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Figure 2-1 shows all the operating commands used
by the IBM 2702 and 2703 Transmission Control
Units, the hexadecimal representation of the com-
mand byte sent over the IBM System/360 I/O Inter-
face, and the terminal controls that use the com-
mands. Some of the operating commands work with
the basic 2702/2703 and are independent of terminal
control type; some operating commands are not used
by all terminal controls; some operating commands
operate differently with different terminal controls.
2702 OPERATOR'S PANEL
The 2702 Operator's Panel is shown in Figures 2-2
and 2-3.
Operator Switches
Power On If in Local
This switch turns on 2702 dc power, provided the
Power Control switch is in the LOCAL or DRIVER
DEGATE position.
Power Off If in Local
This switch turns off 2702 dc power, provided the
Power Control switch is in the LOCAL or DRIVER
DEGATE position.
Meter On/Off (without Local/Remote Partitioning)
When this switch is placed in the OFF position, and
when the processor goes to a wait or halt state and
the 2702 is command-free, the 2702 goes off-line
and the 2702 usage meter stops running.
The Meter switch must be in the ON position for
the 2702 to operate on-line.
Local Partitioning
When the Local Partitioning switches or the Remote
Partitioning feature are installed, the Meter On/Off
switch is not present.
Interface A. When placed in the A CTIVE position
after a halt or wait state has been signaled, this
switch permits logical attachment to CPU A. When
placed in the INACTIVE position, this switch prevents
CHAPTER 2. OPERATIONS
the 2702 from becoming logically attached to CPU A.
If the 2702 is presently attached to CPU A, the 2702
becomes partitioned as soon as CPU A attains a halt
or wait state and channel A is unattached--for exam-
ple, the Release command has been issued to the
2702 and the 2702 is command-free.
Interface B. When placed in the ACTIVE position
after a halt or wait state has been signaled, this
switch permits logical attachment to CPU Bo When
placed in the INACTIVE position, this switch prevents
the 2702 from becoming logically attached to CPU B.
If the 2702 is presently attached to CPU B, the 2702
becomes partitioned as soon as CPU B attains a halt
or wait state and Channel B is unattached--e. g., the
Release command has been issued to the 2702 and the
2702 is command-free.
2712 Test Group 1 and 2
When the Group 1 or Group 2 switch is placed in the
LOCAL position, it permits a local high-speed wrap
operation to be performed to test the operation of the
2712 Adapter feature.
When placed in the REMOTE position, this switch
causes a high-speed wrap operation at the 2712 Multi-
plexer as well as the local wrap operation.
This switch is placed in the OPERATE position to
perform normal on-line telecommunication operations.
Operator Panel Indicators
Power-On
This indicator lights when 2702 dc power is on.
CE Test
This indicator lights when the CE Test switch at the
CE panel is depressed.
Thermal
This indicator lights when a thermal contact is open.
CB (Circuit Breaker)
This indicator lights when a 2702 power-supply cir-
cuit breaker is tripped.
Operations
2-1
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