Performance Considerations; Ptp End-To-End Transparent Clock - Nokia 7210 Configuration Manual

7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
Logical Model for Using PTP/1588 for Network Synchronization on 7210 SAS
Figure 29
Platforms
Frequency
recovered
from 1588
message
exchange
1588
1588 Slave
messages
Ports
6.5.8.2
Although IEEE 1588v2 can be used on a network that is not PTP-aware, the use of
PTP-aware network elements (boundary clocks) within the packet switched network
improves synchronization performance by reducing the impact of PDV between the
grand master clock and the slave clock. In particular, when IEEE 1588v2 is used to
distribute high-accuracy time, such as for mobile base station phase requirements,
the network architecture requires the deployment of PTP awareness in every device
between the grandmaster and the mobile base station slave.
In addition, performance is also improved by the removal of any PDV caused by
internal queuing within the boundary clock or slave clock. This is accomplished with
hardware that is capable of port-based timestamping, which detects and timestamps
the IEEE 1588v2 packets at the Ethernet interface.
6.5.8.3
Note: This feature is supported only on the 7210 SAS-Sx 1/10GE and 7210 SAS-Sx 10/
100GE.
The 7210 SAS devices support PTP end-to-end (E2E) Transparent Clock (TC)
functionality, which allows the node to update the PTP correction fields (CFs) for the
residence time of the PTP message. See
this functionality.
3HE 17358 AAAB TQZZA
ref1 & ref2
ref1 allowed
ref2 only in PTP
hybrid mode
ptp
Periodic Time
offset calculated
from 1588 message
exchange

Performance Considerations

PTP End-to-End Transparent Clock

Use subject to Terms available at: www.nokia.com
Central Clock
Frequency
Module (EEC)
Nodal reference (TO)
Timestamps
based on central
Central Clock
clock frequency
Time Module
and offset
Table 31
© 2021 Nokia.
System Management
TO to ports
1588 Master 1588
messages
Ports
sw0455
for a list of platforms that support
291