Unison GPS Network Time Server
Our Basic GPS Time Server
Provides Accurate and Reliable Network Time Inside Your Firewall

The Unison is a standalone Stratum 1 time server that provides an accurate, reliable and secure source of network time inside your firewall. This model uses GPS as its time-synchronization source and it will deliver accurate time throughout any system running an NTP or SNTP client.

60-Day Money-Back Guarantee

Supports 200,000 network clients with <10 microsecond NTP timestamp accuracy.
Extended Stratum 1 operation if GPS signal is lost.
NTP, SNTP, MD5, SNMP, SSH, SCP, TIME, DAYTIME, TELNET, FTP, DHCP and more.
IPv4 and IPv6 compliant.
Superior reliability - an MTBF of 25 years based on demonstrated field data.
Options: Oscillator Upgrade, Alarm, -48Vdc.

Network Security Hardened
Extra care has been taken with the Unison 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 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 via SSH or Telnet and monitor the alarm/status information by using SSH, Telnet, or SNMP. Security-conscious users can disable any or all of the risky protocols such as Telnet, Time and Daytime or restrict access to SSH, Telnet and SNMP to specific hosts.

High-Performance
The high-bandwidth NTP capability ensures a typical timestamp accuracy of <10 microseconds can be sustained while handling hundreds of NTP requests per second. This means that up to 200,000 NTP clients can be reliably synchronized to within 1/2 to 2 milliseconds of each other.

Extended Stratum 1 Operation if GPS Signal Lost
If your GPS antenna is on the roof the signal can be lost for several reasons, such as lightning strikes and damage due to maintenance activities or vandalism. For window-mount antennas the signal is often missing because of poor sky visibility. The Unison will continue to serve Stratum 1 time for a substantial period if the GPS reference signal is ever lost. This is called the holdover period and it is dependent upon the quality of the oscillator and the quality of the software control algorithms.

The standard Unison is provided with a TCXO. If the GPS signal is lost it will drift away from perfect at the rate of 10 milliseconds during the first day. This is the best holdover performance of any time server on the market with a TCXO. For even better holdover performance you may want to consider an oscillator upgrade. Oscillator drift rates and Stratum 1 holdover periods are listed below:

Oscillator	Drift Rate If No GPS Signal	Stratum 1 Holdover Period
TCXO	10 milliseconds for 1st day	24 hours
OCXO	100 microseconds for 1st day	35 days

Best Window-Mount Antenna Performance
Our GPS time server has the ability to operate in a single-satellite mode. This lets you avoid the trouble and expense of a rooftop installation by allowing you to mount the antenna in a window of your building up to 150 feet away. And with our best-on-the-market holdover performance - your antenna only needs to see one satellite once a day to continue serving accurate Stratum 1 time to your network. Read about our other GPS-synchronized Time Server.

Your Satisfaction Is Guaranteed
The Unison is backed by a full 60-Day Money-Back Guarantee, a 3-Year Parts and Labor Warranty, and free technical support and software upgrades for life.

Call Us
Email or call us for pricing and ordering information between 7:30 am and 4:30 pm Pacific Time at:

1-877-749-3878