SyncServer S350

*Product to be Manufactured Discontinued in Q1 2017 and Replaced by SyncServer S600 and SyncServer S650

Ultra Precise & Versatile GPS Network Time Server – Part Number: 1520R-S350

Versatile network time servers are often needed to meet the requirements for demanding, high performance network time synchronization as well as supply traditional time and frequency technology. The SyncServer® S350™ provides unsurpassed NTP performance for the IT network while being the most versatile time server in the world for traditional time and frequency applications.


When it comes to synchronizing the time on servers and workstations for large or expanding IT enterprises the S350 sets new standards for security, accuracy, reliability, redundancy and versatility in network time servers.

Multiple and Versatile Timing Configurations

The Stratum 1 S350 will automatically synchronize to GPS, IRIG, 1PPS, and 10 MHz sources. Users set the priority for smooth transition from one reference to the next if highest priority signal is lost or regained. Time code inputs/outputs include IRIG A/B/E/G/NASA36/XR3/2137 in AM and DCLS formats. An optional AM radio is available to synchronize to national time broadcasts, which can be an alternative to GPS when GPS is not viable option.

Unmatched High Performance with Unparalleled Flexibility and Security

The S350 has four dedicated and isolated Ethernet ports, one of which is Gigabit Ethernet – more than enough to meet the need of servicing thousands of NTP requests per second while maintaining microsecond caliber timestamp accuracy. Multiple ports provide the flexibility to adapt to different network topologies as networks grow and change. It supports a wide range of network protocols including IPv4 and IPv6, for easy management and seamless integration into your existing and future network. An optional upgrade to IEEE 1588 PTP grandmaster operations with hardware based, nanosecond accurate time stamping is available.

Enhanced Security – Secure and Easy Network Integration and Management

The S350 provides very reliable and secure network synchronization technology by combining multi-port network interfaces with multiple time reference technology and enhanced security protocols. TACACS+, RADIUS, SSL, Autokey, MD5, passwords, access control lists and more are standard for maximum security. All of the expected network management and monitoring protocols are standard in the S350.

Easy To Set Up and Maintain

SyncServers are the easiest to set up and maintain network time servers in the world. The front panel of the SyncServer S350 is designed to quickly bring the server online with a few front panel keystrokes or DHCP. To fully configure the unit, use the very intuitive web interface or the step-by-step wizards for the most common operations.

Assured Perfect Timing

The Stratum 1 level S350 derives extremely accurate time directly from the atomic clocks aboard the GPS satellite system. Reliability is further enhanced via Stratum 2 operation by retrieving time from other user-designated time servers. All SyncServers can be upgraded to an internal Rubidium atomic oscillator to keep the time server accurate if the GPS signal is lost.

Alarm Relays for Monitoring Systems

Aside from extensive software based alarms, the hardware based alarm of the S350 relays further enhance Alarming choices.

Customer Tested Time Server Design

The 5th generation Symmetricom SyncServer S350 has decades of design experience behind it. Customer input is evident in every detail. From the front and rear panel design configurations to the state-of-the art web interface, the S350 is unsurpassed in reliability, accuracy, security and ease of use.

Upgrade to IEEE 1588 / PTP

All S350 SyncServers are IEEE 1588 / PTP grandmaster ready with built in hardware based, nanosecond caliber time stamping. An optional key code enables the PTP operations on the LAN2 port. In addition, the S350 can measure the time accuracy of hardware based PTP slaves on the network. Order your S350 with the PTP option or upgrade later when you are ready to deploy PTP on your network.

Bottom Line

The SyncServer S350 is the perfect solution for companies that demand ultra precise time and frequency to maximize the performance of their large and expanding networks.

  • High-Bandwidth NTP Time Server
  • Stratum 1 Operation Via GPS Satellites
  • Gigabit Ethernet port plus 3 additional Independent 10/100Base-T Ports
  • Internal Dial-up Modem for Time Reference Redundancy
  • Stratum 2 Operation via NTP Servers
  • TACACS+, RADIUS, NTPv4 Autokey, MD5 authentication
  • Secure Web-Based Management
  • SSH, SSL, SCP, SNMP, Custom MIB, HTTPS, Telnet, and More
  • Independent Time References: GPS, Timecodes; 1PPS, 10 MHz
  • Versatile Timing Outputs: IRIG A/B/E/G/NASA36/XR3/2137 AM or DCLS; 1PPS, 10 MHz, Sysplex
  • High-Resolution Vacuum Fluorescent Display
  • Full Numeric Keypad
  • IPv6 and IPv4 Compatible
  • Nanosecond Time Accuracy to UTC
  • Alarm Relays
  • Rubidium & OCXO Oscillator Upgrades
  • Upgrade to radio broadcast time sync
  • IEEE 1588 / PTP Grandmaster Option
  • Time Interval Measurement (included with PTP option)
  • All features of the SyncServer S300
  • SyncServer 350 (1520R-3250)
  • SyncServer 350 with OCXO Oscillator (1520R-S350-OCXO)
  • SyncServer 350 with Rubidium Oscillator (1520R-S350-RB)

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