IEEE "Telecom Profile 2008"
Gordon Muir (Deactivated)
Owned by Gordon Muir (Deactivated)
| Latest document version: | IEEE1588-2008, Annex A.9 |
|---|---|
| Location: | https://standards.ieee.org/standard/1588-2008.html |
| Objective: | Frequency distribution to better than 16ppb |
| Feature/ Parameter | Note | Range | Default Value | IEEE1588-2008 Clause | |
|---|---|---|---|---|---|
| from | to | ||||
Profile Identification | |||||
| profileName: | Recommendation for implementations in unicast networks or networks with non-PTP bridges and routers. This is an informal but often implemented profile, based on the "default" profile in Annex J.3. | Annex A.9 | |||
| profileVersion: | 1.0 | Annex J.3.1 | |||
| profileIdentifier:Â Â | 00-1B-19-00-01-00 | Annex J.3.1 | |||
| Specified by: | Precise Networked Clock Synchronization Working Group of the IM/ST Committee of the IEEE | Annex J.3.1 | |||
| Location: | https://standards.ieee.org/standard/1588-2008.html | Annex J.3.1 | |||
PTP Options | |||||
| Permitted Nodes | Ordinary clocks (i.e. Grandmasters, slave-only clocks), boundary clocks, transparent clocks | Annex A.9.1 | |||
| Prohibited Nodes | None | ||||
| Transport Mechanisms | Not specified. Any valid unicast transport mechanism may be used, e.g. as specified in Annexes D to I of IEEE1588 | Annexes D to I | |||
| Multicast or Unicast | All messages are sent in unicast. Unicast negotiation is used by default, but a management procedure could be used. | Annex A.9.3, A.9.4.2 | |||
| BMCA | Default BMCA, as specified in clause 9.3.2. | Annex A.9.4.1, J.3.3 | |||
| Path Delay Measurement | Uses delay_request/response mechanism by default. Peer delay mechanism is optional. | Annex A.9.4.2, J.3.3 | |||
| PTP Management | Optional. | Annex A.9.4.1 | |||
| Clock Identity | Standard PTP behaviour | 7.5.2.2 | |||
| Message Types | Used: Announce, Sync, Follow-up, Delay_Req, Delay_Resp, Signaling Not used: Pdelay_Req, Pdelay_Resp, Pdelay_Resp_Follow_Up The use of Management messages is permitted. | Annex A.9.4.2 | |||
| One-step and Two-step clock | Standard PTP behaviour. | ||||
| One-way and Two-way Operation | Standard PTP behaviour. | ||||
| Security | Not mentioned. | ||||
| Unicast negotiation (IEEE1588-2008 clause 16.1) | Used by default. | Annex A.9.4.2 | |||
| Path trace (IEEE1588-2008 clause 16.2) | Optional. | Annex A.9.3 | |||
| Alternate timescales (IEEE1588-2008 clause 16.3) | Not mentioned. | ||||
| Grandmaster clusters (IEEE1588-2008 clause 17.3) | Permitted, inactive by default | Annex J.3.3 | |||
| Alternate masters (IEEE1588-2008 clause 17.4) | Permitted, inactive by default | Annex J.3.3 | |||
| Unicast discovery (IEEE1588-2008 clause 17.5) | Used by default. | Annex A.9.4.2 | |||
| Acceptable master table (IEEE1588-2008 clause 17.6) | Permitted, inactive by default | Annex J.3.3 | |||
| Cumulative frequency scale factor offset (IEEE1588-2008 Annex L) | Not mentioned. | ||||
Message Rates | |||||
| Sync & Follow-up | 1 every 2 seconds to 128 per second, default 16 per second | 1/2 | 128 | 16 | A.9.4.2 |
| Delay_request/response | 1 every 64 seconds to 128 per second, default 16 per second | 1/64 | 128 | 16 | |
| Announce | 1 every 8 seconds to 8 per second; default 1 every 2 seconds | 1/8 | 8 | 1/2 | |
| Peer Delay_request/response | None (uses Delay_request/response mechanism) | ||||
