Technology Overview
PTP Software Technology
The Precise Time Protocol is specified by the IEEE. The organization has rather strict rules on interpreting the Standards. No individual or organization can issue official interpretations or provide definitive answers to questions of interpretation. This must be done by an IEEE authorized committee. Even this committee cannot extend, correct, or change the standard-this must be done by ballot.
Conformance with IEEE 1588 - 2008 Specification
Protocol Implementation Conformance
The Conemtech PTP software from the beginning based on the ZHAW’s portable PTPv2 Protocol Software. This software has been further developed and the following constitutes the Implementation (at date specified):
Implementation according to the IEEE 1588 - 2008
Status: 2011-05-12
x = implemented
1 = in development, to be released
0 = no current plan to implement
| Clock mode | x/1/0 |
|---|---|
| One-step | x |
| Two-step | x |
| Network transport protocol | |
| UDP/IPv4 | x |
| IEEE 802.3 | x |
| Variance algorithm | 0 |
| Computation of offsetScaledLogVariance | 0 |
| State machine | |
| full | x |
| slave-only | x |
| best master clock algorithm (BMC) | x |
| Delay mechanism | |
| E2E | x |
| P2P | x |
| Management | |
| NULL_MANAGEMENT | x |
| CLOCK_DESCRIPTION | x |
| USER_DESCRIPTION | x |
| SAVE_IN_NON_VOLATILE_STORAGE | x |
| RESET_NON_VOLATILE_STORAGE | x |
| INITIALIZE | x |
| FAULT_LOG | 0 |
| FAULT_LOG_RESET | 0 |
| DEFAULT_DATA_SET | x |
| CURRENT_DATA_SET | x |
| PARENT_DATA_SET | x |
| TIME_PROPERTIES_DATA_SET | x |
| PORT_DATA_SET | x |
| PRIORITY1 | x |
| PRIORITY2 | x |
| DOMAIN | x |
| SLAVE_ONLY | x |
| LOG_MEAN_ANNOUNCE_INTERVAL | x |
| ANNOUNCE_RECEIPT_TIMEOUT | x |
| LOG_MEAN_SYNC_INTERVAL | x |
| VERSION_NUMBER | x |
| ENABLE_PORT | x |
| DISABLE_PORT | x |
| TIME | x |
| CLOCK_ACCURACY | x |
| UTC_PROPERTIES | x |
| TRACEABILITY_PROPERTIES | x |
| TIMESCALE_PROPERTIES | x |
| UNICAST_NEGOTIATION_ENABLE | 1 |
| PATH_TRACE_LIST | 0 |
| PATH_TRACE_ENABLE | 0 |
| MASTER_CLUSTER_TABLE | 0 |
| UNICAST_MASTER_TABLE | 1 |
| UNICAST_MASTER_MAX_TABLE_SIZE | 1 |
| ACCEPTABLE_MASTER_TABLE | 1 |
| ACCEPTABLE_MASTER_TABLE_ENABLED | 1 |
| ACCEPTABLE_MASTER_MAX_TABLE_SIZE | 1 |
| ALTERNATE_MASTERalternateMaster | 0 |
| ALTERNATE_TIME_OFFSET_ENABLE | 1 |
| ALTERNATE_TIME_OFFSET_NAME | 1 |
| ALTERNATE_TIME_OFFSET_MAX_KEY | 1 |
| ALTERNATE_TIME_OFFSET_PROPERTIES | 1 |
| TRANSPARENT_CLOCK_DEFAULT_DATA_SET | 0 |
| TRANSPARENT_CLOCK_CURRENT_DATA_SET | 0 |
| TRANSPARENT_CLOCK_PORT_DATA_SET | 0 |
| PRIMARY_DOMAIN | x |
| DELAY_MECHANISM | x |
| LOG_MIN_MEAN_PDELAY_REQ_INTERVAL | x |
| Optional features | x/1/0 |
|---|---|
| Unicast message negotiation (optional) | 1 |
| Path Trace | 0 |
| Alternate timescales | 1 |
| Master cluster | 0 |
| Alternate master | 0 |
| Unicast discovery | 1 |
| Acceptable master table | 1 |
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Conemtech AB
Torshamnsgatan 35
SE-164 40 Kista
Sweden
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