Web Interface
n In addition to existing alarms, alarms relevant to PTP are trapped at Admin >
Alarms See "ADMIN - Alarms" on page 85
n PTPsettings for Daemon current state and startup can be found at Services >
Startup See "SERVICES - Startup" on page 95
Time Interval Test
The Time Interval Test feature is provided along with the PTP option in the S350.
Details of the Time Interval Test feature can be seen at TIMING > Time Interval
See "TIMING -Time Interval" on page 67
PTP and NTP Performance
The PTP daemon has the highest priority. When the PTP daemon is on it will adversely
affect the number of NTP requests the SyncServer can process.
n With PTP turned on, the amount of NTP packets the SyncServer can handle is
reduced to half or greater, depending on amount of PTP traffic.
n PTPMessage Capacity is 4000 delay_requests per second.
n NTP vs PTPCapacity: PTP is a higher priority than NTP.
PTP delay_request messages/second NTP Requests/second
10 3500
3000 2000
4000 1100
n The PTP daemon can process up to 6000 delay_reqests per second. However,
any amount over 4000 results in Web UI being unresponsive.
n If the PTP Slave NIC rate is1000BASE-T, this will result a delay of 3 micro-
seconds at the slave. It is important to note that the LAN2 port only works as
100BASE-TX, a slave that operates at a 1000BASE-T will have an issue, this
can be resolved by reducing the slaves connection speed to 100BASE-TX. See
the user manual for your slave device to determine how this can be done.
PTP Management Messages
Management Message Name Actions Supported
NULL_MANAGEMENT GET, COMMAND supported (no op)
CLOCK_DESCRIPTION GET supported
USER_DESCRIPTION GET supported
SAVE_IN_NON_VOLATILE_STORAGE COMMAND supported
RESET_NON_VOLATILE_STORAGE COMMAND supported
INITIALIZE COMMAND supported
FAULT_LOG NOT SUPPORTED
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