v1.12
Cloudberry Management – PTP Management User Manual
- 18 -
Section
Description
GPS settings
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Disable
GPS is disabled.
The unit will start counting from the last set time in memory.
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Internal
Internal GPS is enabled.
The unit will synchronize to GPS time and will not act as
master until GPS lock and GPS sync is achieved.
An antenna must be connected for GPS to achieve signal
(QN on rugged CM-1600, BNC on RJ-45 versions)
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External GPS
External GPS enabled. The internal GPS is disabled. The
interface to the GPS is then via a serial connection and a
PPS interface. Serial settings must also be configured.
Note that not any GPS may be used since they often have
proprietary configuration protocols. Contact OnTime
Networks if a different GPS than the standard one shall be
used. A firmware update may be necessary.
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GPS cable length
Specify the GPS cable length in meter [m].
This parameter is meant for compensating for the static
offset a GPS cable introduces. The propagation delay of the
signal in a GPS cable is approximately 5ns/m, which is the
offset introduced per meter of cable.
Section
Description
Regulator settings
The SC uses a PI regulator when synchronizing to master
time. This regulator is tunable by the parameters below.
-
Proportional part
Default value 0.8
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Integral part
Default value 0.1
