IBM 3274 51C Maintenance Information page 185

842 1
0000
D
II
D
IO'---_____
\ - - - - - I
Ref
D
fJ
D
II
D
~~--------------------------~L~in-e--~
Speed
:~~~
Description
On/Off switch:
m
=
On;
l2J
=
Off.
On indicator: Indicates the 3274 is on.
Canada
onlv
IML (Initial Machine Load) pushbutton: Pressing and
holding causes a basic test to run. When the pushbutton
is released, IML tests start. At completion, the machine
is loaded.
Alt IML Address switch:
• 1: Holding, while pressing the IML pushbutton,
bypasses the tests and loads the machine directly.
Use only after normal 1M L fails.
• 2: Holding, while pressing the IML pushbutton,
. invokes adapter and wrap tests.
II
8 4 2 1 indicators: These light while the 1M L push-
button is held. During IML, they follow the test
sequence. At completion, they all go out. During opera-
tion, the indicate opE'rational status.
Ref
o
Figure 0-5.
3274 Operator Panel - Model SIC with 120o-bps Integrated Modem
with
(I)
Switched Line with Manual Auto Answer Feature or (2)
Nonswitched Line with SNBU and Manual Auto Answer Feature
Description
Primary/Secondary Speed Switch - In the Primary posi-
tion the modem operates at normal speed; in the
Secondary position the modem operates at half speed.
Transmit Level Attenuation Switches (Switched Network
only) - These four switches provide 0 to -15 dB
attenuation of the transmit level in 1 dB increments.
See the chart in paragraph 0.3.3 for the adjustment.
procedure.
Encrypt/Decrypt Key Switch - Allows a new master
key to be entered when in the horizontal position.
Encrypt/Decrypt Battery - Allows the master key to
be maintained in the 3274 when power is off .
Appendix D. Operator and Control Panels 0-7