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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Test the System
Page 4-16LED Indicators
4
Figure 4-2. TN1654 DS1 Converter Circuit Pack LEDs
LEDs on Standby Components
In high and critical reliability systems, duplicated components on standby usually
have the yellow LEDs off, with the following exceptions:
■ The major, minor and warning alarm LEDs on the SYSAM circuit pack on
the standby SPE do not give reliable indications. Note only LEDs on the
active SYSAM circuit pack.
■ The yellow LED blinks on and off when the standby processor circuit pack
is up and standby maintenance is running.
■ In high reliability systems with a Center Stage Switch, (duplicated SPE,
simplex PNC), the standby Switch Node clock’s yellow LED is off. In
critical reliability systems, the standby SNC is located on a separate
carrier and normally remains lit.
■ Yellow LEDs on power units on standby carriers normally remain lit.
Figure Notes
1. Alarm LED (Red)
2. Test LED (Green)
3. Busy LED (Yellow)
4. STATUS LEDs
5. SPAN LEDs