DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
LED Interpretation
7-12DS1 CONV (TN574/TN1654) Circuit Pack LEDs
7
2. If the Fiber Channel is down (DS1 Converter circu it pack/fiber end point
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 t he SPE co mmuni cati ons l ink is down , the y ello w LED wi ll win k off e very
2 seconds for 200 ms (2 sec onds on, 200 ms off).
5. If all is well with the Fiber Interface and all communications chan nels, the
yellow LED will remain on continuously in a Standard Reliabil ity and High
Reliability System configuration. In Critic al Reliability systems (dup licated
PNC), an active DS1CONV circuit pack will have its yellow LED on
continuously, and a standby DS1CONV circ uit pack will have its yello w
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 D S1 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.
The bottom four LEDs on the TN1654 board are labeled SPAN LEDs. T hese LE Ds
are under firmware control. If the facili ty is not administered, then the LED is not
lit. The LED is lit amber if the facility is running alarm free. If the f acility is
detecting either a red alarm (loss-of-signal or loss-of-frame), a yellow a larm
(remote frame alarm) or a blue alarm (AIS signal) then the L ED is lit red. The
SPAN SELECT Switch on the TN1654 faceplate is for future use. Pushing the
switch will have no effect on the boa rd. See Figure 7-4 for a view of the face plate
on the TN1654 DS1CONV circuit pack