[AusNOG] Reference clock for SDH network

[Adrian Chadd]

Because the temperature drift on your crystal is more than a few parts
per million? And that matters when trying to clock a high bitrate SDH
network? :)



Adrian

On Tue, Oct 27, 2009, Bevan Slattery wrote:
> I'm guessing about the same way a 1 cent plastic bottle and tap water
> sells for $3.50 at your local service station/cafe etc.
>  
> [b]
> 
> 
> ________________________________
> 
> 	From: ausnog-bounces at lists.ausnog.net
> [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Damien Gardner Jnr
> 	Sent: Tuesday, 27 October 2009 12:58 PM
> 	To: ausnog at lists.ausnog.net
> 	Subject: Re: [AusNOG] Reference clock for SDH network
> 	
> 	
> 
> 	On 27/10/2009, at 12:19 PM, Tom Storey wrote:
> 
> 		Hi All,
> 		
> 		Can anyone suggest a clock that is able to produce a
> 2mbit/2mhz sync  
> 		signal to use as a reference for an SDH network?
> 		The network is detatched from any existing SDH networks,
> so I have to  
> 		clock it from scratch.
> 		So far I have only come across one that is around the
> $3k mark  
> 		(Oscilloquartz), and my googlefu is failing me at the
> moment.
> 
> 
> 	I'm obviously missing something here, but how on earth can a
> crystal, a couple of caps and resistors, and maybe a transistor or two
> or an IC work out to the $3k mark??
> 
> 	I'm assuming you're actually looking for something more complex
> than a simple 2mhz clock signal??
> 
> 	Cheers,
> 
> 	DG
> 
> 	
> 	Damien Gardner Jnr
> 	VK2TDG. Dip EE. GradIEAust
> 	rendrag at rendrag.net -  http://www.rendrag.net/
> 	--
> 	We rode on the winds of the rising storm,
> 	 We ran to the sounds of thunder.
> 	We danced among the lightning bolts,
> 	 and tore the world asunder
> 
> 

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