Sonoma D22 and N22 are fourth-generation NTP Servers that provide an accurate, reliable and secure source of network time inside your firewall or air-gapped network. These enterprise grade, purpose built appliances support hundreds of thousands of Network Time Protocol (NTP) or Simple Network Time Protocol (SNTP) clients. Sonoma is supported with a money-back guarantee, a three-year warranty and free technical support for life.

• Two 10/100/1000 Base-T Ethernet ports.
• GPS Receiver Accuracy: < 25 nanoseconds RMS to UTC(USNO) when locked.  Optional 10 nanosecond calibration is available.
• > 50,000 NTP packets/second with < 10 microsecond NTP timestamp accuracy.
• Supports hundreds of thousands of network clients.
• View and correlate data plots with NTP, CPU and Oscillator statistics.
• IPv4 and IPv6 compliant.
• NTP, SNTP, HTTPS (Web Interface), SNMP, SSH, SHA-1/256, MD5, DHCP and more.
• TACACS+, RADIUS, LDAP secure access authentication.
• User-friendly display & keypad with built-in help messages (Sonoma D22).
• Free technical support for life.
• Your Satisfaction is Guaranteed.
• Options: Oscillator Upgrades, Dual Power Supplies, IRIG-B Timecode, 1PPS, Pulse Rates, 10 nanosecond calibration, alarm, DC Power Supply (125/48/24/12 VDC), Serial Time/Sysplex Timer, and PTP Grandmaster (future release).

Easy to Install and Maintain

Network installation is done in just a few minutes using DHCP or, with Sonoma D22, you can configure the unit with a few simple keystrokes on the front-panel keypad/display. TACACS+, RADIUS, and LDAP simplify provisioning with centralized user access management. Monitoring, maintenance and control are easily and securely accomplished via SNMP v3 and SSH and other protocols.

Network-Security Hardened

Extra care has been taken with the Sonoma to "harden" it against network attacks. There are only a small handful of settings that need to be made and they typically need to be set only once in the lifetime of the product. Since this is a true set-it-and-forget-it box, we have eliminated all extraneous protocols/services in order to minimize exposure to security holes.  You can change critical settings over the network using SSH and monitor the alarm/status information by using HTTPS, SNMP, and SSH. Security-conscious users can disable any of the risky protocols or restrict access to specific hosts.  For the highest security level, the USB console interface can be used for management while all other protocols are disabled except for NTP.

Web Interface

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Sonoma Sample Web Page

 

A wealth of information is available via the Sonoma Web Interface:

• Monitor status.
• View configuration.
• Easily upgrade firmware.
• View and correlate data plots with NTP, CPU and Oscillator statistics.
• Note the Web Interface (HTTPS) is disabled by default to reduce the network attack surface but can be easily enabled for temporary or full-time usage.

Data Plots

While providing precise time to the network, the Sonoma is saving status information not only to the typical log files (Syslog), it also stores daily and weekly status plot files for the CPU, NTP and Oscillator. All of the plot files are available via the Web Interface and can be downloaded from the server as .png files to verify historical performance and forensics.

Extended Stratum 1 Operation if Signal Lost

If your GPS signal is lost (e.g. compromised antenna, cable, or disrupted signal), Sonoma will continue to serve Stratum 1 time (accurate to 10 milliseconds to UTC) via NTP for awhile. This is called the holdover period and is dependent upon the quality of the reference oscillator and the quality of the software control algorithms. Click here to see some reasons for signal loss.

The base-level Sonoma is provided with a TCXO oscillator that, upon signal loss, will drift away from perfect time by 10 milliseconds during the first day resulting in a holdover period of 24 hours.  For better holdover performance you may want to consider an oscillator upgrade. Oscillator drift rates and Stratum 1 holdover periods are listed below:

Best Window-Mount Antenna Performance

If a rooftop antenna is difficult for you, then mounting your GPS antenna in a window may be an option. Indoor installation is dependent upon the view of the sky to the satellites and a window that does not have metallic coatings.  We recommend the Premium OCXO or Rubidium oscillators for window-mount antenna installations as intermittent signal reception is not unusual.  With the holdover performance of the upgraded oscillators, your antenna needs to lock to the GPS signal only once a month in order to continue serving accurate Stratum 1 time to your network.  Click here to read about window-mount antenna installations.