Subject: [ntpwg] NTP vs. PTP (was: Documents, slides, etc. from WG meeting)

From: antti.pietilainen at nsn.com (antti.pietilainen at nsn.com)
Date: Wed, 24 Oct 2007 17:59:27 +0300

Hi Martin,

Thank you for the excellent comparison between PTP and NTP. A very minor
comment below. 

[Martin]
>3.) Once the special hardware support for PTP is not available, PTP 
>suffers from the same limitations as NTP, i.e.
>the unknown latencies mentioned above. 
>Under these conditions NTP can even yield better results due to the 
>statistical methods it uses.
>

[Antti]
If the same algorithm is used in PTP as in NTP in case 3) above, both
will yield same results. The PTP implementations designed for telecom
networks use proprietary statistical methods.   

Best regards, Antti

Antti Pietilainen
Nokia Siemens Networks
P.O. Box 6
02022 NOKIA SIEMENS NETWORKS
Finland
Visiting address:
Linnoitustie 6
02600 ESPOO
Finland
tel. +358-71-8036660
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