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Operation with
Master Time
System
Reports
Malfunction
END
Controls and Indicators
CCM Control
Panel
70 1780 Time
Generator IBu//er
•
When the MASTER-INTERNAL switch is placed in the MASTER position,
the clock can be driven from and synchronized with an external minute-
impulse master time system. The time register is incremented by an
impulse received each minute from the master time system, instead of
from its own time pulse. When the time record reaches (optionally) either
the 58th (XX.96) or 59th (XXo98) minute, the time register does not incre-
ment until an hourly correction signal has been received from the master
time system o Upon receipt of a subsequent minute impulse, the time register
increments (optionally) to the 59th or 60th minute.
If
the hourly cor-
rection signal arrives early relative to the status of the time register,
the register is incremented to the proper time on the subsequent minute
impulse.
When a master time system is used, the TGB must be syn-
chronized to the exact time of the master time clock or be displaced from
it in increments of 60 minutes.
•
The Report signals to the CeM are encoded by the Time Generator/
Buffer to indicate the following conditions:
Malfunction (MR)
END
•
When a Receive command is present in the Time Generator/Buffer prior
to END,·the buffer indicates a malfunction condition to the CCM via an MR
whenever:
The START-STOP switch is set to the STOP position,
or optionally,
two successive internal time pulses have occurred in the absence of an
external minute- impulse
0
After an MR, the buffer drops the command which was present and is
conditioned to receive a new command.
•
The Time Generator/Buffer reports END after receipt of a TERC from
the CCMo
•
The operator's controls and indicators for the Time Generator/Buffer
are located on the CCM Control Panel.
Data (White indicator) -
This indicator is lighted whenever a Re-
ceive command is present in the buffer.
Select (patch panel) -
The Time Generator/Buffer is easily connected
to any CCM Select (SEL) line, and is thereby enabled if power is ono
When enabled, the buffer responds to an SEL with BOP.
4-46
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