[time-nuts] Lucent RFG-M-RG and XO

John Ackermann N8UR jra at febo.com
Thu Dec 28 13:51:24 UTC 2006


Thanks for the information, Gerald.

Could the fault light without 10MHz input be as simple as the system
reporting failure of the Rb?  i.e., the XO unit working OK, but just
reporting that the system wasn't operating properly.

Like you, I'm having trouble sussing out just why this thing is designed
as it is, which oscillator is primary, and why...

John
----

Gerald Molenkamp said the following on 12/28/2006 06:27 AM:
> Some 5 years ago I recovered one of each, ( RFG-M-RG & RFG-M-XO ) from a Lucent CDMA BSC site here in Australia. Both units were only 12 months old, at that stage inter-connected via the J5 "interface" 10MHz out to 10MHz in from the RG to XO respectively and of course 24 VDC. 
> 
> After some reverse engineering of the BSC, I never understood the reason for the REG-M-XO in the BSC as it required a 10 MHz input from the RG for it to operate properly, e.g. the fault LED off. The 15 MHz signal is the synthesiser reference output that is fed into the BSC radio, synchronisation then propagates through the CDMA network, which I assume is used as one of many Primary Reference clocks ( PRC ) for the network of many BSC's. My assumption is that the XO is used as a back-up PRC in the event of RG failure, or as part of the hold-over system, but this was questionable.




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