| Feature/ Parameter | Note | Range | Default Value | C37.238-2011 Clause |
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| from | to |
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Profile Identification |
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| profileName: | IEEE Standard Profile for Use of IEEE 1588 Precision Time Protocol in Power System Applications |
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| 5.1 |
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| profileVersion: | 1.0 |
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| profileIdentifier: | 1C-12-9D-00-00-00 |
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| Specified by: | IEEE 1588 Profile for Power System Applications Working Group of the IEEE Power System Relaying Committee and IEEE Power System Substation Committee. |
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| Location: | http://standards.ieee.org |
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PTP Options |
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| Permitted Nodes | Ordinary clocks, peer-to-peer transparent clocks, boundary clocks |
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| Prohibited Nodes |
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| 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. |
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| 5.6 |
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| 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 |
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| 5.8 |
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| BMCA | Uses default BMCA specified in clauses 9.3.2, 9.3.3 and 9.3.4 of IEEE1588-2008 |
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| 5.4.1 |
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| Path Delay Measurement | Peer Delay mechanism |
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| 5.3 |
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| 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. |
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| 5.5 |
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| Message Types | Used: Announce, Sync, Follow-up, Pdelay_Req, Pdelay_Resp, Pdelay_Resp_Follow_Up
Not used: Delay_Req, Delay_Resp, Signalling, Management |
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| 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. |
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| 5.7.1 |
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| 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. |
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| Clock identity | The ALTERNATE_TIME_OFFSET_INDICATOR TLV must be supported by all devices. |
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| 5.11 |
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| Security | Annex K security not used.
Other security measures not mentioned. |
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| 5.10 |
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Unicast negotiation
(IEEE1588-2008 clause 16.1) | Not used. |
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| 5.10 |
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Path trace
(IEEE1588-2008 clause 16.2) | Not used. |
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| 5.10 |
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Alternate timescales
(IEEE1588-2008 clause 16.3) | The ALTERNATE_TIME_OFFSET_INDICATOR TLV must be supported by all devices. |
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| 5.12.1 |
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Grandmaster clusters
(IEEE1588-2008 clause 17.3) | Not used. |
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| 5.10 |
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Alternate masters
(IEEE1588-2008 clause 17.4) | Not used. |
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| 5.10 |
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Unicast discovery
(IEEE1588-2008 clause 17.5) | Not used. |
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| 5.10 |
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Acceptable master table
(IEEE1588-2008 clause 17.6) | Not used. |
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| 5.10 |
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Cumulative frequency scale factor offset
(IEEE1588-2008 Annex L) | Not used. |
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| 5.10 |
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PTP Attribute Values(all others as per PTP, defined in IEEE1588-2008) |
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Default data set |
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| domainNumber | All clock types | 0 | 127 | 0 | 5.2 |
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| clockQuality.clockClass | Grandmaster clocks | 6, 7, 187 |
| 5.9 |
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| clockQuality.clockAccuracy |
| Not specified |
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| clockQuality. offsetScaledLogVariance |
| Not specified |
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| priority1 | Grandmaster-capable clocks | 128 | 128 | 5.2 |
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| Slave-only clocks | 255 | 255 | 5.2 |
| priority2 | Grandmaster-capable clocks | 128 | 128 | 5.2 |
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| Slave-only clocks | 255 | 255 | 5.2 |
| slaveOnly | Grandmaster-capable clocks | FALSE | FALSE | 5.2 |
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| Slave-only clocks | TRUE | TRUE | 5.2 |
Port data set |
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| logAnnounceInterval | Announce message rate: 1 message/second | 0 | 0 | 5.2 |
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| announceReceiptTimeout | Preferred Grandmaster clocks: 2 missing messages | 2 | 2 | 5.2 |
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| Grandmaster-capable clocks: 3 missing messages | 3 | 3 | 5.2 |
| logSyncInterval | Sync message rate: 1 message/second | 0 | 0 | 5.2 |
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| logMinPdelayReqInterval | Pdelay_req message rate: 1 message/second | 0 | 0 | 5.2 |
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Transparent clock default data set |
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| primaryDomain |
| 0 | 127 | 0 | 5.2 |
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IEEE_C37_238 TLV |
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| Grandmaster ID | User configurable | 0x0005 | 0x00FE |
| 5.12.2 |
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| GrandmasterTimeInaccuracy | Should be better than 0.2us | 0x00000000 | 0xFFFFFFFF |
| Annex B |
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| NetworkTimeInaccuracy | Should be better than 50ns per transparent clock | 0x00000000 | 0xFFFFFFFF |
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Best Master Clock Algorithm (BMCA) |
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| BMCA type: | Default BMCA |
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| 5.4 |
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| State decision algorithm | Default state decision algorithm |
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| Data set comparison algorithm | Default data set comparison algorithm |
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