Symmetricom SyncServer 1520R-S250 UPGRADED GPS NTP Network Time Server IRIG-B [Refurbished]
( 283886099654) )
Tested/Guaranteed • Brand New iLotus GPS Receiver Installed • Good Condition • Fully Working • IRIG-B, 10MHz and 1PPS Inputs/Outputs • Firmware v1.36 • IPv6 Ready • TCXO
Photos show the actual item for sale
Introduction (Important to Read)
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 S250 SyncServer? If you're looking for a stop-gap solution to tide you by for a couple of years 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.
Back to the Description
Here's a used Symmetricom SyncServer S250 NTP server that obtains highly accurate and traceable time from the GPS satellite constellation - as well as IRIG-B, 10MHz and 1PPS inputs if preferred. The unit has been tested (screenshots below) and confirmed to work fully. The cosmetic condition is very good - the photos show the actual item for sale. No antenna is included but I have the matched 12V AT575 antenna available in a separate listing, and/or can edit the listing to include one if required. Note that the antenna voltage is 12V so you cannot use one of the generic 5V antennas commonly offered for sale. The antenna needs to be mounted outside with a complete view of the sky. It ships set to the factory logon defaults (admin:symmetricom) ready for your install. This unit has the TCXO internal oscillator. The installed firmware is v1.36 which is the latest version available at the time of listing. Listing comprises the items you see in the images only.
Usually Sells for $5,353
The SyncServer S250 provides multiple and versatile timing configurations that support the expanding technological requirements of large enterprises. It is Next Generation ready to be the synchronization source for multiple applications
Multiple and Versatile Timing Configurations
Easy To Set Up and Maintain
Highly Robust and Secure
Flexibility and Performance
Assured Perfect Timing
Customer Tested Time Server Design