RE: 1PPS synchronization interface text

[patrick diamond <pdseeker@xxxxxxx>]

Hi Kevin

This 1pps test is a great idea to align the "time to present" component across all the RoE end points. One difficulty this 1pps testing provides is a result of the desperate locations so comparing one against the other for alignment precision is difficult. In other systems with this alignment requirement need is to use a GPS to compare the locally generated 1pps with the GPS computed 1pps. This value is logged and compared to determine the veracity of the locally generated signal.

Great suggestion.

Regards,

Pat

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From: kevin.bross@xxxxxxxxx
To: stds-1904-3-tf@xxxxxxxx
CC: jouni.korhonen@xxxxxxxxxxxx
Subject: 1PPS synchronization interface text
Date: Tue, 5 Apr 2016 16:33:20 +0000

All,

 

We’ve talked at various times about wanting to be able to measure the synchronization accuracy of RoE equipment.  The 1PPS output signal is commonly used in telecom and test equipment; even some standard Ethernet switches with 1588 support have 1PPS outputs.

 

I think it would be good for the RoE spec to either encourage or require RoE equipment to provide the 1PPS output.  Here is some proposed text to consider:

RoE equipment should/shall provide a 1PPS output as described in clause A.1.3 and clause A.2 of ITU-T G.8271/Y.1366.

 

Clause A.1.3 talks about the timing of the 1PPS coinciding with the transition to a new second, and clause A.2 describes the 50-ohm 1PPS signal.

 

Feedback?

--kb

 

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Kevin Bross                         Modular Systems Architect
2111 NE 25th Ave, M/S: JF3-466      Phone: 503-696-1411
Hillsboro, OR  97124                mailto:kevin.bross@xxxxxxxxx
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