Motorola PTP 500 User's Guide Page 438

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Testing PTP-SYNC Chapter 8 Troubleshooting
phn-1115_006v000
8-18
Sep 2010
The ‘GPS’ LED does not illuminate or blink on clustered PTP-
SYNC units
This indicates a fault only when the timing source is a GPS receiver.
Table 8-2 describes the action to be tak
en depending upon the behavior of the ‘GPS’
LEDs at the master and slave(s).
Table 8-2 Clustered PTP-SYNC units - ‘GPS’ LEDs Fault-finding
Cluster timing
source
‘GPS’ LED on
master
‘GPS’ LED on
slave(s)
Diagnosis
Blink Blink OK
Off Any Fault in GPS unit or
GPS cable
GPS receiver
providing NMEA
data
Blink Off Fault in daisy chain
cable
Off Off OK Alternative 1PPS
source, no NMEA
data
Off On Fault in alternative
1PPS source
One ODU is
cluster timing
master
Off Off OK
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