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Note: The receive queue size selection must satisfy this formula:
where:
Pm
The number of ports set for a medium (519-byte) receive queue
PI
The number of ports set for a large (1079-byte) receive queue
P
4
The number of ports operating as Device_Class_ 4
(see "Device Class" on page 13-27)
Pis
The number of ports supporting Models 3, 4, or 5 emulation.
(see "3270 Model Emulation")
P
ne
The number of ASCII ports not excluded.
Warning: If you do not satisfy the formula before invoking the user-defined
configuration, you receive the message Cll7 BUFFER CONSTRAINT EXCEEDED; Pm +
2(P I ) + 2(P
4 )
+ 2(P
ls )
<
49 - 2(P
ne )
followed by the values from the inequality. At
the next restart, the 3708 temporarily invokes the IBM-supplied configuration.
When logging on to the control terminal the next time, you receive message
C116
BUFFER CONSTRAINT EXCEEDED. To cause the 3708 to invoke the user-defined
configuration, configure the ports to satisfy the formula.
3270 Model Emulation
[2 - 5]
Type the largest screen size (Model 2, 3, 4, or 5) supported by this port. If
Operating Mode
=
Protocol Enveloping Only, Device Class
=
Printer, or Device
Class
=
Keyboard/Printer, this option must be 2.
Value
2
3
4
5
Display Model
Model 2
Model 3
Model 4
Model 5
Receive Queue Pacing Threshold
[0 - 2]
Screen Size
24
x
80
32
x
80
43 x 80
27 x 132
This option is used to determine whether or not the 3708 transmits XOFFs and
XONs to a downstream device based on the number of unprocessed characters in the
3708 receive queue. If receive queue pacing is enabled, the XOFF pacing threshold
may be set at either 50% or 75% of the configured size of the 3708's receive queue
(RECEIVE QUEUE SIZE).
0- The 3708 does not pace based on its receive queue.
I-The 3708 transmits an XOFF when its receive queue is 50% full. An XON is
transmitted when the receive queue is 25% full.
2-The 3708 transmits an XOFF when its receive queue is 75% full. An XON is
transmitted when the receive queue is 25% full.
Chapter 13. Configuration Procedures
13-31
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