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Principles of Operation
The
IBM
1050 Data Communications System provides
considerable flexibility and versatility for the handllng
of data-recording and data-transmission applications.
To utilize the system capabilities most effectively, it is
essential that a thorough understanding of the system
be acquired. This should include controls, setup pro-
cedures, operating principles, and special features for
both the over-all system and the individal components.
All of these areas are contained in this detailed infor-
mation section. In addition, special techniques for the
processing of advanced applications are described.
1050 System
~
General Operation
This system is capable of simultaneous home-loop and
line-loop operation. This unique type of operation is
possible because two independent data channels are
provided (one
fo~
home and one for line). Each com-
ponent required for a specific operation must be ·as-
signed to the proper data channel by positioning the
associated component assignment switch on the 1052
switch console. In addition, component-recognition
codes can be inserted in the text of a message to turn
components on or off automatically.
The data flow for the 1050 system is detailed in
Figure 14. This diagram shows how the system ac-
cepts input data from any one of three input units and
records output data at any one, or all four output units.
To move data into or out of the system, as wen as
within the system, the data channels must be used.
This means that all data handled by the system must
go through the 1051 control unit. Some of the signifi-
cant features contained in this unit are:
Ilome
Home Register
Horne Clock
Line
Use
Line Register
Character analyzing
Line Clock
Internal timing
Horne-Component Line·-Cornponent Component on and off
Recognition
Recognition
control
Serializer-
Character breakdown and
Deserializer
assembly to and from the
data set
LRC
VRC
Oscillator
Line Control
18
1050 Detailed Information
Longitudinal redundancy
checking
Vertical redundancy
checking
Speed control to and from
the data set
Communication line dis-
cipline for message control
1051 Control Unit
The features described in this section are all standard
features of the 1051 and are provided on the appro-
priate models. For example, Line Control is provided
with Models 1 and 2, while Home Bypass and Restore
is provided on Models 1 and NL The additional fea-
tures available for the 1051 are described under Special
Features.
Line Control (Models 1 and 2)
The
IBM
1050 System transmits and receives in a half-
duplex mode in the following line configurations:
1. Point-to-point-1050 to 1050, with the master switch
off at one terminal; 1050-to-1050 with line control
off at both terminals; or 1050 (with master switch
off) to a transmission control unit (and processor).
2. Multipoint-1050 master (master switch on), or a
transmission control unit (and processor) to as many
as 25 additional 1050 systems. One additional 1050
system can be added to the network when a trans-
mission control unit is used. Thus, the maximum
total for 1050 systems in any given network is 26.
In a multipoint network, terminals cannot communi-
cate directly with each other. Terminal-to-terminal
messages must be relayed through the master ter-
minal or transmission control .unit (and processor).
In multipoint operations, or point-to-point opera-
tions with a transmission control unit (without dial-
up line facilities), a control discipline is required on
the communication line. This discipline is called
line control, and
it
prevents two or more stations
from attempting to use the line simultaneously (line
contention). Line control is provided on Models 1
and 2 of the 1051. This line-control discipline pro-
vides two distinct modes for all 1050 operations,
control mode and text mode.
All codes transmitted during control mode pro-
vide either terminal control or component selection
for the remote terminal, and are neither printed nor
punched. Refer to Multipoint Operation in the Spe-
cial Techniques section for exceptions. The codes
transmitted during control mode are:
Control Signals: EOT, EOA, EOB, Yes, No, and In-
quiry.
Polling characters. These consist of an alphabetic
station-identification character (A-Z) followed by a
numeric component-select character (5, 6, 7, or 0).
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