[time-nuts] Efratom FRS 10mhz rubidium frequency oscillator+ board
wje at quackers.net
Mon Jun 1 01:23:10 UTC 2009
This is a pull from a Lucent unit used to provide timing for cell sites.
I have a couple myself.
The board is primarily a 10Mhz to 15Mhz converter. It also has some
failover logic. Typically two independent units were installed in one
The D connector has power in and status in, and provides status out. One
unit is set as the primary and the other as the secondary via signals on
the connector. The secondary then monitors the status of the primary and
will switch to primary if the other fails.
The TNC connectors provide raw 10Mhz from the FRS, a buffered 10Mhz, and
I did at one time have the connector pinout info, but since the board is
fairly useless, I'm not sure I kept it. It does have some nice TNC
connectors and a nice crystal filter, if you happen to need a 15Mhz filter.
They said 'Windows or better'
so I used Linux.
GandalfG8 at aol.com wrote:
> Bob, Fluke.1, is selling these on Ebay, for example item # 290313671907,
> and supplies the FRS module itself with an interface board containing the
> FRS connector, plus another PCB containing a 15MHz oscillator and assorted
> other parts that the FRS interface board plugs into.
> Connecting up the FRS itself via the 10 way header on the interface board
> is simple enough, most connections are marked and others easily traced, but
> there's no information available regarding the other PCB.
> Does anyone have any information regarding the purpose of this board
> and/or connection details for the fitted 25 way D type and TNC connectors?
> Any information on the functions of the various jumper pins would also be
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