive numeric data
generated by any one of a class of transmitting
terminals using a 2-out-of-8 code (TOUCH-TONE
signals), and to provide the means for interfacing
with any compatible business machine.
1.07
Facilities are also provided within the DS
403E-type for automatic call answering and
for generation and transmission of an answer tone
and answer-back tones. DS 403E5 and 403E6 also
accept customer-originated voice signals, regulate
their amplitudes, and transmit them over the
telephone line. Provision is made for the data set
to be tested remotely by a data test center.
© American Telephone and Telegraph Company, 1974
Printed in U.S.A.
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