when to set E1 PRI clock source?

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Jun 14th, 2008
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hi all,

does any one know based one what i set the clock source to external or internal?. actually im connecting to Voice provider with E1 Line. should i ask the provider if they are the clock source? and if yes they provide the clock , then under the vwic should i use command clock source Line/internal??.

i appreciate if any experts could explain to me this paramter

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Chris Deren Sun, 06/15/2008 - 04:49
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You should always clock of off telco equipment, leave the controller in default "line". Use network-clock-select command to specify clock preference.



t-alkhalidi Sun, 06/15/2008 - 09:39
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thanks for the info below. so most of telco is clock source master?, so when i specifiy line in the gateway and external in call manager thats mean the router is slave for the clock and master or source of the clock is telco. ok when i make it internal it means the clock source is the router incase the telco not providing clock, im right?


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