Nokia 7210 SAS-M User Manual

System Management
290
7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
3HE 16132 AAAB TQZZA Edition: 01
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 PTP End-to-End Transparent Clock
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 Table 31 for a list of platforms that support
this functionality.
A CLI option is provided to enable the PTP port-based hardware timestamp on ports
that receive and forward PTP messages. To enable the TC function, PTP must not
be enabled on the node. When the timestamp option is enabled, the node identifies
standards-based messages and updates the CF for PTP IP/UDP multicast and
unicast messages, and for the PTP Ethernet multicast and unicast messages. The
CF is updated for the residence time of the PTP message. Downstream PTP slaves
that receive the PTP message use the updated CF to measure the delay between
the master and themselves.
You can enable the TC option by running the configure>port>ethernet>ptp-hw-
timestamp command on ports (both ingress and egress) on which residence time in
the PTP message must be updated when the message is in transit through the node.
You can disable the residence time update by running the no form of the command
on both ingress and egress ports, as required. No additional CLI commands are
required to enable the PTP TC option.
Nokia recommends the following operational guidelines and examples for enabling
and using the PTP TC feature.
• Assume port 1/1/10 is connected to a PTP master clock (using a port, a SAP, or
an IES IP interface) and 1/1/15 is connected to a PTP slave clock (using a port,
a SAP, or an IES IP interface).
To enable PTP TC in this scenario, you must enable the ptp-hw-timestamp
command on both ports. To disable PTP TC, run the no form of the command
on both ports.
Note: This feature is supported only on the 7210 SAS-Sx 1/10GE and 7210 SAS-Sx 10/
100GE.

Nokia 7210 SAS-M Specifications

General

Brand	Nokia
Model	7210 SAS-M
Category	Cell Phone
Language	English