As anyone with a Nortel GPSTM knows, it's a close cousin to the Thunderbolt but
not exactly identical. Notably, coming from a CDMA environment, the unit has an
"even second" output, aka PP2S, aka 0.5pps, aka 0.5Hz, etc. (Hoping to make
this searchable...) There are software commands to configure this on the
Thunderbolt too, but the GPSTM appears to have this function hard-coded into
the PAL, and it can't be set back to PPS in software.
However, there exists a PPS signal on the PCB, at TP13 between the Trimble chip
and the PAL, discovered by some folks at the hackerspace here, during some
noodling-around with an oscilloscope this afternoon. It's all documented here:
https://www.i3detroit.org/wiki/Nortel_GPSTM
This is for a NTBW50AA-11 module (single long board), other parts may have the
signal in different places but I bet it's in there.
Enjoy!-Nate B-
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