Clock Master Other

This page documents the configuration of the Clock Master for the other White Rabbit networks (not 'Production').

Introduction

The Clock Master is the source of clock and time in the Timing System. The following components are involved:

• a White Rabbit Wwitch connected to the 'Production' network
• a WR-ZEN
• a White Rabbit Switch as Grandmaster Clock

Overview

Figure: Linking other White Rabbit networks (blue boxes) to the main 'Production' network (orange boxes). The '10MHz/PPS Generator' (WR-ZEN) is a White Rabbit node connected to the 'Production' network.

Configuration

Cables and Connections

WR-ZEN Output	WRS Input
C	PPS
A	10 MHz

Table: Connection from WR-ZEN to WRS (Clock Master).

WRS 'Clock Master' inputs are directly connected to WR-ZEN outputs. All copper cables are length matched (2m).

One WR-ZEN power supply is connected to standard mains, the other is connected to a UPS.

WR-ZEN Output Config

Output	Value
--	--
--	--
--	--
A FDelay	0 ps
A Mode	10M
AB xPPS Mode	Disabled
AD9516 Phase Alignment	-8 ns
B FDelay	0 ps
B Mode	10M
C FDelay	0 ps
C Mode	PPS
C Term Adapt	1 MOhm
D FDelay	0 ps
D Mode	PPS
D Term Adapt	1 MOhm
LMK Phase Alignment	0 ns
PPS Coarse Offset	-104 ns
PPS Rate	1 PPS
PPS Width	20000000

Table: Configuration of WR-ZEN outputs (status 2019-10-29).

-- DietrichBeck - 29 Oct 2019