DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
LED Interpretation
7-11DS1 CONV (TN574/TN1654) Circuit Pack LEDs
7
Figure 7-3. TN574 DS1C Circuit Pack LEDs
TN1654 Circuit Pack LEDs
The TN1654 DS1CONV board has 11 LEDs on its faceplate. The top 3 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 SPE via the EI or SNI.
Once the link is established, software controls the 3 LEDs. If the link breaks, the
LEDs are again under firmware control.
The red and green LEDs have the traditional use: red means an alarm condition,
and green indicates that maintenance testing is 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 SPE 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).
ALARM LED (RED)
TEST LED (GREEN)
BUSY LED (YELLOW)
DS1 FACILITY A
DS1 FACILITY B
DS1 FACILITY C
DS1 FACILITY D
