Tait TB8100 Installation And Operation Manual

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Tait TB8100 Installation And Operation Manual Manual pdf 60 page image

60 Functional Description TB8100 Installation and Operation Manual© Tait Electronics Limited June 2005PMU StandbyOperation In Deep Sleep mode, the second means of reducing PMU currentconsumption takes effect. The PMU microprocessor turns the DC-DCconverter off, removing all power to the PA. Only the reciter and the controlpanel 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 thered Alarm LED flashes briefly about every 20 seconds (these LEDs are onlyvisible when the subrack front panel is removed).Control PanelShutdown In Sleep and Deep Sleep modes, the reciter instructs the Power Save controlpanel to shut down. This turns off most of its circuitry (fan detection, I 2 Cinterface, RS-232). However, it is still monitoring the RS-232 lines foractivity.Note The Power Save control panel does not shut down in Sleep andDeep Sleep modes if the reciter is fitted with a TaitNet RS-232system interface board (TBA10L0).The red alarm LED goes off. This means that it cannot light up if an alarmis generated. If an alarm is present when the control panel shuts down, itcannot be displayed.The Power LED flashes under hardware control to indicate that the basestation is in Sleep or Deep Sleep mode.If the base station needs to communicate with an Alarm Center, or a ServiceKit attempts to connect, activity is detected on the RS-232 lines and theControl 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 shutthemselves down, but their LEDs (except the Power LED) alsoflash in Sleep and Deep Sleep modes.12V PA Operation Power Saving is also available in base stations using a 12V PA. Both Sleepand Deep Sleep modes can be configured, with the same receiver cyclingand 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 boardin the PA (refer to “12V PA Power Saving Control Connection” onpage 124 for more information on this connection). The 12VDC outputfrom the boost regulator board is unswitched and continues to power thereciter even when the rest of the circuitry on the board is shut down.4.8.2 Power Saving ModesThe Power Saving Modes licence makes two power saving modes available:Sleep and Deep Sleep. The base station runs in Normal mode when thereis activity on the channel but can transition to Sleep and/or Deep Sleepmode after it has been idle for a period of time.