Avaya S8700 Maintenance Manual page 244

LED Interpretation
TN1654 Circuit Pack LEDs
The TN1654 DS1CONV board has 11 LEDs on its faceplate. The top three
system standard LEDs indicate the state of the DS1CONV board. These LEDs
are under firmware control until the board has established a link to the S8700
Media Server via the EI or SNI. Once the link is established, software controls the
three LEDs. If the link breaks, the LEDs are again under firmware control.
The red and green LEDs have the traditional meaning, where red indicates an
alarm condition, and green indicates testing in progress. The red and green LEDs
are also turned on during circuit pack initialization by firmware. When the control
link to the circuit pack is lost, firmware controls the red LED to indicate an alarm
condition.
The yellow LED under firmware control is used to indicate the state of the physical
fiber interface, the Fiber Channel (link to EI or SNI), the DS1 Control Channel (link
to opposite DS1CONV board), and the S8700 Media Server communications link
in the following manner and order of priority. (The yellow LED remains on for
longer periods of time as the DS1CONV complex becomes closer to being fully
operational.)
1. If the fiber is Out of Frame or if a Fiber Loss of Signal condition exists, the
yellow LED will flicker at a 5 Hz rate (on for 100 mS, off for 100 mS).
2. If the fiber channel is down (DS1 Converter circuit pack/fiber endpoint
communications), the yellow LED will flash at a 1 Hz rate (on for 500 ms,
off for 500 ms).
3. If the DS1 control channel is down between the two DS1CONVs in the
DS1CONV complex, the yellow LED will pulse at a 0.5 Hz rate (on for 1
second, off for 1 second).
4. If the S8700 Media Server communications link is down, the yellow LED
will wink off every 2 seconds for 200ms (2 sec on, 200 msec off).
5. If all is well with the fiber interface and every communications channel, the
yellow LED will remain on continuously in a standard- or high-reliability
system configuration. In critical-reliability systems (duplicated PNC), an
active DS1CONV circuit pack will have its yellow LED on continuously, and
a standby DS1CONV circuit pack will have its yellow LED off. The LED will
then be under software control.
The bottom four green LEDs on the TN574 DS1CONV board are under hardware
control. The four green LEDs indicate, for each DS1CONV facility, whether a
receive signal is present for the DS1 facility
The next four LEDs on the TN1654 DS1CONV board are labeled STATUS LEDs
and are for future use. These LEDs will not be lit.
6-12 Issue 1 May 2002 555-233-143