Table of Contents
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This section includes detailed information that does
not readily :fit into the principles of operation or special
techniques sections. The items included are:
• Glossary of Terms
• Data Set Operating Procedure
• 1052/1053 Printer Maintenance
• Specifications for 1050 Recording Media
• 1050 Planning Chart and Operator Instruction Sheet
• 1050 Timing Considerations
• 1050 Character Set Information
• Summary of Two-Character Function Codes (Prefix
and Alphabetic Character)
Glossary
of Terms
ADDRESSING: The sending by a master station (or trans-
mission control unit) of a code which specifies the
remote terminal and associated output component
which will receive the succeeding message.
ANSWER: The negative or positive answer to an LRC
compare.
ASSIGNED: A component of the 1050 system is assigned
when its assignment switch (on the 1052 switch panel
or the switch unit) is positioned to the proper home-
loop or line-loop setting.
CENTRALIZED HALF DUPLEX: A network of half-duplex
terminals operating on full duplex communication
lines. All terminals are centrally controlled with all
transmissions passing through the controlling or cen-
tral unit.
DATA SET: The term used when referring to the modu-
lator-demodulator unit or equipment.
DEMODULATION: The conversion, at the data set, from
audio signals off the communication lines to digital
signals for the IBM 1050 System.
DEsERIALIZE: The conversion at the 1051 (in the re-
ceive terminal) from a serial-by-bit, serial-by-char-
acter form, to a parallel-by-bit, serial-by-character
form.
HALF DuPLEX: A two-wire communications channel
capable of either transmitting or receiving, but in
only one direction at a time.
HoME Loop: An operation involving only those input
and output units associated with the local terminal.
This operation uses the home data channel in the
1050 system.
Appendix
LINE LooP: An operation over a communication line
between input units at one terminal and output units
at a remote terminal. This operation uses the line
data channel in the 1050 systems involved.
LRC TIME: The time required to send an EOB, and
LRC, and receive the answer.
MoDULATION: The conversion, at the data set, from
IBM 1050 System digital signals to audio signals for
transmission over communication lines.
MONITOR PRINTER: Any active printer at the sending
terminal which records the data transmitted from
that terminal.
NETWORK: A number of interconnected terminals.
OFF LINE: Not associated with a processor or trans-
mission control unit.
ON LINE: Associated with a processor either directly
or through a transmission control unit. The physical
connection can be accomplished by either multiwire
cable or a communication line.
POLLING: The sending by a master station (or trans-
mission control unit) of a code which requests a par-
ticular remote terminal and associated input com-
ponent to transmit any message ready to be sent.
RECOGNIZED: A component of the 1050 system is recog-
nized when its specific component recognition code
is detected on the proper data channel (home or
line). This provides the component for the sending or
receiving of a message. Generation of this code is
accomplished by either keying or reading the code
in the proper loop operation. This code is effective
when the system(s) involved contain the proper
component-recognition features (line or home).
REMOTE TERMINAL: Any terminal in a communications
network other than the terminal at which you are
physically located.
RESPONSE: The negative, positive, or no response at all
to a component select character (addressing or
polling).
SERIALIZE: The conversion, at the 1051 (in the transmit
terminal) from a parallel-by-bit, serial-by-character
form, to a serial-by-bit, serial-by-character form.
TIME-OUT: The time interval allotted for functional
operations to occur.
TURN-AROUND TIME: The time required to reverse the
direction of transmission when using a half-duplex
communication channel.
73
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