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

[Poul-Henning Kamp]

In message <9jq7p2l25jd82kje4sma6ubfsfk5njcbc6 at 4ax.com>, Rex writes:

>I agree. The more I learn about the system, the odder it seems. Before
>looking at the RB, I would have guessed that the XO unit, with GPS,
>would have been disciplining the Rb to use in hold-over. In the RB, I
>don't see any signs of a connection to the C-field control and no
>identifiable DAC, so I assume the RB runs standalone, with only the
>factory alignment of the Rb. I didn't see anyway to get to the
>adjustment for C-field on the LPRO without dismantling the whole box
>either.

The telecom "stratum-2" definition is defined to match a free-running
Rb. (S1 = Cs, S3 = OCXO)

Remember that for CDMA and telecoms in general, the phase is not
relevant, only the frequency stability which has different short
and long term requirements (Eyepatterns, vs. jitter-propagation).

I don't know what stratum level CDMA base stations require, but
S2 is not unlikely.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.