Motorola PTP 500 User's Guide Page 437

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PTP 300 and PTP 500 Series User Guide Testing PTP-SYNC
phn-1115_006v000
Sep 2010
8-17
Testing PTP-SYNC
Refer to Table 1-6 for descriptions of the PTP-SYNC LEDs.
LEDs do not illuminate
Ensure that there is a cable connection between the PIDU Plus ‘ODU’ interface and
the ‘PIDU IN’ interface of the PTP-SYNC unit.
The ‘STATUS’ LED does not blink
This probably indicates that a 1PPS synchronization pulse is not detected by the PTP-
SYNC unit (no satellite lock).
Depending on system configuration, take one of the following actions:
System using a GPS receiver module - Ensure that there is a cable connection
between the PTP-SYNC ‘GPS/SYNC IN’ interface and the LPU, also that there is a
cable connection between the LPU and the GPS receiver module. Check that the
GPS receiver module has an uninterrupted view of the sky.
System using an alternative 1PPS timing source - Ensure that there is a cable
connection between the PTP-SYNC ‘GPS/SYNC IN’ or ‘1PPS IN’ interface and the
1PPS timing source.
On cluster slave units – Ensure that there is a cable connection between the slave
GPS/SYNC IN interface and the SYNC OUT interface of the preceding unit in the
chain.
The ‘ODU’ LED does not illuminate within 90 seconds of power-
up
This probably indicates that there is no communication between PTP-SYNC and ODU
Ensure that the PTP-SYNC ‘ODU OUT’ interface is connected to the ODU (and LPUs if
installed) via the drop cable .
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