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EndRun Sonoma PTP/IEEE-1588 Grandmaster

GPS or CDMA-Synchronised, Dual Gigabit Ports


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The Sonoma Precision Time Protocol (PTP) Grandmaster Clock delivers the level of performance that is required in high-speed, low-latency systems.
Availability: In stock

For details on how to purchase the EndRun Sonoma PTP/IEEE-1588 Grandmaster, please click the button below to send us your details and brief requirements. We can then quote you accordingly.


Sonoma PTP Grandmaster

The Sonoma Precision Time Protocol (PTP) Grandmaster Clock delivers the level of performance that is required in high-speed, low-latency systems. EndRun makes it easy to add the optional PTP/IEEE-1588 protocol to one or both of the dual gigabit ports on the Sonoma Time Server. The Sonoma is a 3rd generation Network Time Server and 2nd generation PTP Grandmaster and is a perfect choice for PTP or mixed PTP/NTP networks. The highly-integrated solid-state design is very reliabl, and you can easily mange it via one of the network ports or the RS-232 serial port. A Web Interface (HTTPS) is also providezd for status monitoring using your Internet browser.

Dual Gigabit Ports

The Sonoma has two 10/100/1000 Base-T Ethernet ports. The PTP protocol can be enabled on one or both of these ports. Using both ports enables one Grandmaster to service two indpendent PTP subdomains.

Hardware Timestamping

Each Sonoma is shipped from the factory ready for hardware-based PTP timestamping on both gigabit ports. You can purchase the PTP/IEEE-1588 option on one or both of these ports. Hardware timestamping provides the kind of accuracy and performance that is required for today's low-latency systems.

Easy PTP Configuration

You can easily configure all PTP parameters via the network console port, serial port or the front-panel keypad/display. PTP configuration can be viewed by these methods and also via the Sonoma built-in Web Interface. Once the PTP Grandmaster configuration is saved, it is broadcast to all PTP slaves who then configure themselves accordingly. If more than one Sonoma is installed on your network, the best PTP Best Master Clock (BMC) algorithm automatically decides which one becomes the Grandmaster.

Oscillator Options for Improved Timestamp Accuracy if Signal Lost

The Sonoma can be configured with an oscillator option that offers improved timestamping accuracy in the casae of GPS or CDMA signal loss. The drift rate of the oscillator is what causes the Grandmaster to gradually move away from "perfect time" if the reference signal is lost. The slower the drift rate of the oscillator, then the more accurate your PTP timestamps will be during periods of signal loss.

The basic Sonoma is provided with a TCXO (drift is 10 milliseconds for the first day). This is the best performance for any time server on the market with a TCXO. For even better performance you may want to consider an oscillator upgrade. Drift rate of EndRun's propietary OCXO is 80 microseconds for the first day, and the drift rate of the Rubidium is 5 microseconds for the first day. Specifications for the oscillator options are shown below. For PTP purposes, the most important specification is the accumulated time error for the 1st day after signal loss.

Manufacturer EndRun
Part No. Sonoma-PTP-GM
End of Life? No
Synchronisation Accuracy GPS Receiver Accuracy - < 30 nanoseconds RMS to UTC(USNO) when locked
CDMA Receiver Accuracy - < 10 microseconds to UTC(USNO) when locked, typical
A hardware-based PTP Slave can synchronize to within 100 nanoseconds of the Grandmaster using a crossover cable or PTP-enabled switch
A software-only PTP Slave can synchronize to the master to within 10 microseconds typically
Time/Frequency Output PTP/IEEE-1588-2008 (Version 2)
Default profile
Two-step clock
Timing Protocols PTP
NTP v2, v3, v4, SNTP, MD5 authentication, broadcast/multicast mode, and autokey
SSH client/server with “secure copy” utility, SCP
SNMP v1, v2c, v3 with Enterprise MIB
TTPS (Web Interface)
TIME and DAYTIME server
TELNET client/server
FTP and DHCP clients
Network Ports Two rear-panel RJ-45 jacks
Two 10/100/1000 Base-T Ethernet
Receivers GPS or CDMA Receiver
Oscillator TCXO, OCXO or Rubidium