| Signaling | As required for unicast negotiation | ||||
| Management | Permitted | ||||
PTP Configurable Attribute Values(all others as per PTP, defined in IEEE1588-2008) | |||||
Default data set | |||||
| twoStepFlag | Standard PTP behaviour. | ||||
| clockIdentity | Standard PTP behaviour. | ||||
| numberPorts | Standard PTP behaviour. | ||||
| clockQuality.clockClass | Standard PTP behaviour. | ||||
| clockQuality.clockAccuracy | Standard PTP behaviour. | ||||
| clockQuality. offsetScaledLogVariance | Standard PTP behaviour. | ||||
| priority1 | Default value 128. | 0 | 255 | 128 | Annex J.3.2 |
| priority2 | Default value 128. | 0 | 255 | 128 | Annex J.3.2 |
| domainNumber | Default value 0. | 0 | 127 | 0 | Annex J.3.2 |
| slaveOnly | Default value FALSE (if configurable). | FALSE | TRUE | FALSE | Annex J.3.2 |
Port data set | |||||
| portIdentity.clockIdentity | Standard PTP behaviour. | ||||
| portIdentity.portNumber | Standard PTP behaviour. | ||||
| logMinDelayReqInterval | Not used (covered by unicast negotiation - see details below) | ||||
| logAnnounceInterval | Not used (covered by unicast negotiation - see details below) | ||||
| announceReceiptTimeout | Timeout period before declaring loss of announce service (in number of missing messages) | 2 | 10 | 3 | Annex J.3.2 |
| logSyncInterval | Not used (covered by unicast negotiation - see details below) | ||||
| delayMechanism | Default mechanism is E2E (0x01) | 0x01 | Annex J.3.3 | ||
| logMinPdelayReqInterval | Not used in this profile. | ||||
| versionNumber | Always set to 2 | 2 | |||
PTP common message header flags | |||||
| alternateMasterFlag | Standard PTP behaviour. | ||||
| twoStepFlag | Standard PTP behaviour. | ||||
| unicastFlag | Standard PTP behaviour. | ||||
| PTP profile Specific1 | Standard PTP behaviour. | ||||
| PTP profile Specific2 | Standard PTP behaviour. | ||||
| Reserved | Standard PTP behaviour. | ||||
| leap61 | Standard PTP behaviour. | ||||
| leap59 | Standard PTP behaviour. | ||||
| currentUTCOffsetValid | Standard PTP behaviour. | ||||
| ptpTimescale | Standard PTP behaviour. | ||||
| timeTraceable | Standard PTP behaviour. | ||||
| frequencyTraceable | Standard PTP behaviour. | ||||
| controlField | Standard PTP behaviour. | ||||
Multicast and Unicast Operation | |||||
| Full multicast operation | Permitted, but must be inactive by default. | Annex A.9.1, A.9.4.2 | |||
| Full unicast operation | All messages are sent in unicast. | ||||
| Hybrid unicast/multicast | Not required by this profile. | ||||
| Unicast negotiation process | Both masters and slaves should support unicast negotiation (IEEE1588-2008 Clause 16.1). | Annex A.9.3, A.9.4.2 | |||
| duration field | Duration of unicast service lease | 10 | 1000 | 300 | Annex A.9.4.2 |
| logInterMessagePeriod | Suggested ranges: | Annex A.9.4.2 | |||
| -7 | 1 | -4 | |||
| -7 | 6 | -4 | |||
| -3 | 3 | 1 | |||
| R (Renewal Invited) | Standard PTP behaviour. | FALSE | TRUE | FALSE | 16.1.4.2.6 |
Master Selection Process | |||||
| BMCA type: | Default BMCA | 9.3.2 | |||
| State decision algorithm | Default state decision algorithm | 9.3.3 | |||
| Data set comparison algorithm (master selection process) | Default data set comparison algorithm | 9.3.4 | |||
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