[time-nuts] FW: IEEE 1588

Daun Yeagley daun at yeagley.net
Wed May 3 09:36:20 EDT 2006

Is that license fee to HP or to Agilent?


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf
Of Poul-Henning Kamp
Sent: Wednesday, May 03, 2006 1:14 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FW: IEEE 1588

In message <001901c66e61$bbd4db10$7f01000a at fakie>, "Christopher Hoover" writes:
>Has anyone been following the recently issued IEEE 1588 Precise Time 
>Protocol (PTP) standard?

Yes, I have.

There's a $1000 license fee to HP for patents before you can start to play with
it and no waiver is possible, so Open Source not an option.

>>From what I've read, implementations have demonstrated 10-100 
>synchronization between computers connected via Ethernet.

Provided you have hardware support in the ethernet controller.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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