Symmetricom XLi UPGRADED GPS 10MHz TCXO Oscillator NTP Server w/ PPO TIET Freq [Refurbished]
( 234404105504) )
Tested/Guaranteed • Upgraded
iLotus GPS Module • TCXO Oscillator • NTP Server • PPO •
TI/ET • Frequency Measurement • GPSDO 10 MHz Oscillator •
1PPS • IRIG-B • Part Number 1510-602
Here's a lightly used, late model (early 2016, Microsemi logo) Symmetricom XLi Time/Frequency unit in very good cosmetic condition. The unit has been tested and confirmed to operate as it should. This unit does have the internal GPS receiver card (87-8028-2) installed which supplies 12 volts to the antenna, so the use of a matched Symmetricom AT575 12V antenna is recommended. This unit has been upgraded with a new, latest generation GPS receiver module from iLotus so that you won't need to worry about the date being incorrect for years to come (see remarks below). The internal 10MHz oscillator is the standard TCXO type. The firmware has been upgraded to the latest version posted on the Symmetricom website (v2.4), and this supports reporting and configuration via a web interface. The unit does have the optional software based functions activated: NTP server, Time Interval/Event Timer (TIET), Frequency Measurement, Programmable Pulse Output. Rack ears are provided as shown. In my testing I was able to achieve lock to GPS time and screenshots of the results of my testing are provided below.
Full details may be obtained from
the User Manual
Replace the GPS
This unit has been upgraded with a new, latest generation GPS receiver module from iLotus. 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. The OEM Furuno GPS modules supplied in stock XLi units are going to experience this "week number roll over" in September 2022 so 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 card's firmware decides it's time to travel back in time to 2002.
- Better Than 1x10-12 Frequency Accuracy
- Supports Primary and Secondary Reference Inputs (GPS, Time Code, 1PPS)
- Configurable as Dual Redundant GPS Receiver in One Chassis (second GPS option not included)
- Standard 10/100 Base-T Network Port
- Intuitive Web Based Management
- HTML, Telnet, SNMP with MIB Standard
- Vacuum Fluorescent Display and Keypad
- Completely Modular with Plug-and Play Capability
- Numerous Field-Upgradeable, Plug-in Option Cards Available
- Time code reader/generator (IRIG A,B; NASA 36) AM and DC
- Auxiliary Reference Input Supports Lock to External Cesium to Enhance Holdover
- Standard Outputs: 1PPS, Selectable Pulse Rates and Alarm
- Flash Memory for Remote Software Upgrades
One of the great design benefits of the XLi is that, because of its variety of option cards, a company can customize it to fit to their specific application needs. Whether your application demands redundancy in power supplies, GPS, or any other function, all it takes is the proper configuration of cards.
XLi Option Cards The wide range of XLi option cards make it easy to tailor your system to support nearly every possible output/input needed for time and frequency applications, by combining option modules, oscillator upgrades, and two GPS receivers per unit. Plug-and-play cards and built-in XLi option card recognition software lets you swap out modules without modifying your operating system.
Plug and Play Configuration Configuration recognition software automatically detects the unit’s setup, without modifications to the operating system, providing “plug-and-play" configuration capability for current and future application needs.
Freedom to Configure Modularity delivers the freedom to configure the XLi as a GPS timing receiver [GPS option not included], or a time code unit (TCU).
Seamless Integration The XLi seamlessly integrates into a network centric environment. The 10/100 Base-T interface is standard. Remote management is facilitated with the intuitive HTML web based interface as well as SNMP with an enterprise MIB. Command line interface is also supported via Telnet or the RS-232/422 serial port. The XLi can function as a Stratum 1 NTP server with addition of the NTS option.
Wide Range The standard XLi provides a wide range of time and frequency inputs and outputs such as: 1PPS output; time code input/output (IRIG A, B; NASA36) in both modulated (AM) and demodulated (DCLS) formats; programmable pulse rates; open collector alarm; front panel keypad and display; and more.
Modular Architecture for Easy Extensions The modular XLi architecture allows easy extension of the software and hardware in the field. Software updates are remotely administered. Existing and future hardware option modules can be added as needed by the user. The GPS timing interface is also modular which facilitates future upgrade to alternate Global Navigation Satellite Systems (GNSS), such as Galileo, when available.