Chapter 8: Troubleshooting
Testing PTP-SYNC
Page 8-17
Table 236 Clustered PTP-SYNC units - GPS LEDs Fault-finding
Cluster timing source
GPS LED on
master
GPS LED on
slave(s)
Diagnosis
GPS receiver providing
NMEA data
Blink
Blink
OK
Off
Any
Fault in GPS unit or GPS cable
Blink
Off
Fault in daisy chain cable
Alternative 1PPS
source, no NMEA data
Off
Off
OK
Off
On
Fault in alternative 1PPS source
One ODU is cluster
timing master
Off
Off
OK