The interoperability Layer: The devices that belong to this layer are also known as
last-hop devices. Typically, one of these devices is placed per rack cabinet and is in
charge of distributing the ultra-accurate timing provided by the White Rabbit net-
work to other 3rd party devices in the cabinet via PTP, via 10MHz/PPS (legacy
devices), etc.
Note: This reference topology is a simplified version of a real timing net-
work and the proposed structure in layers might not be respected: A last-
hop device could be connected directly to the GM or an external GNSS ref-
erence could be used as backup in the fan-out/interoperability layer.
Note: Some devices in the reference topology strategically include the hold-
over option (HO) to ensure continuous operation even if not locked to any
timing sources. This option is automatically enabled if detected and the
provided presets can be used without any modifications.
5.2.3 Timing source info
Each timing source shares a common set of values processed by the strategy in order to
decide how to discipline the virtual clock of the device.
By clicking on the tabs Timing > General the user will be able to quickly get an overview of
the state of all timing sources.The figure below shows the parameters related to the
primary (#1) timing source.
Figure 5-10: Info for Timing Source #1
The parameters contained in the previous table are described as follows:
OID Name Value Description
3.13x0.x
tsrc_info/x/xxx Information about the x timing source.
3.13x0.1 Name <String> (i.e., wr0,
front-panel, eth1,
etc.)
Name of the corresponding timing source.
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CHAPTER 5 • WR-Z16 User Manual Rev. v3.4
5.2 General Timing Management
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