60 Functional Description TB8100 Installation and Operation Manual
© Tait Electronics Limited June 2005
PMU Standby
Operation
In Deep Sleep mode, the second means of reducing PMU current
consumption takes effect. The PMU microprocessor turns the DC-DC
converter off, removing all power to the PA. Only the reciter and the control
panel receive power (see Figure 4.9 on page 67 for details).
The PA LEDs go off. The PMU’s green Power LED also goes off, but the
red Alarm LED flashes briefly about every 20 seconds (these LEDs are only
visible when the subrack front panel is removed).
Control Panel
Shutdown
In Sleep and Deep Sleep modes, the reciter instructs the Power Save control
panel to shut down. This turns off most of its circuitry (fan detection, I
2
C
interface, RS-232). However, it is still monitoring the RS-232 lines for
activity.
Note The Power Save control panel does not shut down in Sleep and
Deep Sleep modes if the reciter is fitted with a TaitNet RS-232
system interface board (TBA10L0).
The red alarm LED goes off. This means that it cannot light up if an alarm
is generated. If an alarm is present when the control panel shuts down, it
cannot be displayed.
The Power LED flashes under hardware control to indicate that the base
station is in Sleep or Deep Sleep mode.
If the base station needs to communicate with an Alarm Center, or a Service
Kit attempts to connect, activity is detected on the RS-232 lines and the
Control Panel turns itself on. Immediately after the Service Kit disconnects,
the Control Panel shuts itself down again.
Note The standard and dual base station control panels cannot shut
themselves down, but their LEDs (except the Power LED) also
flash in Sleep and Deep Sleep modes.
12V PA Operation Power Saving is also available in base stations using a 12V PA. Both Sleep
and Deep Sleep modes can be configured, with the same receiver cycling
and Tx keyup options as a base station with a PMU. In Deep Sleep mode,
the reciter shuts down the PA by shutting down the boost regulator board
in the PA (refer to “12V PA Power Saving Control Connection” on
page 124 for more information on this connection). The 12VDC output
from the boost regulator board is unswitched and continues to power the
reciter even when the rest of the circuitry on the board is shut down.
4.8.2 Power Saving Modes
The Power Saving Modes licence makes two power saving modes available:
Sleep and Deep Sleep. The base station runs in Normal mode when there
is activity on the channel but can transition to Sleep and/or Deep Sleep
mode after it has been idle for a period of time.
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