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Does anyone know what the clock tolerance is on routers etc. for 1 Gigabit Ethernet and where can I find it on the internet. I'm referring to the reference clock that runs at 156.25MHz. It should be +/- some PPM. I'm looking to find out what that something is. I'm building a piece of equipment that links to routers and I need to know what the pull-in range needs to be to accomidate all routers. This is 1 GbE, not 10 GbE. Thank you in advance.

2006-08-28 12:17:59 · 1 answers · asked by TaxMan 5 in Computers & Internet Computer Networking

This is a PHY interface over fiber. Thank you for asking me to clarify, and sorry I didn't originally.

2006-08-29 02:42:19 · update #1

1 answers

Are you designing a PHY or a MAC interface ? Is it fiber or CAT5 ?

If you are designing the fiber PHY interface, you should be able to find the jitter spec's on the 802.3z specificaion. By that you should be able to determine your reference clock ppm. In the spec, one should be able to find the jitter spec's at different TP.
You should be using the electrical jitter spec's and not the optical jitter as your base line.

You can actually pull you clock, I am guessing you are using some sort of VCXO or VCO for your reference clock.

!nteresting.

2006-08-28 12:49:21 · answer #1 · answered by Just_curious 4 · 0 0

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