Specifications

Chapter 6 TR-08 Option
6-9
LEDS FOR TR-08 OPERATION
The function of the front panel Test, Status and T1 LEDs remains unchanged from D4 or ESF
operation. However, the significance of the framing LED has changed as follows (listed by
decreasing order of priority):
Flashing Red: Out of Frame Condition
Flashing Yellow: Loss of Data Link
Red: Receiving Major Alarm
Yellow: Receiving Minor Alarm
Table 7-2: Summary of Front Panel LED Patterns under TR-08 Operation
Off Yellow Green Green
Red Yellow Green Green
Yellow Yellow Green Green
Green Green Green Green
Red Green Green Green
Off Yellow Green Red
Off Green Green Yellow
Yellow Yellow Green Green
Off Yellow Red Flashing Red
Off Yellow Green Flashing Red
Off Yellow Green Flashing
Yellow
Off Green Yellow Green
Off
then
Off
Green
then
Yellow
Yellow
then
Yellow
Green
then
Green
Off Yellow Yellow Green
Switch 7 is on; unit is in trunk processing
Switch 7 and self-test are on; test tone overrides
trunk processing
Unit is in network loopback
Unit has successfully passed self test with analog
cards present in the unit.
Unit has successfully passed self test with no analog
cards present in the unit.
Unit is receiving a major alarm from the CO switch.
Unit is receiving a minor alarm from the CO switch.
Unit is receiving an A shelf far end loop back
(A FELP); there is no indication for B FELP,
C FELP, D FELP, or P FELP.
The unit has sensed a loss of signal (LOS) and has
sent an A Shelf alarm followed by a major alarm a
fraction of a second later.
The unit has sensed an Out of Frame (OOF) and has
sent an A Shelf alarm followed by a major alarm
approximately 2.5 seconds later.
The unit has sensed a Loss of Data Link
framing) and has sent an A Shelf alarm followed
by a major alarm approximately 2.5 seconds later.
The unit has not surpassed the set BPV threshold,
and is in normal operation.
This toggling state indicates the unit is receiving
BPVs at approximately the set threshold value.
The unit is receiving BPVs in excess of the
set BPV threshold.
Test LED
Color
Status
LED
Color
T1 LED
Color
Framing
LED
Interpretation