Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

RE: why 20ppm tolerance for ref. clk ?

Due to a failure in the email delivery transport this message was held up.
It is now being forwarded to you.
-----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
needs to have a tolerance of + or - 20 ppm to meet SONET output frequency
Can any one of you please explain how this figure is attained.
thanks in advance,
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>