What is PTP boundary clock?

What is a boundary clock? A boundary clock in PTP is both a slave and a master clock. It will take the timing message in, adjust for delay, and then create a new master time signal to pass down the network.

What is PTP domain?

A PTP domain is a network (or a portion of a network) within which PTP operates, i.e., a network within which all of the clocks are in sync.

What is PTP date?

The Precision Time Protocol (PTP) is a protocol used to synchronize clocks throughout a computer network. On a local area network, it achieves clock accuracy in the sub-microsecond range, making it suitable for measurement and control systems.

How does a boundary clock work?

How do IEEE 1588 Boundary Clocks work? An IEEE 1588 Boundary Clock serves as a time transfer standard between the subnets defined by the router or other network device. The router or other device must be configured to block all IEEE 1588 messages. The boundary clock has a network connection to each of the subnets.

Does PTP require special hardware?

NTP requires no hardware provisions to capture timestamps other than a typical Unix timer interrupt or counter/timer motherboard chip. PTP normally includes hardware provisions in the servers, clients and switches to capture timestamps upon the passage of an Ethernet frame at the physical layer.

What is PTP priority?

PTP priority is one of the values advertised in PTP announce messages to determine the best master in a domain as per the BMCA process defined in the IEEE-1588 standard.

What is PTP multicast?

Multicast and unicast PTP transport—In the multicast transport mode, PTP uses multicast destination IP address 224.0. 1.129 as per IEEE 1588 standards for communication between devices. For the source IP address, it uses the user configurable global IP address under the PTP domain.

How does PTP protocol work?

PTP works by using a two-way exchange of timing messages, known as “event messages”. It is easy to calculate a “round trip delay” from this, and the protocol then estimates the one-way message delay by simply halving the round-trip delay.

What is IEEE 1588 PTP?

IEEE 1588 PTP is designed to provide time transfer on a standard Ethernet network with a synchronization accuracy at a sub-microsecond level. By leveraging hardware time stamping and PTP-aware network devices such as boundary clocks, achieving synchronization accuracy in the sub-100-nanosecond range is possible. 2 IEEE 1588 Fundamentals

How does the 1588 protocol work?

When the 1588 packet arrives at its targeted ordinary clock the 1588 protocol calls for the clock to extract the contents of the correction field and subtract the correction field value from the computed flight time derived by the difference in time base value between the “master” and ordinary clocks time bases.

How does a PTP subnet work with NTP?

In such a design the PTP subnet would operate in the normal manner with the same NTP daemon interface as a GPS reference clock. In effect, this would be a protocol translator mapping PTP to NTP.

What is a PTP grandmaster?

PTP is capable of synchronizing multiple clocks to better than 100 nanoseconds on a network specifically designed for IEEE-1588. A Network Time Server with PTP is typically referred to as an “IEEE-1588 Grandmaster” or “PTP Grandmaster”.