3274 Model 51C Operator Panel With The 1200-Bps Integrated Modem - IBM 3274 User Manual

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IJ
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Description
On/Off switch:
m
=
On;
lQJ
=
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.
Alt IML Address sW,itch:
• Position 1: Holding, while momentarily pressing the IML push-
button, bypasses the IML tests and loads the machine directly.
Use only after normal IML fails.
• Position 2: Holding, while pressing the IML pushbutton, causes
remote interface tests to run-.
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.
Talk/Data switch
• Talk position - The operator may use the handset for voice communication.
• Data position - The handset is bypassed; only machine data is allowed on
the communication line (switched network only).
Call in Progress indicator: I ndicates that a connection has been established
(switched network only).
Line Speed switch: In'the'Pri position, the modem operates at normal speed;
in the Sec position, the modem operates at half-speed.
Transmit Level Attenuation switches (Switched Network - U.S. and Canada
only): These four switches provide 0 to -15 dB attenuation of the transmit
level in l-dB increments.
S~e
the chart below for the various switch settings
Transmit Level Switches
dBM
Level
-ldB
-2dB -4dB
-8dB
0 Off Off Off
Off
-
1
On
Off Off
Off
-
2 Off On Off Off
-
3
On
On Off Off
4
Off Off On Off
- 5
On Off On Off
6 Off On
On Off
- 7 On
On On Off
-
8 Off
Off
Off
On
- 9 On Off Off
On
- 10
Off On Off On
- 11
On On Off On
- 12 Off Off On On
- 13
On Off On
On
- 14
Off On On
On
- 15
On On On On
Encrypt/Decrypt key switch: In the horizontal position, allows a new master
key code to be entered.
Encrypt/Decrypt battery: Maintains the master key code in the 3274 when
power is off.
Figure 1-13 (Part 2 of 2). 3274 Model 51C Operator Panel with the
1200-bps Integrated Modem Feature and with
either (1) the Switched Line with Auto Answer
Feature or (2) the Nonswitched Line with SNBU
and Auto Answer Feature; and with the
Encrypt/Decrypt Feature
Section 1. Operator Information
1-29