Chapter 8: Troubleshooting
Testing PTP-SYNC
Page 8-15
Testing PTP-SYNC
This section describes how to test the PTP-SYNC unit and its connections when the PTP-SYNC
LEDs do not illuminate correctly, or when a synchronization fault is suspected.
Checking the PTP-SYNC LEDs
If a fault is suspected in the PTP-SYNC or GPS hardware, check the PTP-SYNC LED states and
use
to choose the correct test procedure.
Table 235 PTP-SYNC indicator LED states
LED
State
Description and test procedure
GPS
Off
No GPS satellite data being received at the GPS/SYNC IN
port. Refer to
GPS LED does not illuminate or blink on
On steady or blink
GPS satellite data being received.
SYNC
Off
No data being received at the SYNC OUT port.
On steady or blink
Data being received at the SYNC OUT port.
The SYNC LED does not normally illuminate, even in cluster
configurations.
STATUS
Off
On steady
Power but no satellite lock. Refer to
Blink
Power and satellite lock at either the GPS/SYNC IN or 1PPS
IN port.
Double blink
Possible fault in GPS/SYNC IN or 1PPS IN cables. Refer to
ODU
Off
No signal being received from the ODU. Refer to
does not illuminate within 90 seconds
On
Communication with the ODU is established.
Blink red
Error in communication with ODU. Refer to
LEDs do not illuminate
Meaning: The PTP-SYNC unit is not powered up.
Action: Ensure that there is a cable connection between the PSU ODU interface and the PIDU IN
interface of the PTP-SYNC unit. Confirm that the PSU is powered up.