Teletype 33 Description And Operation

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BELL SYSTEM PRACTICES
AT&TCo Standard
SECTION 591-810-110
Issue 1, July 1971
33 AND 35 TELETYPEWRITER STATIONS
FOR "DATA LINE CONCENTRATOR" SERVICE
DESCRIPTION AND OPERATION
1.
2.
3.
CONTENTS
GENERAL ...
DESCRIPTION AND OPERATION
STATION CONFIGURATIONS
A.
B.
C.
D.
E.
F.
One Cluster of Stations,
One Local Computer
One Cluster of Stations,
· One Remote Computer
One Cluster, More Than One
Computer ......... .
Multiple Clusters, One Computer
Multiple Clusters, More Than
One Computer . . . . . . . . .
Eight or Fewer Stations
Remote From One Destination
REFERENCES . . . . . . . . . . .
1. GENERAL
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1.01 This section provides a general description and
operation of 33 and 35 teletypewriter stations for
Data Line Concentrator Service, hereafter referred to
as
DLCS.
1.02 The 33 and 35 stations used in this service are
keyboard send-receive (KSR) and automatic send-
receive (ASR) stations, friction or sprocket feed. Receive-
only stations are not used.
1.03 DLCS can provide for the connection of a maxi-
mum of 128 variously configured stations to a
smaller number of computer ports. Speed of transmission is
at 100
wpm
(110 baud). DLCS is an originate only service,
from the station to the computer. No transmission between
stations is possible except in DLCS/DATA-PHONE® inter-
connection arrangements where a DLCS station can access· a
DATA-PHONE
station.
1.04 The 33 ASR Station is shown in Figure 1. The
keyboard arrangement for the 33 station is shown
in Figure 2. The 35 ASR Station is shown in Figure 3. The
keyboard arrangement for the 35 station is shown in Figure
4. References to left, right, up, down, &ont, rear, etc
consider the teletypewriter station as viewed by the station
operator.
2.
DESCRIPTION AND OPERATION
2.01 33 and 35 stations for DLCS consist of ASR and
KSR teletypewriters, friction or sprocket feed,
equipped with one of a variety of data sets. The particular
data set used depends upon the way the teletypewriter
station is configured.
STATION CONFIGURATIONS
2.02 DLCS permits a station to access a computer port
in a number of ways, of which the following six
may be considered basic configurations:
A. One cluster of teletypewriter stations, one local
computer.
B.
One cluster of teletypewriter stations, one remote
computer.
C. One cluster of teletypewriter stations, more than
one computer.
D. Multiple clusters of teletypewriter stations, one
computer.
E. Multiple clusters of teletypewriter stations, more
than one computer.
F. Eight (or less) teletypewriter stations, one com-
puter (or one concentrator).
2.03 Each of these service arrangements requires specific
data sets at the teletypewriter location, at the
concentrator, and at the computer port. This practice covers
Prepared for American Telephone and Telegraph Company by Teletype Corporation
©
1971 by Teletype Corporation
All
rights reserved
Printed in U.S.A.
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