Spectracom 8144-DD, Инструкция по эксплуатации

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Section 2: Installation
Instruction Manual 8144-DD/075020 Page 2-11
10.0 Check the front panel controls and indicators. Refer to Figure 2-4,
8144-DD Front Panel, for locations of these controls and indicators.
10.1 ALARMS and INDICATORS
The Major indicator is red if both clock sources have failed.
The Minor indicator is red if there is a failure of one clock
source. Front panel alarm indicators may be cleared with the
RESET if the clock sources have been restored. The ACO
clears remote fault indicators even though the alarm conditions
still exist.
10.2 The READY indicators are green if the corresponding clock
input is present and not in an AIS condition.
10.3 The green SELECTED indicator switch corresponds to the input
currently selected.
10.4 AUTO/MAN switch:
If revertive A priority has been selected on H16 - in the AUTO
position, a ready A clock source has priority. Failure of the A
clock switches the unit to the B clock input. When the A input
returns, the unit will switch back to the A input.
If non-revertive switching has been selected on H16 - in the
AUTO position, selected input can be A or B. Unit stays on the
selected input until an alarm causes a switch to the other input.
In the MAN position, clock selection is operator-controlled by
the A or B Select pushbuttons.
11.0 The Model 8144-DD is now operational.