HOWTO: Security

[Hal Murray]

esr at thyrsus.com said:
>> OCXOs are big, power hungry, and expensive.  Why do you want one?
> To minimize drift during loss of sat lock, of course.

Do you have any idea how big a can of worms you are opening?

Low end OCXOs will double the cost of Pi type setup.  Good ones cost a lot 
more.

How long do you want to run without satellites?  How much clock drift are you 
willing to tolerate?  What is the temperature range of your environment?

How many are you going to buy?  Do you want a few for hacking where we can 
use eBay parts to trade time for $$, or are you willing to pay for commercial 
parts that will probably meet specs and you can get more of them if you want 
to build another batch?

Who is your target customer?  Why would they buy from you rather than from 
Microsemi?
  http://www.microsemi.com/products/timing-synchronization-systems/time-freque
ncy-distribution/network-appliances-servers/syncserver/syncserver-s600


I repeat my suggestion of designing in a connector for an external clock so 
we can get off the ground and prototype fancy options.

If you are looking at data sheets, you don't need accuracy.  ntpd can correct 
for that.  You want stability.


-- 
These are my opinions.  I hate spam.