IBM 3741 Data Station Reference Manual page 65

Model 2 or 4
System/3
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3741 Model 2 or 4
Figure 27 (Part 2 of 2). 3741 Model 2 or 4 Communications
Configurations
Networks
The 3741 can use a switched or nonswitched network for
point-to-point communications or nonswitched network for
mUltipoint communications. See Figures 28 and 29.
Point-to-Point Nonswitched Network
3741
Modem
Model 2 or 4
Point-to-Point Switched Network
3741
Modem
Model 2 or 4
Figure 28. Point-to-Point Telecommunications Networks
Nonswitched Common Carrier, Voice Grade
A nonswitched, point-to-point or multipoint network con-
sists of dedicated, private, or leased communication lines.
Nonswitched point-to-point networks connect the 3741
Model 2 or 4 with remote terminals or processing units.
Nonswitched multipoint networks connect the 3741
Model 2 or 4 with a processing unit. On a nonswitched
network, the terminals are physically connected: that is,
the cjrcuits making up the communication lines are
continuously established for predetermined time periods
during which data may be transmitted over the lines.
Since the terminals are continuously connected, no dialing
is required.
Modem
Modem
Modem
Modem
3741 Model 2
or 4, 3747, or
Processing Unit
3741 Model 2
or 4, 3747, or
Processing Unit
3741 Model 2
or 4, 3747, or
Processing Unit
3741 Model 2
or 4, 3747, or
Processing Unit
Communications 59