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Maximum Number of 3270 Graphic Personal Computers
You can designate up to four terminal addresses to a single work station.
This requires one primary and four logical addresses for one physical port
in the 3274 control unit. When planning to install the work station, you
should consider the number of logical and physical addresses that are to be
used, compared to the maximum number of addresses and ports that are
available. The number of addresses and ports available depends upon the
model of 3274 and the method of system attachment.
Note:
If 3279 Color Display Stations are attached to the same 3274 as is the
3270 PC, the 3270 PC must be put on a port ahead of the 3279.
When a 3274 has 3270 PCs attached that are operating in distributed
function mode, the maximum number of logical and physical terminals that
can be attached to that 3274 is as shown Figure 40.
3274
Model
lA
lC
lC
10
31A
31C
31C
310
41A
41C
41C
410
SlC
SlC
61C
61C
Legend:
System Attachment
Maximum Number of 3270
PC Logical Terminals
Channel, SNA
128
TP SDLC
128
TP BSC
32
Channel, non-SNA
32
Channel, SNA
128
TP SDLC
128
TP BSC
32
Channel, non-SNA
32
Channel, SNA
128
TP SDLC
128
TP BSC
32
Channel, non-SNA
32
TP SDLC
36
TP BSC
32
TP SDLC
76
TP BSC
32
SNA
- Systems Network Architecture
SDLC - Synchronous Data Link Control
BSC
- Binary Synchronous Communication
Note:
Non-SNA terminals require one port address per logical
terminal.
Figure 40.
Maximum Number of Terminals Attached to the 3274
Appendix A. Attachment to an IBM 3274 Control Unit
91
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