PTP Version 2 (TC) (MS20/MS30, PowerMICE, MACH 104, MACH 1040)

In strongly cascaded networks in particular, the transparent clock (TC) introduced in PTP Version 2 provides a noticeable increase in precision.
The combination with the P2P runtime mechanism (simultaneous runtime measurement at all ports) enables “seamless” reconfiguration.

For the MS20, MS30 and PowerMICE devices with MM23 or MM33 modules:

The following settings enable you to also use the TC for Unicast PTP messages:

You select the PTP version you will use in the Time:PTP:Global dialog.

PTP Version 2 (TC), Global Settings

Tab. PTP Version 2(TC) Profile Presets

Parameters

Meaning

Possible values

Default setting

Profile

Defines relevant PTP parameters to a specific profile.

E2E-Defaults

P2P-Defaults

Power-Defaults


Tab. Function IEEE 1588 / PTPv2 TC

Parameters

Meaning

Possible values

Default setting

Runtime Measuring Mechanism

Mechanism for measuring the message runtime. Enter the same mechanism for the PTP device connected to this port.

A PTP slave port measures the runtime of the entire transmission path to the master. The device displays the measured value in the PTP:Version 2(BC):Global dialog (refer Global).

E2E (end-to-end):

The device itself measures the runtime to all the PTP devices connected. If a reconfiguration is performed, this eliminates the need to determine the runtime again.

P2P (peer-to-peer)

For the MACH 104 and MACH 1040 devices:
Such as E2E with the following characteristics:

  • The device only transmits the PTP slaves' delay queries to the master, even though these queries are multicast frames.
    In this way, the device relieves the other clients from unnecessary multicast queries.

  • With changes in the PTP master-slave topology, the device relearns the port for the PTP master as soon as it has received a frame from another PTP master.

  • If the device does not recognize a PTP master, it also floods delay queries received in the E2E Optimized mode.

E2E Optimized (end-to-end, optimized)

For the MACH 104 and MACH 1040 devices:
The device does not allow runtime measurement, i.e., it discards frames received, which are used for measuring runtime.

Disabled

Primary Domain

Assignment of the clock to a PTPv2 domain.

0-225

0

Network Protocol

Network protocol for P2P and management messages.

UDP/IPv4, IEEE 802.3

UDP/IPv4

Syntonize

Synchronize frequency.

On

Off

For the MS20, MS30 and PowerMICE devices: Off

For devices MACH 104 and MACH 1040: On

Synchronizing local time

The device synchronizes its local time with the time received via the PTP.
Prerequisite: the Syntonize setting is activated.

On

Off

Off

PTP Management

Activate/deactivate PTP management.

To reduce the load on the device, deactivate PTP Management and Syntonize
- at high synchronization rates and
- in Unicast mode.

On

Off

Off

Multi Domain Mode

On: TC corrects messages from all domains.

Off: TC only corrects messages from the primary domain.

On

Off

Off

Power TLV Check

Activate/deactivate the Power TLV check.

On: The device ignores announce messages without the Power Profile TLV.

On

Off

Off

VLAN

The VLAN ID with which the device sends its own frames (like PTP Management frames or P2P frames) to this port.

Note:
  • Also take the port's VLAN setting (refer VLAN Static) into account here, in particular whether the VLAN exists and if the the port is a tagged or untagged member in the VLAN.
  • none: The device always sends PTP frames absent a VLAN tag, even if the port is a tagged member of the VLAN.
  • You can select VLANs that you have already set up using of the table row drop-down list.

none, 0 - 4042

none

VLAN Priority

The VLAN priority (Layer 2, IEEE 802.1p) with which the device sends tagged PTP frames.
If you have set the VLAN ID to none, the device ignores the VLAN priority.

0 - 7

0


Tab. Status IEEE 1588 / PTPv2 TC

Parameters

Meaning

Possible values

Default setting

Clock identifier

Device UUID of the TC (transparent clock)

 

Current master

When the Syntonize function is enabled, the master's port UUID, with which the device synchronizes its frequency, is displayed.
A value consisting of zeros means that:

  • the Syntonize function is deactivated or

  • the device has not found a master


Note: PTPv2 uses as the device UUID 64 bits, consisting of the device's MAC address, between whose No. 3 and No. 4 bytes the values ff and fe are added.
A port UUID consists of the device UUID followed by a 16-bit port ID.
The device displays UUIDs as a byte sequence in hexadecimal notation.

Buttons

Tab. Buttons

Button

Meaning

“Set”

Transfers the changes to the volatile memory (RAM) of the device. To permanently save the changes, open the Basic Settings:Load/Save dialog, select the location to save the configuration, and click “Save”.

“Reload”

Updates the fields with the values that are saved in the volatile memory (RAM) of the device.

“Help”

Opens the online help.


PTP Version 2 (TC), Port Settings

Tab. Port Dialog Version 2(TC)

Parameters

Meaning

Possible values

Default setting

Module

Module number
for modular devices, otherwise 1.

Port

Port to which this entry applies.

If the device does not support the PTP mode selected, the table is empty.

PTP enable

Port sends/receives PTP synchronization messages

on

on

Port blocks PTP synchronization messages. The device does not process any PTP messages it receives at this port.

off

P2P Runtime Measuring Interval

Interval for peer-to-peer runtime measurements at this port.

Prerequisite:
You have selected the P2P runtime measuring mechanism on the device itself and on the PTP device connected.

P2P Runtime

Measured P2P (peer-to-peer) runtime.

Prerequisite:
You have selected the P2P runtime measuring mechanism.

Asymmetry

Correction of the runtime asymmetry in ns. A runtime measurement value of x ns corrupted by asymmetrical transmission values corresponds to an asymmetry of x∙2 ns


Buttons

Tab. Buttons

Button

Meaning

“Set”

Transfers the changes to the volatile memory (RAM) of the device. To permanently save the changes, open the Basic Settings:Load/Save dialog, select the location to save the configuration, and click “Save”.

“Reload”

Updates the fields with the values that are saved in the volatile memory (RAM) of the device.

“Help”

Opens the online help.