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| Feature/ Parameter | Note | Range | Default Value | C37.238-2011 Clause | |
|---|---|---|---|---|---|
| from | to | ||||
Profile Identification | |||||
| profileName: | IEEE Standard Profile for Use of IEEE 1588 Precision Time Protocol in Power System Applications | 5.1 | |||
| profileVersion: | 1.0 | ||||
| profileIdentifier: | 1C-12-9D-00-00-00 | ||||
| Specified by: | IEEE 1588 Profile for Power System Applications Working Group of the IEEE Power System Relaying Committee and IEEE Power System Substation Committee. | ||||
| Location: | http://standards.ieee.org | ||||
PTP Options | |||||
| Permitted Nodes | Ordinary clocks, peer-to-peer transparent clocks, boundary clocks | ||||
| Prohibited Nodes | |||||
| Transport Mechanisms | IEEE 802.3 Ethernet, as per IEEE1588-2008 Annex F (PTP directly over Ethernet). VLAN tags (IEEE802.1Q) are mandatory, with a default priority of 4, and default VLAN ID of 0. Other transport mechanisms are prohibited. | 5.6 | |||
| Multicast or Unicast | Full multicast operation, using MAC addresses specified in IEEE1588-2008 Annex F: - Uses MAC address 01-80-C2-00-00-0E for Pdelay messages - Uses MAC address 01-1B-19-00-00-00 for other messages | 5.8 | |||
| BMCA | Uses default BMCA specified in clauses 9.3.2, 9.3.3 and 9.3.4 of IEEE1588-2008 | 5.4.1 | |||
| Path Delay Measurement | Peer Delay mechanism | 5.3 | |||
| PTP Management | Management specified by way of a SNMP MIB - Grandmaster support for SNMP MIB is mandatory - SNMP support for other devices is optional - Ordinary clocks not supporting SNMP must provide the following information: TimeInaccuracy, traceability, offset from GM, alarm if offset from GM reaches a configurable limit. | 5.5 | |||
| Message Types | Used: Announce, Sync, Follow-up, Pdelay_Req, Pdelay_Resp, Pdelay_Resp_Follow_Up Not used: Delay_Req, Delay_Resp, Signalling, Management | ||||
| One-step and Two-step clock | One-step operation is recommended, although two-step operation is allowed. All ingress ports must support both one-step and two-step clocks. All egress ports may support either one-step or two-step clocks. | 5.7.1 | |||
| One-way and Two-way Operation | One-way Sync message operation due to use of peer delay messages. Two-way operation for peer delay messages. | ||||
| Clock identity | The ALTERNATE_TIME_OFFSET_INDICATOR TLV must be supported by all devices. | 5.11 | |||
| Security | Annex K security not used. Other security measures not mentioned. | 5.10 | |||
| Unicast negotiation (IEEE1588-2008 clause 16.1) | Not used. | 5.10 | |||
| Path trace (IEEE1588-2008 clause 16.2) | Not used. | 5.10 | |||
| Alternate timescales (IEEE1588-2008 clause 16.3) | The ALTERNATE_TIME_OFFSET_INDICATOR TLV must be supported by all devices. | 5.12.1 | |||
| Grandmaster clusters (IEEE1588-2008 clause 17.3) | Not used. | 5.10 | |||
| Alternate masters (IEEE1588-2008 clause 17.4) | Not used. | 5.10 | |||
| Unicast discovery (IEEE1588-2008 clause 17.5) | Not used. | 5.10 | |||
| Acceptable master table (IEEE1588-2008 clause 17.6) | Not used. | 5.10 | |||
| Cumulative frequency scale factor offset (IEEE1588-2008 Annex L) | Not used. | 5.10 | |||
PTP Attribute Values(all others as per PTP, defined in IEEE1588-2008) | |||||
Default data set | |||||
| domainNumber | All clock types | 0 | 127 | 0 | 5.2 |
| clockQuality.clockClass | Grandmaster clocks | 6, 7, 187 | 5.9 | ||
| clockQuality.clockAccuracy | Not specified | ||||
| clockQuality. offsetScaledLogVariance | Not specified | ||||
| priority1 | Grandmaster-capable clocks | 128 | 128 | 5.2 | |
| Slave-only clocks | 255 | 255 | 5.2 | ||
| priority2 | Grandmaster-capable clocks | 128 | 128 | 5.2 | |
| Slave-only clocks | 255 | 255 | 5.2 | ||
| slaveOnly | Grandmaster-capable clocks | FALSE | FALSE | 5.2 | |
| Slave-only clocks | TRUE | TRUE | 5.2 | ||
Port data set | |||||
| logAnnounceInterval | Announce message rate: 1 message/second | 0 | 0 | 5.2 | |
| announceReceiptTimeout | Preferred Grandmaster clocks: 2 missing messages | 2 | 2 | 5.2 | |
| Grandmaster-capable clocks: 3 missing messages | 3 | 3 | 5.2 | ||
| logSyncInterval | Sync message rate: 1 message/second | 0 | 0 | 5.2 | |
| logMinPdelayReqInterval | Pdelay_req message rate: 1 message/second | 0 | 0 | 5.2 | |
Transparent clock default data set | |||||
| primaryDomain | 0 | 127 | 0 | 5.2 | |
IEEE_C37_238 TLV | |||||
| Grandmaster ID | User configurable | 0x0005 | 0x00FE | 5.12.2 | |
| GrandmasterTimeInaccuracy | Should be better than 0.2us | 0x00000000 | 0xFFFFFFFF | Annex B | |
| NetworkTimeInaccuracy | Should be better than 50ns per transparent clock | 0x00000000 | 0xFFFFFFFF | ||
Best Master Clock Algorithm (BMCA) | |||||
| BMCA type: | Default BMCA | 5.4 | |||
| State decision algorithm | Default state decision algorithm | ||||
| Data set comparison algorithm | Default data set comparison algorithm | ||||
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