Szablon: Webnative ptp
Z Elproma Wiki Knowledge Base
The PTP page of {{{model}}} time server is used to configure and run PTP protocol.
Switching on PTP enables PTP grandmaster daemon.
PTP options
| Option name | Value type/possible values | Description |
|---|---|---|
| PTP | Disabled/Grandmaster/Slave | Enabled PTP as Master/Slave. |
| PTP Options | ||
| Domain number | Number [0...255] | A domain does define the scope of PTP message communication, state, operations, data sets, and timescale. Devices synchronize only to PTP devices within same domain. Multiple domains mayy be used in signle network. |
| Profile | IEEE1588/802.1AS | Defines whether synchronization is performed using standard PTP (IEEE1588) or gPTP (802.1AS). |
| Transport layer | L2/L4 | L2 (Ethernet): PTP packets are encapsulated directly in Ethernet frames (IEEE 802.3 network transport)
L4 (UDP): PTP packets are exchanged over UDP/IPv4 |
| IP mode | multicast/unicast/hybrid | |
| Delay mechanism | E2E/P2P | E2E: Delay is measured end-to-end. Delay is calculated for the whole path
P2P: Delay is measured peer-to-peer. If transparent clocks are present in a network, they need to support peer-delay mechanism (and have it enabled) |
| gPTP Slave type | Slave-only/Master-capable | Defines whether gPTP Slave device may become a Master in the network in case there is no other available. Cannot become Grandmaster. |
| PTP Master configuration | ||
| Priority1 | Number [0...255] | The attribute priority1 is used in the execution of the best master clock algorithm. Lower values take precedence. This is primarily checked field in best master clock algorithm. |
| Priority2 | Number [0...255] | The attribute priority2 is used in the execution of the best master clock algorithm. Lower values take precedence. This field is after clock class, accuracy and variance. |
| Sync interval | Number (log2) [-7...7] (recommended [-3...3]) | Interval for PTP Sync messages to be sent.
Unit used is log2 (logarithm 2), e.g. -4: 62.5ms (1/16 s) -3: 125ms (1/8 s) -2: 250ms (1/4 s) -1: 0.5s (1/2 s) 0: 1 second (typical interval) 1: 2 seconds (default) 2: 4 seconds 3: 8 seconds 4: 16 seconds NOTE: Editing this and following attributes must be done with caution. |
| Announce interval | Number (log2) | Interval for PTP Announce messages to be sent. |
| Min Delay Request Interval | Number (log2) | Interval for PTP Delay_Request messages to be sent to host. |
| Min pDelay Request Interval | Number (log2) | Interval for PTP Peer_Delay_Request messages to be sent to host. |
| Sync receipt timeout | Number (log2) | Timeout value of PTP Sync messages. Defines for how long obtained time is marked as valid. |
| PTP Grandmaster dataset | ||
| Grandmaster dataset mode | Auto/Manual | Allows selection between constant UTC-TAI offset and automatically calculated measured one. Usage of this (manual) is for testing purposes mostly. |
| UTC Offset Valid | Valid/Invalid | Allows to mark whether custom UTC-TAI offset shall be marked as valid. |
| UTC offset | Number | Defines custom UTC-TAI offset if used. |
Additional settings: (available via SSH only)
- All settings listed in https://linux.die.net/man/8/ptp4l, located in
/etc/ptp4l.cfgfile on system. Note that some are automatically adjusted by software.
[[Category:{{{model}}} User Manual]]