I found this post by ccie15672 in 2008..
"There is one PLL on the motherboard, called the network-clock. Modules on your router may participate in this clocking scheme or not. Some have to, because they don't have their own PLLs/clocks on-board. When you need/want a module to participate in the network clock, you use the network-clock-select command. You select the master clock with the network-clock-select command. You can choose multiple master clocks and order them by priority. Only one is active at a time." Assuming my ISR primary clock source is the telco PRI. My question is I have another T1 PRI I am PROVIDING clock too (Clock source Internal), I would never add that T1 to the network-clock-select command. As I am not trying to receive clock from it, but rather send it. The remote side would use network-clock-select to get clocking from my T1. Thanks, Adam
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