Test the System
LED Indicators
SI Installation and Upgrades
485
June 2004
Circuit Pack LEDs
Typically, each circuit pack has 3 LEDs on the front panel. The
table describes the red, green, and yellow LEDs and their meaning. Also see
Figure 179, Circuit Pack
LEDs on Faceplate,
on page 486.
DS1 Converter Circuit Pack LEDs
Eleven LEDs provide an indication of the state of the
Figure 180, TN1654 DS1 Converter Circuit Pack
LEDs,
on page 487 and the T1/E1 facilities. The top group has the standard red, green and yellow LEDs.
The red LED indicates an alarm condition and the green LED indicates testing in progress. The 4 SPAN
LEDs indicate the status of the T1/E1 facilities. The four STATUS LEDs are currently unused and remain
off.
The yellow LED is used to indicate the state of the fiber interface, the fiber channel, the control channel,
and the communications link to the SPE in the following manner and order of priority. See
DS1
Converter Yellow LED Flashing States
on page 487
SPAN LEDs
The 4 SPAN LEDs indicate the status of the 4 T1/E1 facilities. A SPAN LED is in one of the following
states:
•
Solid on yellow: Facility is operational and alarm free.
•
Blinking yellow for 2 seconds, off 0.1 seconds: Facility is operational and alarm free AND is
carrying the control channel (facility A or B only).
•
Solid on red: Facility is alarmed.
•
Solid off: Facility is not administered or has been busied out.
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.
CAUTION:
To prevent unnecessary trouble tickets, do not enable the system alarms (Alarm
Origination feature) until all installation and administration procedures are completed.
