3274 Model 51C Operator Panel With The.2400-, 4800-, Or 9600-Bps - IBM 3274 User Manual

Ref
U
fJ
II
Description
On/Off switch:
III
=
On;
.lQ]
=
Off.
On indicator: Indicates the 3274 is powered on.
IML (Initial Machine Load) pushbutton: Pressing and holding causes a basic
assurance test to run. When the pushbutton is released, IML tests start. At
completion, the machine is loaded. With the Integrated Modem feature, the
integrated modem self·test requires a power-on reset to run.
D
Alt IML Address switch:
• Position 1: Holding, while momentarily pressing the IML pushbutton,
bypasses the IML tests and loads the machine directly. Use only after
normal 1M L fai Is .
• Position 2: Holding, while pressing the lML pushbutton, causes
remote interface tests to run.
Pressing and holding causes the integrated modem self-test to run and to
repeat approximately every 4 seconds, until the switch is released.
II
8 4 2 1 indicators: These light while the IML pushbutton is held. During
IML, they follow the test sequence. At completion, they all go out. During
operation, they indicate operational status.
II
Encrypt/Decrypt key switch: In the horizontal position, allows a new master
key code to be entered.
II
Encrypt/Decrypt battery: Maintains the master key code in the 3274 when
power is off.
m
Good/Poor data-quality indicators: Indicate the quality of received data as
follows:
Good
Poor 1
Meaning
On Off Good signal quality (no errors).
Flashing Off or flashing Marginal signal quality (about three bit errors
per second).
Off On or flashing Poor signal quality (about six bit errors per
second).
Off
Off No signal being received.
On On Temporary condition (1 second or less) - ignore.
lWhen the integrated modem self-test is run by use of the ALT 2 switch, the
Poor indicator should Ught jf the self-test is failing. The indicator turns off
when the switch is released.
II
Test: This indicator is on when the integrated modem is in test mode. Test
mode is entered when the self-test is running, when a test function is being
run from the central site modem, or when the link problem determination aid
(LPDA) host-invoked diagnostics are running.
lID
Operate: This indicator shows that the integrated modem is ready to exchange
data with the attached TP network.
m
Modem Address switches (S): These eight switches provide the address for
host-invoked LPDA diagnostic tests. The address switches should correspond
to the 3274 address that was customized.
Figure 1-15 (Part 2 of 2).
3274 Model 51C Operator Panel with the
2400-, 4800-, or 9600-bps Integrated Modem
Feature; and with the Encrypt/Decrypt Feature
Section
1.
Operator Information
1-33