my old TymServe 2100-GPS seems to have died. would appreciate reccos
for a replacement. it is in a stand-alone environment so i can avoid
roof access issues. antenna already in place. thanks.
randy
FreeBSD, Trimble Thunderbolt and a TAPR FatPPS?
-Steve
I've only used their CDMA-based time server, which is handy here in the
States when line-of-sight access is difficult, but EndRun Technologies
makes something you might want to consider:
<http://www.endruntechnologies.com/time-servers.htm>
Just be aware that you may want to harden the system a bit based on
what I saw from the last shipping defaults. A template for the CDMA
version is here, but I suspect the GPS version would be hardened in a
similar fashion:
<http://www.team-cymru.org/ReadingRoom/Templates/secure-endrun-template.html>
John
Thing with the Thunderbolts is not all revisions of the
firmware seem to play nice with ntpd. And yes, the PPS is quite
narrow and would have to be conditioned as well.
I think I'd start somewhere else unless you also needed
the frequency reference.
Good news is, the 2100-GPS used a 5-12VDC antenna with
no downconversion, so it should work with just about anything.
Randy, what's your budget for this? ($$$$ and space)
Does it have to be 1U, or is a 1U GPS receiver and 1U time
server acceptable?
--msa
Randy,
Ublox LEA-7T's are either out, or will be out shortly in the Evaluation Kit product. Stick your antenna on that, and it provides a very solid 1PPS to NTPd. Should be less than $300 shipped.
Andrew
I would definitely second this - I have one of these from ages ago and it runs great, and the CDMA sourced data means just throwing an antenna at the top of the cabinet in the datacenter vs running antenna cabling onto the roof for a GPS antenna. I believe I got mine on the secondary market for a fraction of the cost you mentioned Randy.
I did have an issue in 2004 with a Verizon base station having a leap second setting off or something like that, but after reporting it to EndRun they contacted Verizon and had them update it and I don't think I've touched it since.
Nikos
my experience with cdma was kinda funky
and there already is a fancy gps antenna
randy
i've been using a earlier version of this:
Le 26/06/2012 19:30, Randy Bush a �crit :
my old TymServe 2100-GPS seems to have died. would appreciate reccos
for a replacement. it is in a stand-alone environment so i can avoid
roof access issues. antenna already in place. thanks.randy
If you're looking for somthing fancy, you may want to check out
http://www.timeservers.eu/Products/Time-Server-NTS4000
Multiple sync source (GPS, Glonass, Gallileo, GSM, input for rubidium or
cesium clocks, 1PPS straight input for analog radio sync), compact form
factor, dual (up to 6) LAN port for redundancy... This device does it all 
several models and options are available, ranging from $3k to $8k AFAIK.