Selenio™ Network Processor
User Guide
Installation
© 2019 Imagine Communications Corp.
Proprietary and Confidential.
May 2019 | Page 26
Connecting to a PTP Source
To connect to a Precision Time Protocol (PTP) IEEE-1588 source, note the following:
The 1588 standard assumes symmetrical path delay. If you have different rate paths (E.g. VSG-4MTG at
100Mbps and SNP at 10G), the One Way Delay (OWD) calculation is incorrect. Two parameters allow
SNP to compensate for this error:
Network from master/boundary clock
and
OWD Offset
, listed in
PTP
(on page 54).
To configure these parameters, follow these steps in SNP Manager:
1.
From the main menu, choose
Tools
>
Configure Element.
2.
Select the
Reference
tab, and under
PTP
>
Configuration
, select the
Network from
Master/Boundary Clock
option that best describes your network configuration.
This parameter makes an OWD calculation based on an assumption of how the switch behaves
internally. Not all switches will always behave this way.
3.
Using a PTP master with a 2059-1 aligned black output, measure the relative timing (in
microseconds) of the SNP SDI output to the PTP master’s black output.
E.g. WFM8300.
4.
Enter this value in the
OWD Offset
control, which is also found under
Configure Element
>
Reference
>
PTP
>
Configuration
.
Initial Setup
The SNP ships with a default IP address, gateway, and subnet mask. You should change these settings so
they are appropriate to your network.
