Avaya S8700 Maintenance Manual page 1410

Maintenance-Object Repair Procedures
DS1 CONV LEDs
The TN574 board has seven LEDs on its faceplate. The TN1654 board has
eleven LEDs on its faceplate. The top three system standard LEDs are used to
provide an indication of the state of the DS1 CONV board. These LEDs are under
firmware control until the board has established a link to the 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 use where red means an alarm
condition and green indicates that maintenance testing is in progress. The red
and green LED is 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 amber LED under firmware control is used to indicate the state of the:
Physical fiber interface
Fiber channel (link to EI or SNI)
DS1 control channel (link to opposite DS1 CONV board)
Server communications link
in the following manner and descending order of priority. (The amber LED stays lit
longer as the DS1 CONV complex approaches full operation.)
1. If the fiber is out of frame or is in a loss-of-signal condition, the amber LED
will flicker at a 5-Hz rate (on for 0.1 second, off for 0.1 second).
2. If the fiber channel is down (DS1 Converter circuit pack/fiber endpoint
communications), the amber LED will flash at a 1-Hz rate (on for ½ second,
off for ½ second).
3. If the DS1 control channel is down between the two DS1 CONVs in the
DS1 CONV complex, the amber LED will pulse at a 1/2-Hz rate (on for 1
second, off for 1 second).
4. If the media server communications link is down, the amber LED will wink
off every 2 seconds for 200 msec (2 seconds on, 0.2 second off).
5. If all is well with the Fiber Interface and every communications channel, the
amber LED will remain on continuously in a duplex-, or high-reliability
system. In a critical-reliability system (duplicated PNC):
— An active DS1 CONV circuit pack's amber LED remains on
— A standby DS1 CONV circuit pack's amber LED remains off.
The LED will then be under software control.
The bottom four green LEDs on the TN574 DS1 CONV board are under hardware
control. The four green LEDs indicate, for each DS1 CONV facility, whether a
receive signal is present for the DS1 facility.
8-688 Issue 1 May 2002
continuously.
555-233-143