[time-nuts] Used ESE ES-911/GPS/NTP Master Time Clock

[Gregory Beat]

Time Nuts —

The ESE ES-911/GPS/NTP unit was specifically designed to meet the National Emergency Number Association (NENA) Standard NENA-04-002 for a Public Safety Answering Point (PSAP) Master Clock.  It traditionally provides “Time Synchronizing” all components of a PSAP.
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Used (surplus) ES-911/GPS/NTP units have appeared on eBay from an east coast reseller.  These units were likely surplussed, due to 1024 week rollover issues (GPS).  
NTP and PSAP usage (911 centers) require an accurate date.

Two nice photos (on auction page) show inside of the rack cabinet.
Some Highlights:

* This ES-911/GPS/NTP model was replaced by ES-911E (new features, components) by the “ES-911E” production model.  Newer model has disciplined 10 MHz option (K-option).

* Rack mount enclosure.  Plenty of Room for a DIY addition.
* Units are powered by 6 Volts AC (coaxial connector, rear panel).
* 12-channel GPS receiver (ESE normally used Motorola M12(+) receivers).
Contact Art Sepin at Synergy for 1024 rollover or multi-GNSS receiver replacement.
https://synergy-gps.com/products/gps/timing-boards-modules/

* 10Base-T port (10 Mbps) for Network Time Protocol (NTP) usage.  
ESE formally use WizNet for that plug-in PCB (current vendor ?).
ES-911 can serve as local time server (NTP) for home network (TCP/IP).

* 6 Volt battery (under aluminum bracket in eBay photos), 
Digi-Key P128-ND, Panasonic LC-R061R3P
Assume the battery is dead and replace with fresh one, $12.84 USD

* Unit has 1 PPS as well as time-code outputs for remote time displays (useful).

ESE ES-911 Product Sheet (copy not downloadable, from ESE web site)
http://a2dcorp.us/pdf/ese/ES-911%2520GPS%2520NTP.pdf

After you have purchased ES-911/GPS/NTP, Contact ESE Support (with product SN).
ESE can provide (via email) the PDF of Product Manual with Schematic diagram and Parts List.  BONUS: Parts are listed for the Options (ESE uses common PCB).

Firmware is password protected (ESE intellectual property) and Flashed/EEPROM in the often Intel MCS-51 (8051) processor.
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Greg, w9gb
Chicago

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