Data Sets - IBM 1050 Reference Manual

Data Sets
The
IBM
1050 Data Communications System can op-
erate over transmission facilities using the following
commercially available data sets or their equivalent:
Western Electric Data Set 103A: For use in point-to-
point dial-up connections.
Western Electric Data Set 103F: For use in multi-
point or point-to-point leased line connections.
Western Union Data Sets: For use in multipoint or
point-to-point leased line connections.
IBM Line Adapter: For use in multipoint or point-to-
point privately owned line connections. The
IBM
Line Adapter and the Telegraph Line Attachment
are each special features installed within the
IBM
1051.
Western Electric Data Set 103F
After a text transmission time-out occurs, the line con-
nection is automatically de-activated. This causes an
invalid pulse to be transmitted to the controlling sta-
tion; in turn, the transmission control unit, or the mas-
ter station timer will reset and time-out. This condition
occurs once before controlling station reverts to polling
or addressing operations.
Western Union Data Sets
In a network using this type of data set, group ad-
dressing and broadcast addressing can be accom-
plished.
103A Dial-up Data Set Procedures
The dial-up data set is used to connect two
IBM
1050
terminals for point-to-point operation on either:
1. voice-grade common-carrier telephone channels at
200 bps, or
2. narrow-band common-carrier channel (TWX) at 150
bps. Each 1050 terminal is attached to the commu-
nication channel by means of a data set.
Voice-Grade (200 bps) Telephone Procedure
To establish a connection for the transmission of data:
1. Lift the handset at the sending terminal and press
the
TALK
button to establish a dial-tone.
2. Manually dial the receiving terminal number. The
ringing at the receiving terminal is heard on the line.
3. Lift the handset and press the
TALK
button at the
receiving terminal to establish voice communication.
Note: For proper operation the phone at the receiving
terminal should complete at least one ring before the handset
is lifted.
7 4 1050 Detailed Information
4. Switch to the data mode of operation by pressing
the
DATA
button at the receiving terminal first. This
causes a tone signal to be heard at the sending ter-
minal and the
DATA
button can now be pressed at
this terminal. The handsets at each terminal are now
replaced and the data mode connection between
terminals is maintained.
5. Press the reset key at each 1050 station to reset both
sending and receiving stations prior to starting
transmission of data.
6. To disconnect from the communication line at the
end of the message, first transmit an EOT code to
prevent a data check condition; then operate the
System, Dial Disc switch on each 1050 system.
Voice-Grade (200 bps) Telephone Procedure,
with Automatic Answering - Optional
The 103A data set provides, optionally, an automatic
answer feature which operates in conjunction with the
AUTO
button on the data set. When this button is active
(self-locking in the active position) the terminal is auto-
matically connected to the communication line j[n re-
sponse to any call from another terminal.
When automatic answer occurs at the receiving ter-
minal, a tone signal is immediately returned to the
sending terminal. Pressing the
DATA
button at the send-
ing terminal establishes a data mode of operation be-
tween terminals. This feature must be requested by
the user from the common-carrier prior to installation
of the data set.
Narrow-Band
(1
SO bps) Dial Procedure for
use
with TWX
The data set used with TWX has no voice transmission
capabilities. All stations have the automatic answer
feature. To establish a connection between two 1050
terminals on the TWX network:
1. Press the
DIAL
button to establish a dial-tone.
2. Manually dial the receiving terminal number. The
remote terminal ringing will be momentarily heard
through a speaker located in the handset.
3. When connection is established (the receiv'ing sta-
tion answers), a tone is automatically sent to the
sending terminal and the
DATA
button must be
pressed to place this terminal in the data mode.
4. The operator at each 1050 station presses the reset
key prior to starting transmission of data.
5. To disconnect from the communication line at the
end of the message, first transmit an EOT code to
prevent a data check condition; then operate the
System, Dial Disc switch on each 1050 system.