Lantronix SISPM1040-xxxx-L3 Web User Guide
33856 Rev. A https://www.lantronix.com/ 328
PTP Clock's Port Data Set Configuration
The port data set is defined in the IEEE 1588 Standard. It holds three groups of data: static members, dynamic
members, and configurable members which can be set here.
Port DataSet
Port: Static member port Identity : Port number [1..max port no].
Stat: Dynamic member portState: Current state of the port.
MDR: Dynamic member log Min Delay Req Interval: The delay request interval announced by the Master.
Peer Mean Path Del: The path delay measured by the port in P2P mode. In E2E mode this value is 0.
Anv: The interval for issuing announce messages in master state. Range is -3 to 4.
ATo: The timeout for receiving announce messages on the port. Range is 1 to 10.
Syv: The interval for issuing sync messages in master. Range is -7 to 4.
Dlm: Configurable member delayMechanism: The delay mechanism used for the port:
e2e : End to end delay measurement
p2p : Peer to peer delay measurement.
cp2p : Common Peer to peer delay measurement used in 802.1AS. There will be single instance of
common peer to peer delay measurement per port.
Can be defined per port in an Ordinary/Boundary clock. In a transparent clock all ports use the same delay
mechanism, determined by the clock type.
MPR: The interval for issuing Delay_Req messages for the port in E2e mode. This value is announced from the
Master to the Slave in an announce message. The value is reflected in the MDR field in the Slave.
The interval for issuing Pdelay_Req messages for the port in P2P mode.
Note: The interpretation of this parameter has changed from release 2.40. In earlier versions the value was
interpreted relative to the Sync interval; this was a violation of the standard, so now the value is interpreted as an
interval (i.e., MPR=0 => 1 Delay_Req pr sec) independent of the Sync rate. The valid range is -7 to 5.
Delay Asymmetry: If the transmission delay for a link in not symmetric, the asymmetry can be configured here,
see IEEE 1588 Section 7.4.2 Communication path asymmetry. Range is -100000 to 100000.
Ingress latency: Ingress latency measured in ns, as defined in IEEE 1588 Section 7.3.4.2. Range is -100000 to
100000.
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