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Indicators
There are several LEDs on the front panel of UCT cards providing information about
synchronization clock operation and DECT multi-site synchronization:
Note: The "S.DECT" and "MST DECT" LEDs are absent from the UCTS-12 and UCT-C front
panel.
Note: On the NeXspan D, the "S.DECT" and "MST DECT" LEDs are presents from the IUCT-D
card front panel.
LED
S.EXT
ON green
(green/red)
OFF
S.DECT
ON green
(green/red)
ON red
Flashes green
Flashes red
MST DECT
ON
(green)
Tableau 7 : Meaning of UCT/IUCT-D card synchronization LEDs
•
Operation in Simplex mode
1
Normal operation: the master is synchronized on the network (S.EXT, S.DECT and
MST.DECT LEDs lit). The slaves receive the DECT synchronization signal from the master
(S.DECT LED lit green).
2
Break in the cable between the master and the first slave: the slave detects a malfunction
(S.DECT LED lit red); after a few moments the slave becomes master and generates its own
synchronization to the other slaves (S.DECT and MST DECT LEDs lit).
•
Operation in Duplex mode
1
Normal operation: it is assumed that the two masters, "priority" and "not priority", are
connected to the PSTN network. The priority master supplies the entire multi-site network
with the synchronization single (S.EXT, S.DECT and MST.DECT LEDs lit). The "not priority"
master and the slaves reeceive the DECT synchronization signal from the priority master
(S.DECT and S.EXT LEDs lit on the not priority master, and S.DECT LED lit green on the
slaves).
2
The link between the "priority" master and the PSTN is broken (S.EXT LED out). This
information is sent (see wiring in section 7.4.3) to the "not priority" master. The "not priority"
master takes over, becomes master and supplies the synchronization signal (S.EXT,
S.DECT and MST.DECT LEDs lit) to the entire network (S.DECT LED lit green on "priority"
master and slaves).
AMT/PTD/PBX/0020/2/4/EN
STATE
Network synchronization clock correct
synchronization clock fault alarm
DECT synchronization correct
DECT synchronization loss alarm
synchronization search
Polarity inversion in the wiring of the DECT synchro signal
synchronization master PBX
01/2007
EXPLANATION
Page 143
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