Symmetricom S350 Rubidium UPGRADED GPS SyncServer NTP Network Time Server Rb [Refurbished]
( 363391650872) )
Tested/Guaranteed • Fully Working
• Brand New iLotus GPS Receiver
Installed • GPS Rubidium NTP
Server (1520R-S350-RB) • Latest Firmware • IPv6 Ready
Photos show the actual item for sale
Here's a used, fully working SyncServer S350 NTP server that obtains highly accurate and traceable time from the GPS satellite constellation. The OEM GPS receiver in this unit has been replaced with an updated module (see next paragraph) for solid service for many years to come. The unit is in good cosmetic condition and while the VFD display shows some signs of prior use, the output is bright and very legible. This unit does have the upgraded Rubidium oscillator installed. The oscillator is the later SA.22c type. This unit does not have the PTP function enabled. The photos show the actual item for sale. The screen shots below were taken during the testing of the unit and show that it works as it should. No accessories other than the rack ears are included however I have them available separately if they are needed. The firmware is updated to version v2.83.2 which is the latest version available at the time of listing. The listing comprises the items you see in the images only. To receive time from the GPS satellite constellation you will need a Symmetricom 12V antenna (listed separately) which will require a full view of the sky.
Full details may be obtained from
the User Manual
Why Swap Out The GPS Receiver?
This unit has been upgraded with a new, latest generation GPS receiver module from iLotus, one of two companies still making cards of the type that this machine uses. Why is that relevant (and maybe worth paying a little more for)? Pretty much all GPS clocks are by design going to fail at a future date. The problem is that the GPS system does not send out a date, but a week number. And in the GPS system there was only capacity in the original design to have a calendar of 1024 weeks (ie. a bit less than 20 years). At the end of the 1024 week period, the calendar goes back to the beginning again and many clocks start showing dates that are 1024 weeks in the past. In a system originally designed for the military this wasn't considered to be a problem, as the Cold War was at its peak and it was unlikely that any military equipment would have a service life of 19+ years. But now in the civilian world this week number 'roll-over' causes problems as each GPS receiver at some point will report a date that's in the past. Not ideal for a precision time server.
Is this an issue for a purchaser of a S350 SyncServer? If you're looking for a stop-gap solution to tide you by for eighteen months until corporate agrees your budget request for a new new box then maybe not. But if your time horizon is more than that then you'll need to consider your options. Will Symmetricom/MicroSemi/MicroChip release a firmware fix? Very unlikely. Even if there's a development engineer still on the same project after 15+ years (and multiple corporate acquisitions) somewhere, sitting in a cubicle surrounded by 20 year old test gear and documentation, Symmetricom is not going to task them to extend the service life of this device. They'd much rather you bought a new state of the art device from them, of course. I suggest that it's a reasonable approach to do a planned hardware upgrade now at very modest cost rather than just leave the problem out in the field and praying that someone else gets the "WTF just happened" call when the old GPS card's firmware decides it's time to travel back in time to 2002.
Ultra Precise & Versatile GPS Network Time Server (NTP)
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.
- High-Bandwidth NTP Time Server
- Stratum 1 Operation Via GPS Satellites
- 4 Independent NTP 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
- Radio broadcast time sync
- IEEE 1588 / PTP Grandmaster Option [not installed]
- Time Interval Measurement (included with PTP option [not installed])
- All features of the SyncServer S300
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 Microsemi 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 [not installed] 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.
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.