RE: why 20ppm tolerance for ref. clk ?
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-----Original Message-----
From: Krishna Sankar [mailto:krishna.sankar@xxxxxxxxx]
Sent: Tuesday, May 29, 2001 11:48 PM
To: stds-802-3-hssg@xxxxxxxx
Subject: why 20ppm tolerance for ref. clk ?
Hello All,
I have read that, reference clock in Clock Data Recovery Unit used in SONET
systems
needs to have a tolerance of + or - 20 ppm to meet SONET output frequency
specifications.
Can any one of you please explain how this figure is attained.
thanks in advance,
cheers,
krishna
~~~~~~~
Krishna Sankar M
Engineer-VLSI/System Design
Tel : +91-80-8520408 / 8520416 Ext. 4320
Fax : +91-80-8520478
email : krishna.sankar@xxxxxxxxx <mailto:krishna.sankar@xxxxxxxxx>