Siemens RUGGEDCOM ROS v5.0 User Manual page 116

Chapter 5
Setup and Configuration
Parameter
Class Of Service
Transport Protocol
Startup Wait
Desired Clock Accuracy
Network Class
1 Step Master Clock
3. Click Apply.
Section 5.1.3.2
Configuring an Ordinary Clock
To configure settings for a PTP ordinary clock, do the following:
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Description
Default: Power Profile
Selects the PTP (Precision Time Protocol) clock profile. PTP profile represents a set of
allowed PTP features applicable to specific industry.
NOTE
Power Profile represents C37.238.2011.
NOTE
Utility Profile Level 1 represents IEC/IEEE 61850-9-3 Ed.1.
Synopsis: 1 to 7 or { Disable }
Default: 4
Selects the PTP (Precision Time Protocol) message priority based on the IEEE 802.1p
specification. IEEE 802.1p defines eight different classes of service, usually expressed
using the 3-bit priority field in an IEEE 802.1Q header added to the Ethernet frame.
Synopsis: { Layer 2 Multicast, Layer 3 Multicast }
Default: Layer 2 Multicast
Selects network transport protocol for PTP (Precision Time Protocol) messages.
Synopsis: 0 to 3600 s
Default: 10 s
Normally the start-up time of a non-GPS master clock is less than that of a GPS-enabled
master (i.e. by the time it takes to acquire GPS lock). This parameter provides the ability
to bootstrap the PTP network in an orderly fashion.
Synopsis: { 50 ns, 100 ns, 250 ns, 1 us, 2.5 us, 10 us, 25 us, 100 us, 250 us, 1 ms, 2.5
ms, 10 ms, 25 ms, 100 ms, 250 ms }
Default: 1 us
This parameter allows the user to configure the desired clock accuracy. This represents
the instantaneous value of the time offset between master and slave clocks. The system
will generate an alarm if the time offset from the master exceeds the desired accuracy.
Synopsis: { IEEE1588 network, Non-IEEE1588 network }
Default: IEEE1588 network
Clock servo stability is highly dependent on network personality. This parameter allows
the user to configure a network personality to reflect a particular network environment.
This might mean, for example, whether all devices in the timing plane are IEEE1588
aware (IEEE1588 network) or whether the timing plane includes non-IEEE1588 devices
as well (non-IEEE1588 network). Note that a IEEE1588 network is independent of traffic
load. Only the E2E mechanism is applicable to non-IEEE1588 networks.
Synopsis: { No, Yes }
Default: Yes
This parameter is specific to the Ordinary Clock type. It allows the user to configure 1-
step or 2-step master clock functionality.
RUGGEDCOM ROS
User Guide
Configuring an Ordinary Clock