Table of Contents
Advertisement
Local time inaccuracy
[ns]
Network time inaccuracy
[ns]
7.2.2.3 Parent tab
The Parent tab displays information about the current grandmaster clock of the network/domain in
which the OTMC 100 operates. If the OTMC 100 is currently the master of the network or domain, the
values given here are identical to the values in the Default tab (see page 45) . Otherwise, information
about the respective grandmaster clock is given here. The data corresponds to the Parent Dataset
specified by IEEE 1588-2008, clause 8.2.3.
Port identity
GM identity
GM clock class
GM clock accuracy
GM clock variance
Displays the maximum time inaccuracy in ns that the device contributes
to the network time inaccuracy. See IEEE C37.238-2011, clause 5.13.
Only available for Power Profile (OTMC 100p only).
This parameter is set in the PTP configuration (see page 67) .
Displays the network time inaccuracy in ns to be transmitted in
IEEE C37.238 TLV. See IEEE C37.238-2011, clause 5.13. Only available
for Power Profile (OTMC 100p only).
This parameter is set in the PTP configuration (see page 67) .
Displays the port identity. This parameter states the port identity of the
OTMC 100 as defined by IEEE 1588-2008, clause 7.5.2, in the format
portNumber@clockIdentity.
Displays the grandmaster identity. This is the unique identifier of the
clock that is currently the grandmaster clock of the network or domain
in which the OTMC 100 participates.
Displays the grandmaster clock class. This parameter specifies the
current clock class of the current grandmaster clock in the network or
domain (see IEEE 1588-2008, clause 7.6.2.4). The value of the GM
clock class parameter is automatically set by the current grandmaster
clock depending on the source of time that is currently available.
Displays the current accuracy of the internal clock of the current
grandmaster clock with regard to TAI. See IEEE 1588-2008, clause
7.6.2.5 for details.
Displays the grandmaster clock variance. The GM clock variance
parameter is set to the PTP variance value specified by IEEE
1588-2008, clause 7.6.3. This parameter gives a measure for the
stability of the internal oscillator of the current grandmaster clock and is
used in the Best Master Clock Algorithm (BMCA) of the PTP protocol.
The OTMC 100 Web Interface
47
Advertisement
Table of Contents
